«Результаты эксплуатации водоочистной станции в Вашингтоне, округ Колумбия»

Figure 8—Diagrammatic Sketch Showing Arrangements for Testing "Puech" System of Water Filtration at Washington D. C., U. S. A.

Слой чистого песка восстановил первоначальную производительность, и фильтр эксплуатировался как прежде, но со снижающимися скоростями до декабря 1908 года, когда скорость была уменьшена примерно до 40 000 000 галлонов. Даже эта более низкая скорость оказалась слишком высокой для поддержания без удаления и замены большой части песка. Поэтому скорости постепенно снизились примерно до 23 000 000 галлонов к 13 марта 1909 года, когда фильтр снова засыпали песком. После этой повторной засыпки скорость была снижена примерно до 20 000 000 галлонов, и фильтр эксплуатировался приблизительно с такой скоростью до очередной пересыпки песком 13 ноября 1909 года, когда скорость снова уменьшили примерно до 14 000 000 галлонов; этот показатель поддерживался до вывода фильтра из эксплуатации 28 февраля 1910 года.

Эта экспериментальная станция находилась в работе с сентября 1908 года по конец февраля 1910 года, то есть около 1,5 лет, и основные результаты сведены в Таблицу 20.

Table 17—Record of Experimental Filter Plant No. 1.

Date. Preliminary Filter. Final Filter. Turbidity. Bacteria.

Rate, millions of gallons per acre daily. Loss of head. Rate, millions of gallons per acre daily. Loss of head. Applied water. Effluent preliminary filter. Effluent final filter. Applied water. Effluent preliminary filter. Effluent final filter.

1907.

Feb. 8 19.40 0.71 3.10 0.17 ... ... ... 1,100 2,000 2,500

Feb. 9 21.50 0.81 3.11 0.16 ... ... ... 200 950 500

Feb. 10 20.60 0.95 3.04 0.14 ... ... ... ... ... ...

Feb. 11 20.10 1.08 3.03 0.12 12 3 2 600 900 1,300

Feb. 12 19.80 1.23 3.02 0.13 14 4 2 650 650 650

Feb. 13 19.50 1.38 2.96 0.12 15 6 2 600 600 950

Feb. 14 21.20 1.67 3.21 0.11 15 4 2 650 700 800

Feb. 15 25.40 2.03 3.90 0.13 12 4 2 600 550 800

Feb. 16 25.00 2.23 3.89 0.12 14 3 2 850 550 500

Feb. 17 Shut down for changes in size of meter and piping.

Feb. 18 ... ... ... ... ... ... ... 1,200 ... 650

Feb. 21 38.60 1.59 3.93 0.18 20 4 2 1,800 1,100 700

Feb. 22 38.00 1.84 3.92 0.15 15 3 2 Holiday.

Feb. 23 42.10 2.36 3.95 0.14 20 5 2 1,600 600 220

Feb. 24 47.90 3.04 3.93 0.13 20 6 3 Sunday.

Feb. 25 Shut down change meter from outlet to inlet. 1,400 800 450

Feb. 27 ... 2.24 ... 0.13 17 6 3 700 550 280

Feb. 28 49.80 2.55 3.90 0.13 15 6 3 800 470 230

Mar. 1 50.00 2.90 3.93 0.13 15 5 3 650 450 140

Mar. 2 50.20 3.21 3.93 0.13 15 5 3 1,000 650 200

Mar. 3 38.80 3.09 3.89 0.13 31 8 3 Sunday.

Mar. 4 50.00 3.54 3.93 0.12 35 10 5 1,200 ... ...

Mar. 5 50.00 4.01 3.90 0.13 135 39 8 13,000 3,700 600

Mar. 6 50.00 4.82 3.90 0.13 135 39 8 18,000 4,500 ...

Mar. 7 50.00 5.89 3.90 0.13 102 34 6 24,000 5,000 2,000

Mar. 8 50.00 6.58 3.90 0.13 100 25 4 22,000 5,000 1,400

Mar. 9 50.00 7.21 3.93 0.13 90 25 4 24,000 4,000 650

Mar. 10 50.00 7.52 3.90 0.13 82 22 5 Sunday.

Washed.

Mar. 11 50.00 0.84 3.90 0.13 68 19 6 18,000 2,100 350

Mar. 12 50.00 0.95 3.96 0.13 46 19 4 11,000 6,000 310

Mar. 13 50.00 1.17 3.99 0.13 40 19 4 9,000 4,900 300

Mar. 14 50.00 1.53 4.01 0.13 39 17 4 5,500 1,300 130

Mar. 15 50.00 2.27 4.05 0.13 35 15 4 6,500 1,500 60

Mar. 16 50.00 3.08 4.03 0.13 60 20 4 5,000 1,200 100

Mar. 17 50.00 4.26 4.03 0.13 135 35 4 Sunday.

Mar. 18 50.00 5.65 4.00 0.13 170 49 7 9,000 1,200 95

Mar. 19 50.00 7.02 4.01 0.13 125 37 6 7,000 600 100

Washed.

Mar. 20 50.00 1.08 3.98 0.13 102 30 5 4,800 300 75

Mar. 21 50.00 1.23 3.98 0.12 125 32 4 8,500 1,000 85

Mar. 22 50.00 1.46 4.00 0.13 190 65 4 7,500 1,100 45

Mar. 23 50.00 1.76 3.99 0.13 180 65 6 7,500 600 55

Mar. 24 50.00 2.11 3.99 0.12 140 52 7 Sunday.

Mar. 25 50.00 2.46 4.00 0.11 88 30 5 4,400 500 85

Mar. 26 50.00 2.75 4.00 0.12 62 22 4 3,600 300 65

Mar. 27 50.00 3.04 4.08 0.13 47 18 4 2,200 160 60

Mar. 28 50.00 3.38 3.94 0.11 35 10 3 1,300 100 55

Mar. 29 50.00 3.70 4.00 0.11 26 8 3 700 80 29

Mar. 30 50.00 4.42 4.00 0.11 25 6 3 310 70 35

Mar. 31 50.00 5.25 3.99 0.11 21 5 2 Sunday.

Apr. 1 50.00 6.14 4.00 0.12 20 5 2 600 25 30

Washed.

Apr. 2 50.00 2.10 4.00 0.12 24 5 2 270 28 32

Apr. 3 50.00 3.00 4.00 0.12 24 5 2 460 26 43

Apr. 4 50.00 4.01 4.00 0.12 20 5 2 280 20 26

Apr. 5 50.00 5.15 4.00 0.12 20 4 2 450 37 41

Washed.

Apr. 6 50.00 O.76 3.59 0.12 20 4 2 320 6 34

Apr. 7 50.00 O.99 3.47 0.12 20 4 2 Sunday.

Apr. 8 50.00 1.39 4.03 0.14 18 3 2 330 10 20

Apr. 9 50.00 2.04 4.01 0.13 18 3 2 140 9 35

Apr. 10 50.00 3.03 4.02 0.13 30 2 1 750 43 29

Apr. 11 50.00 4.45 4.02 0.14 66 1 1 4,000 900 26

Apr. 12 50.00 6.14 4.01 0.13 72 11 2 14,000 1700 41

Washed.

Apr. 13 50.00 0.95 4.00 0.14 80 21 2 13,000 1300 70

Apr. 14 50.00 1.18 4.00 0.13 77 25 3 Sunday.

Apr. 15 50.00 1.57 4.00 0.14 62 21 3 7,000 380 55

Apr. 16 50.00 2.33 4.00 0.15 47 20 3 3,600 160 33

Apr. 17 50.00 3.33 4.00 0.15 39 15 2 1,600 70 39

Apr. 18 50.00 4.81 4.00 0.16 30 10 2 1,810 130 34

Apr. 19 50.00 6.29 3.99 0.16 25 7 2 790 50 32

Washed.

Apr. 20 50.00 0.93 4.01 0.16 20 5 2 540 24 28

Apr. 21 50.00 1.36 3.97 0.16 20 3 2 Sunday.

Apr. 22 50.00 2.22 4.02 0.16 18 2 1 235 15 28

Apr. 23 50.00 3.33 3.99 0.14 15 2 1 170 14 16

Apr. 24 50.00 4.78 3.97 0.15 19 1 1 150 32 14

Apr. 25 50.00 6.43 3.90 0.15 34 1 1 700 20 18

Washed.

Apr. 26 50.00 O.97 3.97 0.14 46 2 1 1,200 16 16

Apr. 27 50.00 2.37 4.00 0.14 52 3 1 1,700 25 17

Apr. 28 50.00 5.33 3.99 0.14 45 4 1 Sunday.

Washed.

Apr. 29 50.00 0.81 3.99 0.14 44 5 1 600 16 17

Apr. 30 50.00 1.75 3.99 0.14 39 6 1 550 27 12

May 1 50.00 0.80 3.99 0.14 31 5 1 500 24 11

Washed.

May 2 50.00 1.13 4.00 0.14 24 4 1 500 12 16

May 3 50.00 2.09 4.00 0.14 19 3 1 280 30 25

May 4 50.00 3.80 4.00 0.14 16 2 1 400 20 12

May 5 50.00 5.38 4.00 0.14 15 1 1 Sunday.

Washed.

May 6 50.00 0.91 3.90 0.14 13 1 1 390 50 40

May 7 50.00 1.56 3.90 0.14 12 1 1 190 19 80

May 8 50.00 2.25 3.99 0.14 10 1 1 ... ... ...

May 9 50.00 3.37 4.00 0.14 10 1 1 390 21 38

May 10 50.00 5.16 4.00 0.14 10 1 1 300 14 13

Washed.

May 11 50.00 1.03 4.00 0.14 12 1 1 390 13 12

May 12 50.00 1.89 4.00 0.14 17 1 1 Sunday.

May 13 50.00 3.82 4.00 0.14 35 2 1 600 33 15

May 14 50.00 6.31 4.00 0.14 39 3 1 500 27 7

Washed.

May 15 50.00 0.85 4.00 0.14 17 2 1 500 20 29

May 16 50.00 1.42 3.99 0.14 24 2 1 290 19 40

May 17 50.00 2.47 3.99 0.14 18 2 1 260 19 16

May 18 50.00 4.31 4.00 0.13 15 1 1 190 16 20

Washed.

May 19 50.00 0.83 3.99 0.13 12 1 1 Sunday.

May 20 50.00 1.66 4.00 0.13 12 1 1 260 17 41

May 21 50.00 3.83 4.00 0.13 16 1 1 260 26 25

Washed.

May 22 50.00 0.82 3.99 0.13 20 1 1 280 16 19

May 23 50.00 1.64 4.00 0.13 15 1 1 130 20 22

May 24 50.00 3.85 4.00 0.13 15 1 1 170 17 32

Washed.

May 25 50.00 0.84 4.00 0.13 15 1 1 340 25 55

May 26 50.00 1.67 3.99 0.13 18 1 1 Sunday.

May 27 50.00 3.03 4.00 0.13 13 1 1 210 10 40

Washed.

May 28 50.00 0.87 4.01 0.13 16 1 1 260 26 55

May 29 50.00 1.43 4.01 0.13 16 1 1 500 19 50

May 30 50.00 2.55 4.00 0.13 14 1 1 Holiday.

May 31 50.00 4.19 4.00 0.13 17 1 1 380 22 50

June 1 50.00 6.26 3.99 0.13 15 1 1 900 27 50

Washed.

June 2 50.00 0.78 3.98 0.13 17 1 1 Sunday.

June 3 50.00 1.19 4.00 0.13 24 1 1 550 41 50

June 4 50.00 2.15 4.00 0.13 37 2 1 6,500 150 60

June 5 50.00 3.67 4.01 0.13 65 4 1 3,200 150 46

June 6 50.00 6.06 4.00 0.14 77 12 1 1,500 60 27

Washed.

June 7 50.00 0.86 4.00 0.14 64 19 1 2,100 68 45

June 8 50.00 1.41 4.00 0.14 46 16 1 600 35 44

June 9 50.00 2.62 4.01 0.14 44 12 1 Sunday.

June 10 50.00 4.79 4.00 0.14 36 8 1 240 31 35

Washed.

June 11 50.00 0.77 4.00 0.14 30 6 1 280 47 47

June 12 50.00 1.20 4.01 0.14 34 6 1 330 70 55

June 13 50.00 2.42 4.00 0.14 35 8 1 480 43 75

June 14 50.00 4.44 4.00 0.15 31 7 1 440 55 45

Washed.

June 15 50.00 0.80 3.99 0.15 32 6 1 420 17 34

June 16 50.00 1.15 4.00 0.15 26 5 1 Sunday.

June 17 50.00 2.15 3.99 0.14 26 5 1 340 55 37

June 18 50.00 4.36 4.00 0.14 31 6 1 440 14 140

Washed.

June 19 50.00 0.79 4.01 0.15 37 8 1 500 70 24

June 20 50.00 1.19 4.00 0.15 30 7 1 330 49 27

June 21 50.00 2.65 3.98 0.14 25 5 1 170 30 18

June 22 50.00 5.58 4.00 0.14 20 4 1 100 18 13

Washed.

June 23 50.00 0.85 3.62 0.13 26 3 1 Sunday.

June 24 50.00 2.02 3.99 0.13 140 11 1 1,700 27 36

June 25 50.00 4.77 3.99 0.13 130 26 1 400 70 23

Washed.

June 26 50.00 0.73 4.01 0.13 82 27 1 750 200 41

June 27 50.00 1.17 4.01 0.13 65 18 1 ... ... ...

June 28 50.00 3.10 3.99 0.13 47 16 1 ... 20 ...

Washed.

June 29 50.00 0.67 3.99 0.13 37 7 1 220 35 29

June 30 50.00 1.02 4.00 0.13 30 6 1 Sunday.

July 1 50.00 2.70 3.99 0.13 30 6 1 400 46 3

Washed.

July 2 50.00 0.69 4.00 0.13 32 7 1 180 80 38

July 3 50.00 1.21 3.99 0.13 36 8 1 350 70 90

July 4 50.00 3.40 3.99 0.13 44 10 1 Holiday.

Washed.

July 5 50.00 0.77 3.99 0.13 44 11 1 550 180 34

July 6 50.00 1.19 4.01 0.13 39 10 1 250 60 26

July 7 50.00 3.72 3.99 0.13 34 8 1 Sunday.

Washed.

July 8 50.00 0.78 3.97 0.13 25 5 1 220 31 21

July 9 50.00 1.27 3.98 0.13 22 4 1 50 10 9

July 10 50.00 3.11 4.09 0.13 47 9 1 Lost.

Washed.

July 11 50.00 0.83 3.99 0.13 90 19 1 150 19 8

July 12 50.00 1.47 3.99 0.13 97 25 1 300 40 23

July 13 50.00 3.61 4.00 0.13 96 29 1 220 47 16

Washed.

July 14 50.00 0.84 3.99 0.13 90 30 1 Sunday.

July 15 50.00 1.30 4.00 0.13 95 30 1 375 55 21

July 16 50.00 2.72 3.99 0.14 120 35 1 Lost. 90 13

July 17 50.00 5.08 3.99 0.14 85 32 1 270 2 11

Washed.

July 18 50.00 0.85 3.99 0.14 56 22 1 1,675 70 50

July 19 50.00 1.43 4.00 0.14 41 12 1 450 95 22

July 20 50.00 3.23 3.99 0.14 62 19 1 300 38 11

Washed.

July 21 50.00 0.80 3.99 0.14 62 21 1 Sunday.

July 22 50.00 1.06 3.98 0.14 80 26 1 1,400 150 7

July 23 50.00 2.18 3.99 0.14 105 30 1 3,700 Lost. 11

July 24 50.00 4.95 3.98 0.15 95 30 1 770 Lost. 22

Washed.

July 25 50.00 0.84 3.98 0.15 77 22 1 250 33 11

July 26 50.00 1.22 3.98 0.15 67 19 1 140 100 4

July 27 50.00 2.36 4.00 0.16 54 15 1 300 95 7

July 28 50.00 4.74 3.98 0.16 46 12 1 Sunday.

Washed.

July 29 50.00 0.83 3.99 0.17 36 10 1 470 110 18

July 30 50.00 1.02 4.00 0.17 29 7 1 Plates lost.

July 31 50.00 1.66 4.00 0.17 21 5 1 Plates lost.

Aug. 1 48.20 2.95 4.00 0.17 16 4 1 Plateslost.

Aug. 2 46.40 4.96 4.00 0.17 15 2 1 130 42 13

Washed.

Aug. 3 42.60 0.79 4.00 0.17 16 1 1 120 4 16

Aug. 4 49.10 0.91 4.00 0.17 21 1 1 Sunday.

Aug. 5 49.10 1.59 4.00 0.17 29 1 1 230 160 11

Aug. 6 48.20 3.16 4.00 0.17 34 2 1 85 200 12

Aug. 7 45.60 5.65 3.99 0.17 21 2 1 200 Lost 4

Washed.

Aug. 8 50.00 0.80 3.99 0.17 19 2 1 100 70 11

Aug. 9 49.10 0.94 4.00 0.17 16 1 1 75 44 9

Aug. 10 48.20 1.51 4.00 0.17 24 1 1 60 13 6

Aug. 11 48.20 3.32 4.00 0.17 62 3 1 Sunday.

Washed.

Aug. 12 41.90 0.83 3.99 0.17 120 14 1 620 110 5

Aug. 13 49.10 1.14 3.99 0.17 107 29 1 820 53 36

Aug. 14 49.10 1.72 4.00 0.18 82 30 1 850 160 110

Aug. 15 48.20 3.30 4.00 0.18 65 22 1 150 37 4

Aug. 16 46.40 0.84 4.00 0.19 45 15 1 270 110 13

Aug. 17 48.20 1.05 4.00 0.19 35 10 1 340 110 6

Aug. 18 50.00 1.54 4.00 0.19 21 5 1 Sunday.

Aug. 19 49.10 2.29 4.00 0.19 18 4 1 180 85 13

Aug. 20 49.10 3.74 3.99 0.19 20 2 1 210 85 8

Washed.

Aug. 21 44.10 1.01 3.98 0.19 20 2 1 1300 115 9

Aug. 22 45.60 1.86 4.00 0.19 27 2 1 3800 265 1

Aug. 23 47.30 4.08 3.99 0.19 49 2 1 2500 70 13

Washed.

Aug. 24 41.30 1.29 3.97 0.19 36 6 1 3900 46 6

Aug. 25 44.10 2.11 3.98 0.20 34 7 1 Sunday.

Aug. 26 48.20 3.42 3.99 0.20 21 5 1 700 140 0

Aug. 27 48.20 5.10 4.00 0.20 19 4 1 470 100 4

Washed.

Aug. 28 46.40 1.28 4.00 0.20 18 3 1 500 49 3

Aug. 29 41.90 1.90 4.02 0.20 17 2 1 360 80 0

Aug. 30 45.60 3.23 4.00 0.20 15 1 1 320 190 1

Aug. 31 46.40 4.57 4.00 0.20 13 1 1 200 20 3

Sept. 1 50.00 5.17 3.65 0.20 14 1 1 Sunday.

Sept. 2 48.20 5.97 4.00 0.20 12 1 1 Holiday.

Washed.

Sept. 3 47.30 1.13 4.00 0.20 12 1 1 300 9 1

Sept. 4 48.20 2.01 4.00 0.20 16 1 1 600 60 2

Sept. 5 46.40 5.41 3.67 0.20 34 1 0 360 72 ...

Washed.

Sept. 6 40.60 1.42 3.98 0.20 160 12 0 15000 140 0

Sept. 7 42.60 5.19 3.99 0.20 64 18 1 2000 130 1

Washed.

Sept. 8 42.60 1.25 4.00 0.20 56 18 1 Sunday.

Sept. 9 46.40 3.07 4.00 0.22 59 18 1 220 80 4

Washed.

Sept. 10 45.60 1.02 3.99 0.23 57 16 1 18000 57 8

Sept. 11 48.20 2.36 4.00 0.23 65 18 1 2700 90 1

Washed.

Sept. 12 44.10 1.14 3.99 0.24 72 18 1 1000 47 4

Sept. 13 46.40 3.61 3.99 0.25 87 20 1 2300 77 5

Washed.

Sept. 14 38.20 1.42 3.97 0.26 72 19 1 2400 80 5

Sept. 15 45.60 4.27 4.00 0.27 65 18 1 Sunday.

Washed.

Sept. 16 40.00 1.06 3.99 0.28 65 18 1 Lost. 22 Lost.

Sept. 17 46.40 2.48 4.01 0.28 52 16 1 420 75 1

Washed.

Sept. 18 46.40 1.11 4.00 0.28 60 13 1 900 37 3

Sept. 19 46.40 2.76 4.00 0.28 85 16 1 2000 186 0

Washed.

Sept. 20 44.10 1.12 4.00 0.31 100 19 1 4200 110 7

Sept. 21 48.20 2.07 3.99 0.33 120 24 1 1100 110 3

Washed.

Sept. 22 44.10 1.30 3.67 0.34 137 29 1 Sunday.

Sept. 23 45.60 3.79 3.99 0.39 112 25 1 2400 50 2

Washed.

Sept. 24 45.60 1.15 3.97 0.40 100 25 1 4000 69 4

Sept. 25 48.20 2.06 4.00 0.42 432 53 1 56000 680 0

Sept. 26 Stopped, unable to wash preliminary.

Sept. 28 50.00 1.74 4.00 0.71 127 35 1 ... ... 37

Washed.

Sept. 29 44.10 2.85 3.99 0.82 105 31 1 Sunday.

Sept. 30 44.90 3.78 3.97 1.04 115 32 1 Lost. Lost. 160

Washed.

Oct. 1 44.10 1.20 3.98 1.34 82 26 1 600 180 55

Oct. 2 49.10 3.22 3.97 1.54 65 19 1 4,400 120 5

Washed.

Oct. 3 44.10 1.31 3.97 1.56 59 17 1 900 55 10

Oct. 4 49.10 2.97 3.97 1.65 55 15 1 850 60 6

Washed.

Oct. 5 44.90 1.31 3.98 1.75 59 16 1 2,000 110 38

Oct. 6 46.40 3.65 3.99 1.89 59 17 1 Sunday.

Washed.

Oct. 7 44.90 1.34 3.98 1.99 52 13 1 1,250 70 15

Oct. 8 49.10 3.49 3.98 2.17 54 13 1 11,000 65 6

Washed.

Oct. 9 44.10 1.20 3.97 2.33 51 13 1 2,000 85 4

Oct. 10 49.10 2.22 3.98 2.55 50 12 1 800 36 10

Oct. 11 46.40 4.59 4.00 2.51 47 11 1 2,000 57 10

Oct. 12 Shut off to remove sand in preliminary filter in order to clean out the under-drains.

Nov. 5 50.00 1.38 3.97 3.49 185 50 1 ... ... ...

Nov. 6 48.20 3.25 3.98 3.79 170 52 1 5,000 1,500 240

Washed.

Nov. 7 45.60 1.18 3.98 4.05 100 35 1 14,000 1,000 220

Nov. 8 48.20 4.08 3.99 4.37 95 32 1 1,900 270 160

Nov. 9 42.00 6.58 3.98 4.39 80 27 1 4,000 500 190

Nov. 10 Shut down for scraping. Removed 266,000 cu. cm. of sand.

Nov. 12 50.00 0.98 3.99 0.25 40 10 1 ... ... ...

Nov. 13 50.00 1.51 4.00 0.22 36 8 1 1,600 750 85

Nov. 14 48.20 2.60 4.00 0.21 42 11 1 2,700 700 210

Nov. 15 47.30 3.80 4.00 0.20 35 9 1 1,800 350 180

Nov. 16 47.30 4.87 4.00 0.19 26 5 1 1,100 200 34

Nov. 17 50.00 5.75 4.00 0.19 20 4 1 Sunday.

Nov. 18 50.00 6.41 4.00 0.19 17 3 1 1,600 290 55

Washed.

Nov. 19 48.20 1.06 3.99 0.20 16 2 1 1,300 480 60

Nov. 20 48.20 2.05 3.99 0.20 45 3 1 6,500 3,700 800

Nov. 21 48.20 3.48 3.99 0.20 52 9 1 9,900 4,000 300

Nov. 22 47.30 4.85 3.99 0.20 65 17 1 10,000 1,000 380

Nov. 23 48.20 6.11 3.99 0.20 49 15 1 18,000 1,000 320

Washed.

Nov. 24 46.40 3.71 3.98 0.20 134 24 1 Sunday.

Nov. 25 Shut down for fear of washing preliminary with such muddy water.

Nov. 29 50.00 1.55 4.00 0.21 80 25 1 ... ... ...

Nov. 30 47.30 3.14 3.98 0.22 54 16 1 3,800 950 160

Dec. 1 47.30 4.48 3.98 0.23 37 10 1 Sunday.

Dec. 2 47.30 5.63 3.98 0.25 36 6 1 2,900 550 90

Washed.

Dec. 3 46.40 0.98 3.99 0.25 29 6 1 2,900 480 75

Dec. 4 50.00 1.15 3.99 0.26 20 4 1 2,000 270 70

Dec. 5 50.00 1.48 4.00 0.25 18 3 1 1,100 270 50

Dec. 6 48.20 2.04 3.63 0.25 16 2 1 3,000 ... ...

Dec. 7 48.20 2.80 4.00 0.26 14 1 1 2,400 190 10

Dec. 8 50.00 3.40 3.72 0.27 12 1 1 Sunday.

Dec. 9 49.10 3.93 4.00 0.27 11 1 1 1,200 170 7

Dec. 10 49.10 4.50 4.00 0.27 12 1 1 800 90 55

Dec. 11 48.20 5.52 4.00 0.27 255 44 1 6,500 --- ---

Dec. 12 Shut down 12/11 at 6 P.M. turbidity too high to wash.

Dec. 15 --- --- --- --- --- --- --- Sunday.

Dec. 16 50.00 4.02 3.99 0.28 90 35 2 --- --- ---

Washed.

Dec. 17 40.00 1.90 3.97 0.30 70 25 2 21,000 10,000 1,200

Washed.

Dec. 18 44.10 1.08 3.97 0.31 49 15 2 6,500 4,200 800

Dec. 19 48.20 1.88 3.98 0.31 39 10 1 Lost. Lost. Lost.

Dec. 20 46.40 4.77 3.99 0.31 42 13 1 Lost. Lost. Lost.

Dec. 21 46.40 6.68 3.99 0.32 26 6 1 Lost. Lost. Lost.

Washed.

Dec. 22 49.10 1.14 3.99 0.32 20 4 1 Sunday.

Dec. 23 49.10 2.17 4.00 0.31 34 7 1 1,400 300 100

Dec. 24 49.10 3.76 4.00 0.31 195 56 1 9,000 950 70

Dec. 25 Shut down 12/24 at 9 P.M. turbidity too high to wash. Holiday.

Dec. 30 50.00 2.61 3.97 0.33 56 19 2 --- --- ---

Dec. 31 44.80 5.57 3.98 0.36 39 12 1 --- --- ---

Washed.

1908.

Jan. 1 46.40 1.30 3.98 0.36 31 6 1 Holiday.

Jan. 2 48.20 3.36 4.00 0.36 39 9 1 --- --- ---

Jan. 3 47.30 4.95 3.99 0.35 36 9 1 3,100 490 90

Jan. 4 50.00 5.28 3.99 0.35 32 7 1 2,400 240 43

Jan. 5 49.10 6.26 4.00 0.35 26 5 1 Sunday.

Washed.

Jan. 6 49.10 0.99 3.98 0.35 20 4 1 600 200 37

Jan. 7 50.00 1.15 4.00 0.35 20 4 1 1,100 150 47

Jan. 8 50.00 1.41 4.00 0.35 22 4 1 1,900 160 30

Jan. 9 49.10 1.92 4.00 0.35 45 11 1 13,000 1,300 70

Jan. 10 49.10 2.56 4.00 0.36 70 25 1 10,000 3,500 170

Jan. 11 50.00 3.17 3.99 0.37 56 18 1 16,000 4,000 240

Jan. 12 49.10 3.73 4.00 0.37 40 10 1 Sunday.

Jan. 13 50.00 4.14 4.00 0.37 110 45 2 8,500 1,200 840

Jan. 14 49.10 4.65 3.99 0.38 210 95 3 16,000 3,900 500

Jan. 15 49.10 5.23 3.99 0.41 325 190 12 24,000 7,000 550

Jan. 16 50.00 5.75 3.99 0.43 360 210 37 28,000 8,500 1,200

Jan. 17 49.10 6.34 4.00 0.45 242 122 24 65,000 15,000 1,700

Jan. 18 --- --- --- --- --- --- --- --- --- ---

Jan. 19 50.00 1.17 4.00 0.46 117 40 12 Sunday.

Jan. 20 50.00 1.38 4.00 0.46 72 31 6 1,600 1,800 320

Jan. 21 50.00 1.68 3.57 0.37 55 20 4 5,000 450

Jan. 22 49.10 2.04 4.00 0.44 49 17 3 3,600 600 100

Jan. 23 50.00 2.47 3.24 0.33 40 12 3 1,800 290 130

Jan. 24 49.10 3.03 3.00 0.34 40 11 2 2,300 270 65

Jan. 25 50.00 3.61 3.00 0.35 39 10 2 1,100 180 60

Jan. 26 49.10 4.18 2.99 0.35 32 7 2 Sunday.

Jan. 27 50.00 4.81 3.00 0.35 32 7 2 300 40 24

Jan. 28 48.20 5.45 2.99 0.35 45 12 2 1,200 90 31

Jan. 29 49.10 6.01 2.99 0.35 60 21 2 1,000 230 50

Jan. 30 49.10 6.62 2.99 0.36 57 22 2 1,400 170 48

Washed.

Jan. 31 50.00 1.30 2.99 0.36 42 15 2 1,100 190 23

Feb. 1 50.00 1.51 2.99 0.37 39 11 2 750 40 31

Feb. 2 50.00 1.78 3.00 0.37 27 7 2 Sunday.

Feb. 3 49.10 2.13 3.00 0.37 29 6 2 1,300 200 7

Feb. 4 50.00 2.69 3.00 0.37 25 5 1 600 160 18

Feb. 5 49.10 3.31 2.99 0.37 24 5 1 750 140 41

Feb. 6 50.00 3.89 2.99 0.37 20 4 1 2,000 180 29

Feb. 7 48.20 4.50 2.99 0.37 17 3 1 ... 38 15

Feb. 8 49.10 5.11 2.99 0.37 15 3 1 900 95 24

Feb. 9 49.10 5.65 3.00 0.38 14 3 1 Sunday.

Feb. 10 49.10 6.43 2.99 0.38 11 3 1 850 85 21

Feb. 11 50.00 6.90 3.00 0.38 10 3 1 1,000 70 20

Washed.

Feb. 12 49.10 1.29 2.99 0.38 8 2 1 750 20 16

Feb. 13 50.00 1.50 2.99 0.39 9 2 1 700 40 11

Feb. 14 50.00 1.80 2.99 0.39 9 2 1 1,200 39 7

Feb. 15 49.10 2.35 3.00 0.39 61 13 1 5,500 600 7

Feb. 16 49.10 3.28 2.99 0.39 80 30 2 Sunday.

Feb. 17 48.20 4.85 2.99 0.39 80 29 3 33,000 3,800 130

Feb. 18 47.30 6.39 2.99 0.39 130 44 3 --- 2,600 160

Feb. 19 45.50 7.32 2.98 0.40 320 143 6 28,000 6,000 180

Washed.

Feb. 22 50.00 1.40 3.00 0.41 85 30 5 Holiday.

Feb. 23 50.00 1.77 3.00 0.41 60 21 4 Sunday.

Feb. 24 49.10 2.25 2.99 0.41 46 14 3 3,600 2,800 90

Feb. 25 50.00 2.61 3.00 0.41 31 7 2 2,300 140 47

Feb. 26 50.00 3.06 3.00 0.41 30 6 2 3,800 140 45

Feb. 27 48.20 3.65 2.99 0.41 30 5 1 1,300 100 22

Feb. 28 50.00 4.24 3.00 0.41 37 6 1 1,400 100 40

Feb. 29 48.20 5.28 2.99 0.41 123 52 2 13,500 420 40

Washed.

Mar. 1 44.60 1.56 2.99 0.42 97 39 5 Sunday.

Mar. 2 48.20 2.90 2.99 0.42 82 30 4 8,000 320 60

Mar. 3 46.40 4.69 2.98 0.42 87 33 4 11,000 750 30

Mar. 4 47.30 6.13 2.99 0.42 67 24 3 6,000 290 34

Mar. 5 48.20 7.31 2.99 0.42 59 19 3 4,400 220 41

Washed.

Mar. 6 49.10 1.53 2.99 0.42 72 24 2 7,000 170 41

Mar. 7 50.00 1.95 3.00 0.43 82 30 2 9,500 210 34

Mar. 8 49.10 2.62 2.99 0.43 92 37 3 Sunday.

Mar. 9 50.00 3.19 3.00 0.43 125 56 4 11,000 700 65

Mar. 10 Preliminary filter discontinued and the Puech system started.

Table 17—Record of Experimental Filter, Puech system.—(Continued.)

Date. Puech system: Final filter. Turbidity. Bacteria.

Rates, millions of gallons per acre daily. Rate, millions of gallons per acre daily. Loss of head. Applied water. Effluent, preliminary filter. Effluent, final filter. Applied water. Effluent, preliminary filter. Effluent, final filter.

1908.

Mar. 11 265 170 90 53 18 2.99 0.53 155 80 7 6,500 8,500 490

Mar. 12 265 170 90 53 18 2.99 0.60 135 70 7 5,900 6,000 360

Mar. 13 265 170 90 53 18 3.00 0.60 122 52 6 1,900 1,700 140

Mar. 14 265 170 90 53 18 3.00 0.61 97 40 5 1,800 1,600 130

Mar. 15 265 170 90 53 18 2.99 0.64 77 31 4 Sunday.

Mar. 16 265 170 90 53 18 3.00 0.69 65 26 3 1,400 1,200 50

Mar. 17 241 155 82 48 16 2.99 0.71 59 19 3 900 200 45

Mar. 18 252 162 86 50 17 2.99 0.75 67 22 2 1,000 700 33

Mar. 19 241 155 82 48 16 2.99 0.78 60 21 2 ... 800 44

Mar. 20 294 189 100 59 20 2.99 0.85 57 18 2 1,300 650 37

Mar. 21 279 179 95 56 19 2.99 0.92 67 21 2 800 600 34

Mar. 22 265 170 90 53 18 2.99 0.99 80 27 2 Sunday.

Mar. 23 265 170 90 53 18 2.99 1.06 90 32 2 4,600 1,300 33

Mar. 24 265 170 90 53 18 2.99 1.12 82 34 3 2,500 950 38

Mar. 25 265 170 90 53 18 2.99 1.18 67 27 3 1,600 ... 30

Mar. 26 265 170 90 53 18 2.99 1.22 60 20 3 550 400 24

Mar. 27 265 170 90 53 18 3.00 1.23 59 18 2 950 360 28

Mar. 28 265 170 90 53 18 3.00 1.25 51 14 2 650 230 18

Mar. 29 265 170 90 53 18 2.99 1.28 31 6 2 Sunday.

Mar. 30 265 170 90 53 18 2.99 1.36 30 5 1 500 160 25

Mar. 31 265 170 90 53 18 2.99 1.43 39 7 1 750 140 26

April 1 265 170 90 53 18 3.00 1.48 44 9 1 750 60 41

April 2 265 170 90 53 18 2.99 1.56 42 9 1 1,100 140 26

April 3 318 204 108 64 22 2.99 1.63 41 8 1 1,500 47 11

April 4 294 189 100 59 20 2.99 1.70 54 13 1 700 80 35

April 5 279 179 95 56 19 3.00 1.73 50 13 1 Sunday.

April 6 279 179 95 56 19 2.99 1.76 41 9 1 440 65 17

April 7 265 170 90 53 18 3.00 1.78 35 6 1 650 65 34

April 8 265 170 90 53 18 3.00 1.79 39 6 1 550 44 10

April 9 265 170 90 53 18 3.00 1.79 40 6 1 390 30 25

April 10 265 170 90 53 18 3.00 1.77 40 6 1 500 27 16

April 11 265 170 90 53 18 3.00 1.78 45 7 1 430 28 28

April 12 265 170 90 53 18 2.99 1.80 52 11 1 Sunday.

April 13 265 170 90 53 18 ... 1.81 50 10 1 490 17 26

April 14 Shut down on account of losing water when aqueduct was drained; also cleaned coarse sand filter. Started April 22d.

April 23 241 155 82 48 16 ... 1.82 29 4 1 140 600 38

April 24 241 155 82 48 16 3.00 1.87 21 3 1 200 1,000 13

April 25 241 155 82 48 16 2.99 1.95 20 3 1 85 180 25

April 26 252 162 86 50 17 3.00 1.95 24 3 1 Sunday.

April 27 241 155 82 48 16 3.00 1.93 18 2 1 95 35 23

April 28 241 155 82 48 16 3.00 1.96 20 2 1 70 24 18

April 29 241 155 82 48 16 2.99 1.97 24 3 1 110 21 24

April 30 241 155 82 48 16 2.99 2.03 21 2 1 70 25 6

May 1 241 155 82 48 16 3.00 2.07 32 4 1 130 20 18

May 2 241 155 82 48 16 2.99 2.12 26 3 1 140 16 12

May 3 241 155 82 48 16 2.99 2.17 22 3 1 Sunday.

May 4 241 155 82 48 16 3.00 2.19 19 2 1 85 30 17

May 5 241 155 82 48 16 3.00 2.20 18 2 1 130 33 9

May 6 241 155 82 48 16 2.99 2.23 18 2 1 230 55 6

May 7 252 162 86 50 17 3.00 2.24 19 2 1 160 75 10

May 8 241 155 82 48 16 3.00 2.25 19 2 1 375 55 8

May 9 318 204 108 64 22 2.99 2.29 18 2 1 1,200 12 9

May 10 318 204 108 64 22 2.99 2.30 30 3 1 Sunday.

May 11 265 170 90 53 18 2.99 2.33 60 10 1 2,800 130 11

May 12 252 162 86 50 17 2.99 2.39 70 15 1 2,900 135 9

May 13 241 155 82 48 16 3.00 2.41 66 14 1 1,800 110 16

May 14 265 170 90 53 18 3.00 2.38 45 7 1 2,700 65 18

May 15 252 162 86 50 17 3.00 2.41 39 5 1 950 45 14

May 16 241 155 82 48 16 3.00 2.41 49 7 1 800 32 10

May 17 241 155 82 48 16 3.01 2.34 46 7 1 Sunday.

May 18 241 155 82 48 16 3.00 2.31 31 4 1 700 26 6

May 19 252 162 86 50 17 3.00 2.26 36 4 1 375 28 17

May 20 252 162 86 50 17 3.00 2.20 41 5 1 425 38 11

May 21 344 221 117 69 23 3.00 2.18 30 3 1 300 25 9

May 22 241 155 82 48 16 3.01 2.17 53 7 1 950 220 18

May 23 265 170 90 53 18 2.99 2.25 127 38 1 2,400 600 21

May 24 331 212 112 66 22 3.00 2.19 110 39 3 Sunday.

May 25 318 204 108 64 22 3.01 2.02 90 25 3 600 300 40

May 26 279 179 95 56 19 3.02 1.87 135 45 3 3,200 110 34

May 27 265 170 90 53 18 3.01 1.63 110 39 3 14,500 320 45

May 28 252 162 86 50 17 3.01 1.41 90 27 3 1,000 95 28

May 29 252 162 86 50 17 3.01 1.24 70 17 3 1,100 150 26

May 30 252 162 86 50 17 3.01 1.07 50 9 2 Holiday.

May 31 241 155 82 48 16 3.01 1.03 34 4 2 Sunday.

June 1 252 162 86 50 17 3.00 0.83 35 4 1 ... ... ...

June 2 241 155 82 48 16 3.00 0.74 39 5 1 ... ... ...

June 3 252 162 86 50 17 3.00 0.68 35 4 1 ... ... ...

June 4 241 155 82 48 16 3.00 0.63 30 3 1 ... ... ...

June 5 252 162 86 50 17 2.99 0.60 30 3 1 ... ... ...

June 6 241 155 82 48 16 3.00 0.56 27 3 1 ... ... ...

June 7 241 155 82 48 16 2.99 0.53 22 2 1 ... ... ...

June 8 241 155 82 48 16 3.00 0.49 20 1 1 ... ... ...

June 9 241 155 82 48 16 2.99 0.46 20 1 1 ... ... ...

June 10 241 155 82 48 16 3.00 0.44 17 1 1 ... ... ...

June 11 331 212 112 66 22 2.98 0.42 12 1 1 ... ... ...

June 12 318 204 108 64 22 2.98 0.42 11 1 1 ... ... ...

June 13 265 170 90 53 18 3.00 0.40 36 3 1 ... ... ...

June 14 252 162 86 50 17 2.99 0.40 39 5 1 ... ... ...

June 15 241 155 82 48 16 2.99 0.39 25 3 1 ... ... ...

June 16 241 155 82 48 16 2.99 0.40 34 3 1 ... ... ...

June 17 252 162 86 50 17 2.99 0.41 64 11 1 ... ... ...

June 18 241 155 82 48 16 2.99 0.42 57 11 1 ... ... ...

June 19 241 155 82 48 16 2.99 0.42 46 8 1 ... ... ...

June 20 241 155 82 48 16 2.99 0.42 40 5 1 ... ... ...

June 21 241 155 82 48 16 3.00 0.43 28 4 1 ... ... ...

June 22 241 155 82 48 16 2.99 0.43 25 3 1 ... ... ...

June 23 241 155 82 48 16 2.99 0.43 25 3 1 ... ... ...

June 24 241 155 82 48 16 2.99 0.43 29 4 1 ... ... ...

June 25 241 155 82 48 16 2.99 0.43 18 2 1 ... ... ...

June 26 241 155 82 48 16 2.80 0.42 15 1 1 ... ... ...

June 27 241 155 82 48 16 2.99 0.44 12 1 1 ... ... ...

June 28 241 155 82 48 16 2.99 0.44 9 1 1 ... ... ...

June 29 241 155 82 48 16 2.99 0.44 8 1 1 ... ... ...

June 30 241 155 82 48 16 2.99 0.44 10 1 1 ... ... ...

July 1 241 155 82 48 16 3.00 0.45 8 1 1 80 10 4

July 2 241 155 82 48 16 3.00 0.46 8 1 0 290 24 5

July 3 241 155 82 48 16 3.00 0.47 8 1 0 350 45 6

July 4 241 155 82 48 16 2.99 0.49 9 1 0 ... ... ...

July 5 305 195 103 61 21 3.00 0.51 10 1 0 ... ... ...

July 6 241 155 82 48 16 3.00 0.51 9 1 0 300 36 7

July 7 241 155 82 48 16 2.99 0.53 8 1 0 110 10 3

July 8 252 162 86 50 17 3.00 0.53 9 1 0 85 22 2

July 9 241 155 82 48 16 3.00 0.54 8 1 0 85 26 2

July 10 ... ... ... ... ... ... ... ... ... ... 200 3 5

July 11 305 195 103 61 21 3.00 0.56 12 1 0 145 7 3

July 12 241 155 82 48 16 2.99 0.58 11 1 0 ... ... ...

July 13 241 155 82 48 16 3.00 0.60 10 1 0 115 34 55

July 14 241 155 82 48 16 2.99 0.62 16 1 0 300 55 30

July 15 241 155 82 48 16 2.99 0.64 17 1 0 180 32 23

July 16 241 155 82 48 16 3.00 0.67 13 1 0 100 115 3

July 17 241 155 82 48 16 2.99 0.71 10 1 0 65 275 5

July 18 241 155 82 48 16 2.99 0.73 11 1 0 38 425 10

July 19 241 155 82 48 16 3.00 0.76 12 1 0 ... ... ...

July 20 241 155 82 48 16 2.99 0.79 10 1 0 95 90 70

July 21 252 162 86 50 17 2.99 0.83 10 1 1 70 17 4

July 22 241 155 82 48 16 2.99 0.87 13 1 1 440 8 5

July 23 305 195 103 61 21 2.99 0.92 54 4 1 650 26 5

July 24 331 212 111 66 22 2.98 0.99 305 61 1 1,650 ... ...

July 25 265 170 90 53 18 2.98 1.08 330 85 1 2,600 115 15

July 26 252 162 86 50 17 2.98 1.21 290 77 2 ... ... ...

July 27 305 195 103 61 21 2.98 1.40 335 87 2 35,000 250 ...

July 28 252 162 86 50 17 2.98 1.68 170 52 2 1,200 1,350 15

July 29 252 162 86 50 17 2.97 2.14 180 52 2 2,000 600 13

July 30 252 162 86 50 17 2.97 2.65 237 56 2 800 1,300 12

July 31 241 155 82 48 16 2.95 3.01 250 60 2 1,000 310 7

Table 18—Record of Experimental Filter Plant No. 2.

Date. Preliminary Filter. Final Filter. Turbidity Bacteria

Rate, millions of gallons per acre daily. Loss of head. Rate, millions of gallons per acre daily. Loss of head. Applied water. Effluent preliminary filter. Effluent final filter. Applied water. Effluent preliminary filter. Effluent final filter.

1907.

Feb. 8 21.50 0.04 2.81 0.17 ... ... ... 1,100 2,100 ...

Feb. 9 21.60 0.04 1.09 0.06 ... ... ... 200 550 2,100

Feb. 10 20.90 0.05 1.59 0.08 ... ... ... ... ... ...

Feb. 11 19.80 0.05 3.01 0.15 12 6 2 600 1,160 1,100

Feb. 12 19.70 0.06 3.01 0.14 12 5 2 650 400 700

Feb. 13 19.60 0.06 3.01 0.12 15 5 2 660 900 700

Feb. 14 24.70 0.07 2.65 0.13 15 6 2 650 1,100 900

Feb. 15 37.20 ... 3.40 0.12 12 5 2 600 800 850

Feb. 16 37.30 ... 3.40 0.11 14 4 2 850 950 600

Feb. 17 Shut down for changes in meters and piping.

Feb. 18 ... ... ... ... ... ... ... 1,200 ... 600

Feb. 21 44.50 ... 4.36 0.19 20 6 2 1,800 1,400 800

Feb. 22 48.60 ... 4.37 0.16 15 4 2 Holiday.

Feb. 23 48.40 ... 4.20 0.15 20 7 2 1,600 750 380

Feb. 24 48.30 ... 4.02 0.13 20 10 3 Sunday.

Feb. 25 Shut down several hours. 0.14 20 10 3 1,400 1,000 450

Feb. 26 48.60 0.04 4.12 0.14 20 10 3 700 800 260

Feb. 27 53.20 0.04 4.08 0.15 17 8 3 700 700 290

Feb. 28 52.80 0.04 4.09 0.15 15 8 3 800 650 500

Mar. 1 53.00 0.04 4.10 0.16 15 8 3 650 550 200

Mar. 2 53.30 0.04 4.11 0.16 15 7 3 1,000 800 300

Mar. 3 50.60 0.05 4.11 0.16 31 11 3 Sunday.

Mar. 4 42.40 0.05 4.12 0.17 35 15 6 1,200 1,500 360

Mar. 5 42.70 0.05 4.11 0.17 135 52 10 13,000 850 ...

Mar. 6 48.60 0.07 4.13 0.17 135 54 12 18,000 8,000 ...

Mar. 7 50.50 0.08 4.12 0.18 102 46 8 24,000 6,500 1,800

Mar. 8 51.80 0.09 4.12 0.18 100 40 6 22,000 6,000 1,600

Mar. 9 53.00 0.10 4.12 0.18 90 40 5 24,000 6,000 800

Mar. 10 54.40 0.12 4.11 0.19 82 39 6 Sunday.

Mar. 11 51.00 0.12 4.12 0.19 68 32 7 18,000 4,300 240

Mar. 12 51.20 0.12 4.07 0.19 46 25 5 11,000 4,600 210

Mar. 13 50.50 0.12 4.00 0.19 40 20 5 9,000 1,500 200

Mar. 14 46.50 0.12 ... 0.20 39 20 4 5,500 1,200 90

Mar. 15 45.80 0.12 3.98 0.20 35 18 4 6,500 1,100 150

Mar. 16 42.50 0.12 3.97 0.19 60 24 4 5,000 800 160

Mar. 17 49.30 0.14 3.98 0.19 135 45 5 Sunday.

Mar. 18 52.60 0.16 3.98 0.20 170 59 9 9,000 1,700 100

Mar. 19 53.50 0.17 4.01 0.19 125 51 8 7,000 1,000 120

Mar. 20 52.90 0.17 3.99 0.18 102 40 6 4,800 700 75

Mar. 21 48.20 0.16 4.00 0.19 125 42 5 8,500 1,100 90

Mar. 22 51.80 0.18 4.01 0.20 190 82 5 7,500 1,100 55

Mar. 23 51.60 0.19 4.01 0.20 180 75 6 7,500 1,300 90

Mar. 24 48.20 0.17 4.01 0.20 140 68 7 Sunday.

Mar. 25 48.50 0.18 4.01 0.20 88 40 5 4,400 900 75

Mar. 26 45.90 0.18 3.98 0.20 62 32 4 3,600 750 90

Mar. 27 50.50 0.20 4.04 0.20 47 25 4 2,200 400 60

Mar. 28 49.60 0.20 3.92 0.19 35 16 3 1,300 350 55

Mar. 29 42.20 0.17 3.98 0.19 26 12 3 700 180 20

Mar. 30 48.00 0.22 4.01 0.19 25 7 3 310 220 39

Mar. 31 49.10 0.22 3.99 0.20 21 6 2 Sunday.

April 1 49.10 0.24 4.00 0.20 20 6 2 600 110 38

April 2 49.70 0.25 4.00 0.20 24 6 2 270 110 29

April 3 51.40 0.27 4.00 0.21 24 6 2 460 85 31

April 4 48.70 0.27 4.00 0.22 20 6 2 280 60 22

April 5 48.10 0.27 4.00 0.22 20 5 2 450 70 40

April 6 Shut down awaiting Mr. Maiguen to apply bone-charcoal.

April 7 Removed 1.06 in. of sand. Sunday.

April 8 52.20 0.33 4.05 0.27 18 4 3 330 ... ...

April 9 46.90 0.29 4.02 0.29 18 4 2 140 60 32

April 10 47.60 0.31 4.03 0.28 30 4 1 750 120 28

April 11 46.00 0.30 4.04 0.28 66 7 2 4,000 ... 32

April 12 45.40 0.31 4.03 0.29 72 20 3 14,000 2,900 85

April 13 45.10 0.32 3.99 0.32 80 30 3 13,000 2,500 95

April 14 49.00 0.34 4.00 0.32 77 35 4 Sunday.

April 15 47.80 0.35 3.99 0.33 62 31 4 7,000 1,100 60

April 16 47.40 0.36 3.99 0.34 47 27 4 3,600 650 31

April 17 45.60 0.36 4.00 0.34 39 21 3 1,600 160 38

April 18 45.70 0.36 4.00 0.34 30 13 2 1,810 210 42

April 19 45.60 0.37 4.00 0.34 25 9 2 790 190 34

April 20 45.30 0.40 4.00 0.36 20 6 2 540 87 23

April 21 47.20 0.44 3.99 0.38 20 4 2 Sunday.

April 22 45.20 0.42 3.99 0.38 18 3 1 235 55 22

April 23 44.90 0.44 4.05 0.40 15 3 1 170 45 16

April 24 40.50 0.41 4.02 0.44 19 2 1 150 14 14

April 25 39.60 0.41 4.03 0.45 34 3 1 700 12 23

April 26 40.70 0.44 4.05 0.45 46 4 1 1,200 80 16

April 27 39.30 0.44 4.00 0.44 52 4 1 1,700 160 23

April 28 34.70 0.43 4.05 0.44 45 5 1 Sunday.

April 29 37.20 0.45 4.00 0.42 44 6 1 600 60 10

April 30 43.00 0.49 4.00 0.41 39 7 1 550 55 15

May 1 41.30 0.49 4.00 0.41 31 6 1 500 80 17

May 2 42.40 0.49 4.00 0.41 24 5 1 500 80 19

May 3 40.70 0.48 4.00 0.40 19 4 1 280 75 48

May 4 33.80 0.47 4.00 0.39 16 3 1 400 80 9

May 5 26.20 0.43 4.00 0.39 15 1 1 Sunday.

May 6 29.00 0.38 3.99 0.37 13 2 1 390 100 65

May 7 27.60 0.36 ... 0.37 12 2 1 190 60 19

May 8 24.70 0.31 3.99 0.37 10 2 1 ... ... ...

Washed.

May 9 24.40 0.03 3.98 0.39 10 2 1 390 65 10

May 10 24.80 0.04 4.00 0.42 10 2 1 300 80 18

May 11 50.00 0.06 4.00 0.44 12 2 1 390 110 12

May 12 50.00 0.08 4.00 0.48 17 2 1 Sunday.

May 13 50.00 0.09 4.00 0.47 35 3 1 600 100 18

May 14 50.00 0.10 4.00 0.46 39 4 1 500 65 15

May 15 48.50 0.15 4.00 0.45 17 3 1 500 70 16

May 16 47.00 0.16 4.00 0.46 24 3 1 290 70 16

May 17 47.00 0.16 3.99 0.47 18 3 1 260 40 9

May 18 47.00 0.19 4.00 0.48 15 2 1 190 ... 17

May 19 47.00 0.21 3.99 0.51 12 2 1 Sunday.

May 20 46.60 0.24 4.00 0.53 12 2 1 260 40 13

May 21 46.40 0.24 4.00 0.55 16 2 1 260 65 9

May 22 46.40 0.27 4.00 0.58 20 2 1 280 35 12

May 23 46.40 0.29 4.00 0.61 15 2 1 130 35 10

May 24 46.40 0.30 4.00 0.63 15 2 1 170 26 6

May 25 46.40 0.32 4.00 0.66 15 2 1 340 80 13

May 26 46.40 0.34 3.99 0.70 18 2 1 Sunday.

May 27 46.40 0.86 3.99 0.74 13 2 1 210 80 7

May 28 46.40 0.38 3.15 0.76 16 2 1 260 70 10

May 29 46.00 0.44 3.88 0.78 16 2 1 500 55 12

May 30 45.60 0.46 3.99 0.86 14 2 1 Holiday.

May 31 45.60 0.46 4.00 0.92 17 2 1 380 65 11

June 1 45.60 0.46 4.00 0.98 15 2 1 900 48 10

June 2 45.60 0.48 4.00 1.09 17 2 1 Sunday.

June 3 45.60 0.51 4.00 1.20 24 2 1 550 75 16

June 4 45.60 0.54 4.00 1.32 37 3 1 6,500 ... 22

June 5 45.60 0.55 4.00 1.48 65 5 1 3,200 140 19

June 6 45.60 0.56 4.01 3.66 77 16 1 1,500 210 14

June 7 45.00 0.57 4.00 1.80 64 27 1 2,100 230 20

June 8 45.00 0.57 4.00 1.90 46 22 1 600 240 33

June 9 45.00 0.55 4.01 2.00 44 18 1 Sunday.

June 10 45.00 0.56 4.00 2.09 36 12 1 240 110 43

June 11 45.00 0.58 4.00 2.17 30 8 1 280 130 60

June 12 45.00 0.60 4.01 2.27 34 8 1 330 150 60

June 13 45.00 0.62 4.00 2.36 35 10 1 480 ... 120

June 14 45.00 0.63 3.99 2.49 31 9 1 440 ... 65

June 15 45.00 0.64 3.99 2.56 32 8 1 420 ... 49

June 16 44.70 0.65 4.00 2.63 26 7 1 Sunday.

June 17 44.40 0.64 4.00 2.67 26 6 1 340 270 55

June 18 45.00 0.63 3.98 2.69 31 7 1 440 140 65

June 19 45.00 0.63 4.00 2.73 37 10 1 500 110 24

June 20 45.00 0.62 4.01 2.72 30 9 1 330 70 34

June 21 45.00 0.61 4.01 2.68 25 7 1 170 130 60

June 22 Shut down to scrape and apply asbestos and coke; removed 0.79 in. of sand.

June 23 Applied 8 lb. of asbestos and 10 lb. of bone-charcoal.

June 25 50.00 0.54 4.00 0.27 130 45 1 400 ... ...

June 26 50.00 0.57 4.01 0.46 82 37 1 750 550 35

June 27 50.00 0.63 4.01 0.55 65 26 1 ... 1,200 140

June 28 50.00 0.65 3.99 0.63 47 21 1 ... 1,200 26

June 29 50.00 0.70 4.00 0.73 37 9 1 220 800 22

June 30 50.00 0.77 3.99 0.82 30 8 1 Sunday.

July 1 50.00 0.87 4.00 0.80 30 8 1 400 90 37

July 2 50.00 0.95 4.01 0.73 32 9 1 180 230 25

July 3 50.00 1.01 4.00 0.66 36 10 1 350 80 58

July 4 50.00 1.03 4.00 0.58 44 12 1 Holiday.

July 5 50.00 1.07 3.99 0.54 24 14 1 550 130 47

July 6 50.00 1.10 4.00 0.52 39 12 1 250 110 33

July 7 50.00 1.14 4.00 0.50 34 10 1 Sunday.

July 8 50.00 1.16 4.00 0.48 25 7 1 220 190 14

July 9 50.00 1.18 4.00 0.46 22 5 1 50 30 3

July 10 50.00 1.20 3.99 0.45 47 11 1 Lost. Lost. Lost.

July 11 50.00 1.20 3.99 0.45 90 30 1 150 140 12

July 12 50.00 1.20 4.01 0.44 97 35 1 300 110 20

July 13 50.00 1.15 4.00 0.47 90 39 1 220 120 14

July 14 50.00 1.15 4.00 0.48 90 40 1 Sunday.

July 15 50.00 1.14 3.99 0.48 95 40 1 375 320 19

July 16 50.00 1.19 4.00 0.48 120 45 1 Lost. 150 12

July 17 50.00 1.21 4.00 0.48 85 42 1 270 60 5

July 18 50.00 1.19 3.99 0.50 56 32 1 1,675 23 39

July 19 50.00 1.16 3.99 0.52 41 20 1 450 200 13

July 20 50.00 1.16 3.99 0.56 62 29 1 300 220 8

July 21 50.00 1.19 3.99 0.63 62 31 1 Sunday.

July 22 50.00 1.20 3.99 0.77 80 36 1 1,400 70 9

July 23 50.00 1.21 3.99 0.93 105 40 1 3,700 370 25

July 24 50.00 1.38 3.99 1.07 95 40 1 770 260 31

July 25 50.00 1.17 3.99 1.22 77 32 1 250 230 3

July 26 50.00 1.07 4.00 1.37 67 29 1 140 90 12

July 27 50.00 1.11 4.00 54 25 1 300 180 6

July 28 50.00 1.22 3.98 1.65 46 19 1 Sunday.

July 29 50.00 1.21 4.00 1.82 36 16 1 470 230 18

July 30 50.00 1.20 3.99 1.98 29 11 1 Plates lost.

July 31 50.00 1.20 3.99 2.11 21 9 1 Plates lost.

Aug. 1 51.00 1.21 3.99 2.27 16 6 1 Plates lost.

Aug. 2 51.00 1.21 3.99 2.43 15 4 1 130 130 4

Aug. 3 51.00 1.21 4.00 2.66 16 3 1 120 80 4

Aug. 4 50.00 1.21 3.99 2.95 21 3 1 Sunday.

Aug. 5 50.00 1.21 3.98 3.22 29 3 1 230 210 4

Aug. 6 50.00 1.22 3.98 3.50 34 4 1 85 320 19

Aug. 7 50.00 1.21 3.99 3.74 21 4 1 200 Lost. 19

Aug. 8 48.20 1.20 ... 4.09 19 4 1 100 150 17

Aug. 9 50.00 1.18 ... 4.45 16 3 1 75 220 9

Aug. 10 47.30 1.16 ... 4.67 24 3 1 60 250 10

Aug. 11 Shut down to drain and scrape sand filter; O.9 in. depth over all.

Aug. 16 Out of service all the rest of month washing sponge and asbestos.

Sept. 3 50.00 0.02 4.00 0.16 12 5 1 300 ... ...

Sept. 4 50.00 0.02 3.99 0.14 16 6 1 600 260 370

Sept. 5 50.00 0.02 4.01 0.13 34 6 1 360 71 165

Sept. 6 46.40 0.02 4.00 0.12 160 52 1 15,000 1,900 120

Sept. 7 50.00 0.03 4.00 0.11 64 26 1 2,000 170 62

Sept. 8 46.40 0.04 3.99 0.11 56 25 1 Sunday.

Sept. 9 50.00 0.05 4.90 0.11 59 25 1 220 13 19

Sept. 10 50.00 0.05 4.00 0.11 57 21 1 18,000 100 24

Sept. 11 50.00 0.06 4.00 0.11 65 25 1 2,700 150 25

Sept. 12 50.00 0.07 4.00 0.12 72 26 1 1,000 190 36

Sept. 13 50.00 0.08 4.00 0.12 87 30 1 2,300 ... 35

Sept. 14 50.00 0.09 4.01 0.12 72 27 1 2,400 130 230

Sept. 15 48.20 0.11 4.00 0.12 65 25 1 Sunday.

Sept. 16 51.00 0.13 4.00 0.12 65 25 1 Lost. Lost. 27

Sept. 17 50.00 0.14 4.00 0.12 52 21 1 420 60 29

Sept. 18 49.10 0.14 4.00 0.13 60 18 1 900 80 41

Sept. 19 50.00 0.15 4.00 0.13 85 22 1 2,000 ... 19

Sept. 20 49.10 0.17 4.00 0.13 100 29 1 4,200 300 28

Sept. 21 49.10 0.18 4.00 0.13 120 34 1 1,100 160 30

Sept. 22 48.20 0.20 4.00 0.13 137 41 1 Sunday.

Sept. 23 49.10 0.19 4.00 0.13 112 37 1 2,400 90 34

Sept. 24 46.40 0.19 3.99 0.14 100 35 1 4,000 210 12

Sept. 25 46.40 0.20 4.00 0.14 432 80 1 56,000 510 27

Sept. 26 45.60 0.24 4.00 0.15 385 80 4 1,300 450 55

Sept. 27 44.80 0.27 4.00 0.16 245 70 3 4,000 240 41

Sept. 28 46.40 0.30 3.99 0.16 127 46 2 15,000 430 37

Sept. 29 46.40 0.31 3.99 0.16 105 41 2 Sunday.

Sept. 30 46.40 0.31 4.00 0.17 115 42 1 Lost. 1,600 110

Oct. 1 48.20 0.33 4.00 0.18 82 36 1 600 600 120

Oct. 2 50.00 0.33 4.01 0.19 65 27 1 4,400 170 47

Oct. 3 48.20 0.33 4.00 0.19 59 34 1 900 210 44

Oct. 4 48.20 0.34 4.00 0.19 55 20 1 850 200 37

Oct. 5 50.00 0.38 4.00 0.19 9 21 1 2,000 150 34

Oct. 6 48.20 0.41 4.00 0.19 59 24 1 Sunday.

Oct. 7 48.20 0.42 4.00 0.19 552 17 1 1,250 200 28

Oct. 8 50.00 0.42 4.00 0.19 54 16 1 11,000 210 28

Oct. 9 44.80 0.40 4.00 0.19 51 16 1 2,000 310 29

Oct. 10 48.20 0.42 4.00 0.19 50 15 1 800 220 16

Oct. 11 48.20 0.43 4.00 0.20 47 13 1 2,000 310 46

Washed.

Oct. 12 50.00 0.14 4.00 0.20 36 11 1 1,200 370 25

Oct. 13 47.30 0.15 4.00 0.21 40 15 1 Sunday.

Oct. 14 50.00 0.18 4.00 0.22 47 19 1 1,200 390 22

Oct. 15 53.00 0.20 4.00 0.23 41 16 1 900 140 16

Oct. 16 50.00 0.20 4.00 0.24 35 12 1 Lost. 310 18

Oct. 17 50.00 0.21 4.00 0.25 30 8 1 550 180 7

Oct. 18 50.00 0.21 4.00 0.25 25 6 1 260 100 33

Oct. 19 50.00 0.21 4.00 0.25 25 6 1 750 220 15

Oct. 20 50.00 0.22 4.00 0.25 20 5 1 Sunday.

Oct. 21 50.00 0.23 4.00 0.25 19 5 1 480 120 11

Oct. 22 50.00 0.24 4.00 0.26 18 4 1 230 70 7

Oct. 23 50.00 0.25 4.00 0.26 15 3 1 250 120 12

Oct. 24 50.00 0.26 4.00 0.26 15 3 1 300 80 12

Oct. 25 50.00 0.27 4.00 0.27 15 2 1 450 60 15

Oct. 26 50.00 0.28 4.00 0.27 15 2 1 450 Lost. 14

Oct. 27 50.00 0.29 4.00 0.27 13 2 0 Sunday.

Oct. 28 50.00 0.30 4.00 0.27 13 2 0 190 110 9

Oct. 29 50.00 0.31 4.00 0.27 25 2 0 380 ... ...

Oct. 30 50.00 0.32 4.00 0.27 21 3 0 ... ... ...

Oct. 31 Out of commission. 4-in supply pipe stopped up.

Nov. 4 50.00 0.16 4.00 0.28 125 11 1 ... ... ...

Nov. 5 50.00 0.17 4.00 0.28 185 61 1 6,000 3,000 220

Nov. 6 50.00 0.18 4.00 0.29 170 66 1 5,000 1,100 150

Nov. 7 50.00 0.20 4.00 0.30 100 45 1 14,000 1,600 120

Nov. 8 50.00 0.21 4.00 0.32 95 42 1 1,900 2,000 29

Nov. 9 50.00 0.22 4.00 0.34 80 36 1 4,000 2,000 110

Nov. 10 50.00 0.23 4.00 0.36 67 29 1 Sunday.

Nov. 11 50.00 0.24 3.46 0.38 52 20 1 1,900 460 160

Nov. 12 50.00 0.26 3.99 0.40 40 13 1 7,500 1,100 110

Nov. 13 50.00 0.27 4.00 0.44 36 10 1 1,600 550 50

Nov. 14 50.00 0.28 4.00 0.49 42 13 1 2,700 950 48

Nov. 15 50.00 0.29 4.00 0.55 35 11 1 1,800 900 49

Nov. 16 50.00 0.30 4.00 0.65 26 7 1 1,100 360 35

Nov. 17 50.00 0.31 3.98 0.80 20 5 1 Sunday.

Nov. 18 50.00 0.32 3.99 0.98 17 4 1 1,600 200 35

Nov. 19 50.00 0.34 3.99 1.26 16 3 1 1,300 400 55

Nov. 20 50.00 0.35 3.98 1.64 45 4 1 6,500 3,500 200

Nov. 21 50.00 0.36 3.99 2.03 52 12 1 9,900 4,500 130

Nov. 22 50.00 0.37 3.98 2.33 65 24 1 10,000 5,500 220

Nov. 23 50.00 0.38 3.99 2.60 49 19 1 18,000 3,500 100

Nov. 24 50.00 0.40 3.98 2.85 134 32 1 Sunday.

Nov. 25 48.20 0.45 3.98 3.10 225 87 2 50,000 19,000 340

Nov. 26 50.00 0.49 3.98 3.62 237 90 2 40,000 11,000 220

Nov. 27 50.00 0.51 3.99 4.15 185 77 2 16,000 7,500 310

Nov. 28 50.00 0.54 3.84 4.44 130 57 2 Holiday.

Nov. 29 50.00 0.55 3.67 4.55 80 36 1 10,000 2,200 80

Nov. 30 50.00 0.56 3.44 4.65 54 25 1 3,800 2,200 55

Dec. 2 Shut down to scrape sand filter.

Dec. 6 50.00 0.64 4.00 0.46 16 3 1 --- --- ---

Dec. 7 50.00 0.64 4.00 0.39 14 3 1 2,400 1,200 490

Dec. 8 50.00 0.64 4.01 0.35 12 2 1 Sunday.

Dec. 9 50.00 0.65 4.01 0.33 11 2 1 1,200 420 60

Dec. 10 50.00 0.65 4.00 0.33 12 2 1 800 950 66

Dec. 11 47.30 0.64 4.00 0.35 255 84 3 6,500 1,600 140

Dec. 12 46.40 0.70 3.98 0.39 212 100 6 48,000 15,000 1,800

Dec. 13 50.00 0.79 3.98 0.49 495 217 9 42,000 20,000 1,600

Dec. 14 52.00 0.84 3.97 0.65 357 167 9 49,000 9,500 1,200

Dec. 15 49.10 0.84 3.98 0.77 157 76 6 Sunday.

Dec. 16 49.10 0.86 3.97 0.84 90 42 4 19,000 800 700

Dec. 17 49.10 0.88 3.98 0.91 70 31 2 21,000 18,000 1,600

Dec. 18 48.20 0.89 3.98 0.94 49 21 2 6,500 7,000 600

Dec. 19 50.00 0.91 3.98 0.97 39 13 1 Lost. Lost. Lost.

Dec. 20 49.10 0.92 3.98 1.03 42 16 1 " " "

Dec. 21 50.00 0.94 3.98 1.08 26 7 1 " " "

Dec. 22 50.00 0.97 3.98 1.13 20 5 1 Sunday.

Dec. 23 50.00 0.95 3.98 1.19 34 9 1 1,400 500 160

Dec. 24 47.30 0.93 3.98 1.28 195 75 2 9,000 1,700 130

Dec. 25 44.10 0.91 3.97 1.47 445 210 9 Holiday.

Dec. 26 46.40 1.01 3.97 1.63 370 172 7 51,000 8,000 250

Dec. 27 50.00 1.11 3.98 1.81 245 110 5 55,000 5,600 210

Dec. 28 48.20 1.12 3.99 1.87 102 46 3 10,000 4,500 140

Dec. 29 50.00 1.14 3.99 1.85 75 32 2 Sunday.

Dec. 30 49.10 1.15 3.98 1.86 56 24 2 4,400 1,900 190

Dec. 31 50.00 1.17 4.00 1.87 39 15 1 14,000 1,300 60

1908.

Jan. 1 50.00 1.18 3.98 1.90 31 8 1 ... ... ...

Jan. 2 50.00 1.18 3.99 1.94 39 11 1 4,400 750 45

Jan. 3 50.00 1.19 3.98 1.98 36 11 1 3,100 1,600 70

Washed.

Jan. 4 50.00 0.17 3.97 2.09 32 9 1 2,400 1,200 43

Jan. 5 50.00 0.18 3.98 2.22 26 6 1 Sunday.

Jan. 6 50.00 0.19 3.98 2.28 20 5 1 600 600 49

Jan. 7 50.00 0.20 3.98 2.37 20 5 1 1,100 330 49

Jan. 8 50.00 0.21 3.99 2.43 22 5 1 1,900 900 43

Jan. 9 50.00 0.23 3.98 2.52 45 13 1 13,000 3,400 50

Jan. 10 50.00 0.24 3.99 2.66 70 30 1 10,000 8,000 50

Jan. 11 50.00 0.27 3.98 2.74 56 22 1 16,000 220 200

Jan. 12 50.00 0.28 3.98 2.83 40 12 1 Sunday.

Jan. 13 49.10 0.30 3.98 2.93 110 51 2 8,500 1,200 43

Jan. 14 48.20 0.33 3.99 3.04 210 113 4 16,000 6,000 280

Jan. 15 46.40 0.35 3.98 3.21 325 222 15 24,000 9,500 700

Jan. 16 50.00 0.40 3.98 3.49 360 247 42 28,000 14,000 900

Jan. 17 50.00 0.43 3.98 3.86 242 147 26 65,000 20,000 1,200

Jan. 18 50.00 0.46 3.91 3.99 137 73 7 7,000 6,500 400

Jan. 19 ... ... ... ... ... ... ... Sunday.

Jan. 20 Scraped.

Jan. 21 50.00 0.48 3.00 0.76 55 25 4 ... ... ...

Jan. 22 50.00 0.48 3.01 0.60 49 21 4 3,600 1,900 150

Jan. 23 50.00 0.49 3.00 0.57 40 15 3 1,800 700 170

Jan. 24 50.00 0.49 2.99 0.60 40 13 3 2,300 950 90

Jan. 25 50.00 0.50 2.99 0.65 39 12 3 1,100 800 95

Jan. 26 50.00 0.50 2.98 0.69 32 9 2 Sunday.

Jan. 27 50.00 0.51 2.99 0.76 32 9 2 300 700 70

Jan. 28 50.00 0.52 2.99 0.82 45 15 2 1,200 900 70

Jan. 29 50.00 0.55 2.99 0.90 60 26 2 1,000 1,400 95

Jan. 30 50.00 0.57 2.98 0.98 57 27 2 1,400 210 33

Jan. 31 50.00 0.58 2.98 1.08 42 18 2 1,100 750 45

Feb. 1 50.00 0.59 2.99 1.16 39 14 2 750 1,000 70

Feb. 2 49.10 0.60 2.99 1.22 27 9 2 Sunday.

Feb. 3 49.10 0.61 2.98 1.30 29 8 2 1,300 750 20

Feb. 4 50.00 0.64 2.99 1.40 25 6 2 600 900 60

Feb. 5 50.00 0.66 2.99 1.50 24 6 2 750 200 75

Feb. 6 50.00 0.67 2.99 1.55 20 5 2 2,000 800 60

Feb. 7 50.00 0.68 3.00 1.56 17 4 1 ... 600 34

Feb. 8 50.00 0.69 3.00 1.53 15 4 1 900 220 35

Feb. 9 50.00 0.71 3.00 1.54 14 4 1 Sunday.

Feb. 10 50.00 0.72 2.99 1.60 11 4 1 850 500 28

Feb. 11 50.00 0.74 2.99 1.62 10 4 1 1,000 500 23

Feb. 12 50.00 0.75 2.98 1.68 8 4 1 750 290 18

Feb. 13 50.00 0.76 2.99 1.74 9 4 1 700 260 10

Feb. 14 48.20 0.76 2.99 1.77 9 4 1 1,200 250 27

Feb. 15 51.80 0.79 2.99 1.89 61 18 1 5,500 4,800 13

Feb. 16 48.20 0.79 2.99 2.08 80 40 2 Sunday.

Feb. 17 48.20 0.81 2.99 2.24 80 40 3 33,000 1,300 60

Feb. 18 47.30 0.82 2.99 2.31 130 65 3 ... 950 120

Feb. 19 51.80 0.92 2.99 2.45 320 200 7 28,000 22,000 360

Feb. 20 52.70 0.99 2.99 2.61 177 97 9 22,000 16,300 350

Feb. 21 51.80 1.03 2.99 2.68 105 52 6 10,600 3,800 270

Feb. 22 50.90 1.07 2.99 2.72 85 42 5 Holiday.

Feb. 23 50.00 1.09 2.99 2.76 60 30 4 Sunday.

Feb. 24 51.80 1.12 2.99 2.80 46 19 3 3,600 1,700 120

Feb. 25 50.00 1.14 2.99 2.84 31 9 2 2,300 1,300 60

Feb. 26 50.00 1.17 3.00 2.87 30 8 2 3,800 1,300 43

Feb. 27 48.20 1.18 2.99 2.90 30 7 1 1,300 900 42

Feb. 28 47.30 1.19 2.99 2.94 37 7 1 1,400 800 31

Feb. 29 51.80 1.23 2.99 3.01 123 49 2 13,500 750 35

Mar. 1 48.20 1.20 2.98 2.99 97 44 5 Sunday.

Mar. 2 50.00 1.28 2.99 3.12 82 35 4 8,000 2,500 70

Mar. 3 50.90 1.32 2.98 3.22 87 38 4 11,000 6,000 55

Mar. 4 50.00 1.33 2.99 3.28 67 29 3 6,000 1,400 38

Mar. 5 50.00 1.35 2.99 3.32 59 23 3 4,400 2,500 37

Mar. 6 Discontinued; sand filter being used for sedimentation experiments.

Figure 9—Detail of Strainer System.

Table 19—Record of Experimental Filter Plant. No. 3.

Date. Sand Filter. Turbidity. Bacteria. Coagulant.

Rate. Loss of head. Applied water. Effluent, coagulant. Effluent, sand. Applied water. Effluent, coagulant. Effluent, sand. Grains, per gallon.

1907.

Feb. 12 2.99 0.18 14 ... 2 ... ... ... ...

Feb. 13 3.00 0.17 15 ... 2 600 ... ... ...

Feb. 14 3.19 0.18 15 ... 2 650 ... ... ...

Feb. 15 3.86 0.22 12 ... 2 600 ... 2,500 ...

Feb. 16 3.84 0.29 14 ... 2 850 ... 1,600 ...

Feb. 17 ... ... ... ... ... ... ... ... ...

Feb. 18 ... ... ... ... ... 1,200 ... 300 ...

Feb. 21 3.91 0.32 20 ... 2 1,800 ... 550 ...

Feb. 22 3.95 0.39 15 ... 2 2 Holiday.

Feb. 23 3.94 0.43 20 ... 3 1,600 ... 1,100 ...

Feb. 24 3.89 0.47 20 ... 3 3 Sunday.

Feb. 25 4.19 0.52 20 ... 3 1,400 ... 600 ...

Feb. 26 4.13 0.57 20 ... 3 700 ... 650 ...

Feb. 27 3.32 0.62 17 ... 3 700 ... 2,300 ...

Feb. 28 4.41 0.67 15 ... 3 800 ... 550 ...

Mar. 1 3.91 0.72 15 ... 3 650 ... 300 ...

Mar. 2 3.93 0.79 15 ... 3 1,000 ... 270 ...

Mar. 3 3.90 0.82 31 ... 3 Sunday.

Mar. 4 3.92 0.80 35 ... 3 1,200 ... 140 1.45

Mar. 5 3.96 0.98 135 ... 4 13,000 ... 190 1.94

Mar. 6 4.05 1.25 135 29 2 18,000 2,100 160 2.03

Mar. 7 3.95 1.52 102 15 1 24,000 3,500 160 1.50

Mar. 8 3.90 1.67 100 15 1 22,000 1,800 130 1.38

Mar. 9 3.93 1.80 90 15 1 24,000 3,500 130 1.37

Mar. 10 3.95 1.91 82 16 1 Sunday. 1.26

Mar. 11 3.96 2.08 68 18 1 18,000 6,000 120 1.24

Mar. 12 4.02 2.19 46 18 1 11,000 9,000 140 1.08

Mar. 13 4.02 2.31 40 15 1 9,000 5,000 120 0.94

Mar. 14 3.96 2.44 39 16 1 5,500 3,600 90 0

Mar. 15 4.07 2.42 35 20 1 6,500 3,800 85 0

Mar. 16 3.85 2.20 60 29 1 5,000 3,500 100 1.26

Mar. 17 3.95 2.21 135 25 1 Sunday. 1.52

Mar. 18 3.88 2.86 170 25 1 9,000 1,900 85 1.75

Mar. 19 3.82 3.31 125 21 1 7,000 700 65 1.57

Mar. 20 3.78 3.47 102 20 1 4,800 1,500 60 1.31

Mar. 21 3.71 3.70 125 20 1 8,500 1,500 70 1.38

Mar. 22 3.64 3.81 190 25 1 7,500 1,100 35 1.57

Mar. 23 3.58 3.95 180 26 1 7,500 470 55 1.68

Mar. 24 3.46 4.18 140 19 1 Sunday. 1.52

Mar. 25 Scraped, 1.03 in. of sand removed.

Mar. 27 4.06 0.22 47 8 1 2,200 480 60 1.08

Mar. 28 4.02 0.37 35 ... 0 1,300 250 80 1.00

Mar. 29 4.02 0.46 26 ... ... 700 240 65 0

Mar. 30 Shut down to fill coagulant basin.

... ... 25 ... ... 310 ... ... 0

Mar. 31 4.00 0.45 21 15 1 Sunday. 0

Apr. 1 3.39 0.42 20 15 1 600 1,000 43 0

Apr. 2 3.06 0.46 24 17 1 270 Lost. 35 0

Apr. 3 3.01 0.49 24 17 1 460 " 41 0

Apr. 4 2.95 0.50 20 15 1 280 550 27 0

Apr. 5 2.95 0.51 20 13 1 450 1,000 60 0

Apr. 6 2.96 0.49 20 12 1 320 50 35 0

Apr. 7 2.99 0.48 20 12 1 Sunday. 0

Apr. 8 3.01 0.49 18 12 1 330 650 22 0

Apr. 9 3.01 0.55 18 12 1 140 750 21 0

Apr. 10 3.02 0.57 30 15 0 750 5,000 29 0

Apr. 11 3.04 0.61 66 16 0 4,000 550 25 1.11

Apr. 12 3.09 0.72 72 13 0 14,000 2,200 17 1.15

Apr. 13 3.07 0.88 80 19 0 13,000 3,900 25 1.14

Apr. 14 2.98 1.04 77 18 1 Sunday. 1.17

Apr. 15 2.97 1.20 62 18 1 7,060 2,200 19 1.09

Apr. 16 3.01 1.32 47 17 1 3,600 900 22 1.08

Apr. 17 3.05 1.44 39 19 0 1,600 1,100 12 0

Apr. 18 3.04 1.41 30 20 1 1,810 1,870 14 0

Apr. 19 3.04 1.35 25 18 1 790 910 14 0

Apr. 20 3.07 1.30 20 15 1 540 480 15 0

Apr. 21 3.07 1.26 20 15 1 Sunday. ...

Apr. 22 3.04 1.21 18 12 0 235 420 21 0

Apr. 23 3.06 1.22 15 10 0 170 420 8 0

Apr. 24 2.99 1.26 19 10 0 150 250 17 0

Apr. 25 3.04 1.27 34 12 0 700 260 19 0

Apr. 26 3.07 1.28 46 12 0 1,200 320 80 0

Apr. 27 2.94 1.49 52 ... 0 1,700 1,500 70 0

Apr. 28 2.96 1.88 45 ... 1 Sunday. 0

Apr. 29 2.99 2.40 44 33 1 600 1,400 19 0

Apr. 30 3.00 2.83 39 29 1 550 1,200 14 0

May 1 3.01 2.71 31 21 1 500 1,300 20 0

May 2 3.01 2.51 24 15 1 500 850 16 0

May 3 3.00 2.36 19 12 1 280 650 34 0

May 4 3.01 2.29 16 10 0 400 550 24 0

May 5 3.01 2.25 15 9 0 Sunday. 0

May 6 3.06 2.32 13 8 0 390 460 80 0

May 7 2.96 2.46 12 7 0 190 ... 18 0

May 8 3.00 2.51 10 5 0 ... ... ... 0

May 9 3.00 2.77 10 5 0 390 1,100 14 0

May 10 3.01 2.87 10 5 0 300 500 21 0

May 11 2.99 3.16 12 6 0 390 650 16 0

May 12 3.00 3.34 17 7 0 Sunday. 0

May 13 3.00 3.44 35 9 0 600 470 27 0

May 14 3.01 3.46 39 12 0 500 550 25 0

May 15 3.01 3.56 17 ... 0 500 900 23 0

May 16 2.93 4.07 24 ... 0 290 2,500 25 0

May 17 3.01 4.34 18 ... 0 260 2,000 16 0

May 18 2.93 4.25 15 8 0 190 600 19 0

May 19 2.97 4.36 12 8 0 Sunday. 0

May 20 3.01 4.64 12 8 0 260 450 15 0

May 21 2.99 4.55 16 8 0 260 330 14 0

May 22 3.01 4.57 20 8 0 280 390 22 0

May 23 3.00 4.51 15 8 0 130 240 19 0

May 24 2.98 4.44 15 8 0 170 240 30 0

May 25 3.00 4.38 15 8 0 340 400 41 0

May 26 3.00 4.38 18 8 0 Sunday. 0

May 27 Shut down to scrape sand filter; 1.09 in. of sand removed.

May 28 Cleaning coagulant basin and treating coagulant basin with 1:2,000,000 solution of copper sulphate.

May 29 16 ... ... solution of copper sulphate.

May 30 3.00 0.11 14 8 1 Holiday. 0

May 31 3.01 0.10 17 8 1 380 18,000 150 0

June 1 3.01 0.09 15 8 1 900 7,000 150 0

June 2 3.01 0.10 17 8 1 Sunday. 0

June 3 3.01 0.10 24 10 1 550 8,000 130 0

June 4 3.04 0.11 37 13 1 6,500 7,500 140 0

June 5 3.00 0.11 65 29 1 3,200 3,600 110 0

June 6 3.00 0.11 77 46 1 1,500 800 60 1.17

June 7 2.99 0.12 64 21 1 2,100 1,500 90 1.18

June 8 2.98 0.17 46 22 1 660 1,000 60 0

June 9 3.00 0.18 44 30 1 Sunday. 0

June 10 3.01 0.18 36 26 1 240 400 32 0

June 11 3.00 0.17 30 20 1 280 300 31 0

June 12 3.00 0.17 34 22 1 330 ... 28 0

June 13 2.99 0.17 35 25 1 480 480 39 0

June 14 2.98 0.17 31 22 1 440 550 32 0

June 15 2.99 0.19 32 22 1 420 450 27 0

June 16 3.02 0.21 26 18 1 Sunday. 0

June 17 2.99 0.23 26 16 1 340 750 14 0

June 18 3.02 0.25 31 20 1 440 750 21 0

June 19 3.02 0.29 37 27 1 500 460 35 0

June 20 3.00 0.32 30 21 1 330 440 88 0

June 21 3.01 0.36 25 16 1 170 370 23 0

June 22 3.00 0.40 20 12 1 100 300 17 0

June 23 2.97 0.43 26 11 1 Sunday. 0

June 24 2.97 0.44 140 36 1 1,700 350 22 1.59

June 25 3.02 0.45 130 27 1 400 250 16 1.55

June 26 Interrupted, defective meter. 750 330 ... 0

June 27 3.00 0.43 65 15 0 ... 1,400 ... 0

June 28 3.00 0.44 47 19 0 ... 1,400 120 0

June 29 2.99 0.44 37 20 0 220 300 ... 0

June 30 2.97 0.42 30 19 0 Sunday. 0

July 1 2.99 0.37 30 18 0 400 600 85 0

July 2 3.01 0.33 32 19 0 180 1,000 50 0

July 3 3.00 0.31 36 21 0 350 310 21 0

July 4 3.00 0.30 44 30 0 Holiday.

July 5 3.00 0.29 44 35 0 550 400 41 0

July 6 3.00 0.28 39 30 0 250 280 22 0

July 7 3.00 0.28 34 24 0 Sunday. 0

July 8 3.00 0.28 25 16 0 220 260 27 0

July 9 3.00 0.27 22 13 0 50 40 19 0

July 10 2.98 0.27 47 27 1 Lost. Lost. Lost. 0

July 11 3.00 0.27 90 41 1 150 50 8 1.27

July 12 3.00 0.29 97 21 1 300 200 13 1.27

July 13 3.00 0.34 90 20 0 220 160 17 1.27

July 14 3.00 0.40 90 19 0 Sunday. 1.27

July 15 3.00 0.54 95 18 0 375 150 1.27

July 16 3.00 0.59 120 20 0 Lost. 50 Lost. 1.36

July 17 3.00 0.58 85 16 0 270 60 3 1.26

July 18 2.99 0.61 56 13 0 1,675 70 1.17

July 19 3.01 0.61 41 18 0 450 700 11 0

July 20 2.99 0.51 62 27 0 300 720 8 0

July 21 3.00 0.47 62 32 0 Sunday. 0

July 22 3.00 0.47 80 34 0 1,400 560 14 1.17

July 23 3.01 0.49 105 21 0 3,700 490 40 1.25

July 24 3.01 0.60 95 19 0 770 110 80 1.27

July 25 3.00 0.68 77 16 0 250 80 5 1.22

July 26 2.99 0.68 67 17 0 140 40 4 0

July 27 3.00 0.69 54 20 0 300 130 21 0

July 28 3.00 0.72 46 27 0 Sunday. 0

July 29 3.00 0.74 36 26 0 470 290 100 0

July 30 2.99 0.76 29 19 0 Lost. Lost. Lost. 0

July 31 2.99 0.77 21 12 0 Lost. Lost. Lost. 0

Aug. 1 3.00 0.75 16 9 0 Lost. Lost. Lost. 0

Aug. 2 3.00 0.74 15 8 0 130 140 4 0

Aug. 3 3.00 0.74 16 7 0 120 180 6 0

Aug. 4 3.00 0.75 21 6 0 Sunday.

Aug. 5 3.00 0.76 29 8 0 230 100 44 0

Aug. 6 3.00 0.79 34 12 0 85 470 ... 0

Aug. 7 2.99 1.01 21 12 0 200 450 ... 0

Aug. 8 3.00 1.31 19 11 0 100 180 45 0

Aug. 9 2.98 1.44 16 9 0 75 80 16 0

Aug. 10 3.00 1.44 24 9 0 60 90 11 0

Aug. 11 3.00 1.49 62 22 0 Sunday.

Aug. 12 3.00 1.62 120 39 0 620 260 16 1.45

Aug. 13 2.97 2.06 107 22 0 820 520 10 1.38

Aug. 14 2.97 3.06 82 19 0 850 120 26 1.22

Aug. 15 2.81 3.91 65 15 0 150 260 6 1.17

Aug. 16 3.00 4.29 45 18 0 270 340 17 0

Aug. 17 3.00 3.86 35 22 0 340 200 13 0

Aug. 18 3.00 3.47 21 13 0 Sunday.

Aug. 19 3.00 3.49 18 10 0 180 220 17 0

Aug. 20 3.00 3.56 20 8 0 210 180 16 0

Aug. 21 3.00 3.58 20 10 0 1,300 650 8 0

Aug. 22 2.99 3.73 27 13 0 3,800 360 6 0

Aug. 23 3.00 4.00 49 34 0 2,500 700 10 0

Aug. 24 3.00 4.05 36 26 0 3,900 630 12 0

Aug. 25 2.98 4.06 34 24 0 Sunday.

Aug. 26 3.00 4.20 21 13 0 700 310 16 0

Aug. 27 3.00 4.31 19 11 0 470 250 12 0

Aug. 28 2.99 4.40 18 10 0 500 160 18 0

Aug. 29 3.01 4.41 17 9 0 360 110 9 0

Aug. 30 2.98 4.46 15 8 0 320 310 14 0

Aug. 31 Scraped. 1.88 in. of sand removed. 13 ... ... 200 100 ... 0

Sept. 5 3.00 0.10 34 4 0 360 950 ... 1.04

Sept. 6 3.00 0.10 160 3 0 15,000 1,500 190 1.35

Sept. 7 3.00 0.09 64 3 0 2,000 260 100 1.20

Sept. 8 3.00 0.08 56 4 0 Sunday. ... 1.04

Sept. 9 3.00 0.08 59 3 0 220 180 38 1.04

Sept. 10 2.97 0.07 57 3 0 18,000 150 29 1.06

Sept. 11 2.98 0.07 65 2 0 2,700 200 37 1.04

Sept. 12 2.98 0.08 72 2 0 1,000 125 19 1.04

Sept. 13 3.00 0.08 87 3 0 2,300 200 72 1.20

Sept. 14 3.00 0.08 72 3 0 2,400 360 36 1.12

Sept. 15 3.00 0.08 65 3 0 Sunday. 1.04

Sept. 16 3.00 0.08 65 2 0 Lost. Lost. 38 1.04

Sept. 17 3.00 0.08 52 2 0 420 200 38 1.07

Sept. 18 3.00 0.08 60 2 0 900 200 17 1.07

Sept. 19 2.98 0.08 85 2 0 2,000 220 25 1.12

Sept. 20 2.98 0.09 100 2 0 4,200 320 31 1.24

Sept. 21 2.99 0.09 120 3 0 1,100 160 19 1.33

Sept. 22 3.00 0.09 137 3 0 Sunday. 1.45

Sept. 23 3.02 0.09 112 4 0 2,100 190 15 1.41

Sept. 24 3.00 0.10 100 4 0 4,000 620 13 1.33

Sept. 25 3.00 0.11 432 3 0 56,000 290 7 1.83

Sept. 26 2.99 0.11 385 2 0 1,300 950 19 2.34

Sept. 27 3.00 0.12 245 4 0 4,000 Lost. 20 1.91

Sept. 28 2.98 0.13 127 4 0 15,000 1,000 8 1.54

Sept. 29 2.98 0.14 105 4 0 Sunday. 1.34

Sept. 30 2.99 0.15 115 3 0 Lost. Lost. 46 1.35

Oct. 1 3.00 0.15 82 3 0 600 1,700 22 1.24

Oct. 2 2.98 0.16 65 3 0 4,400 550 8 1.09

Oct. 3 3.00 0.17 59 2 0 900 330 15 1.04

Oct. 4 2.99 0.17 55 2 0 850 250 11 1.03

Oct. 5 2.99 0.19 59 2 0 2,000 450 25 1.04

Oct. 6 2.98 0.20 59 2 0 Sunday. 1.04

Oct. 7 2.98 0.21 52 2 0 1,250 2,300 42 1.04

Oct. 8 2.97 0.21 54 2 0 11,000 100 15 1.04

Oct. 9 2.98 0.22 51 2 0 2,000 1,600 7 1.04

Oct. 10 2.98 0.24 50 2 0 800 Lost. 24 1.04

Oct. 11 2.98 0.25 47 2 0 2,000 1,200 21 0

Oct. 12 2.97 0.26 36 3 0 1,200 1,200 19 0

Oct. 13 2.98 0.27 40 4 0 Sunday. 0

Oct. 14 2.98 0.29 47 5 0 1,200 830 25 0

Oct. 15 2.99 0.31 41 5 0 900 Lost. 105 0