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APPENDIX 1.

CONDITION OF THE WATER DURING THE YEAR.

Condition of the water at Great Falls, Dalecarlia receiving, Georgetown distributing, and Washington City reservoirs, and height of water over the dam at Great Falls for each day during the year.

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July 1

1901.

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11

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a The Georgetown distributing reservoir was out of service from August 9 to October 15, 1901, on account of making connection between the reservoir and the west shaft gatehouse. Observations began at the Washington City reservoir January 11, 1902.

21

36

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22

36

36 36

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.70

36

.70

36

.70

.70

Condition of the water at Great Falls, Dalecarlia receiving, Georgetown distributing, and Washington City reservoirs, etc.-Continued.

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Dalecarlia receiving
reservoir, south
connection.
Georgetown distrib-
uting reservoir,
effluent gatehouse.
Washington City
reservoir, effluent.
Height of water over
dam at Great Falls
(feet).

Oct. 23

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Nov. 1

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Dec. 1

4.90

2.70

2.20

2.00

1.90

1.70

1.50

1.40

1.40

1.40

1.30

1.50

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4.80

6.50

5.50

5.70

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Condition of the water at Great Falls, Dalecarlia receiving, Georgetown distributing, and Washington City reservoirs, etc.—Continued.

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According to the scale for recording the condition of the water as regards clearness, the numbers 0 to 7, inclusive, correspond to very turbid; 8 to 14, turbid; 15 to 21, slightly turbid; and 22 to 36, clear.

The following table shows the condition of the water at various parts of the system during the year:

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Daily gauge pressures at the office of the Washington Aqueduct at 9 o'clock a. m.

Month.

Main. 1.

2. 3.

4.

5. 6.

7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24.

25. 26.

27. 28. 29. 30. 31. Average.

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30

30

30

30

30

30

30

30 30

30

August

36 31 31 31 31

31

31 31

31 31 31

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48 37

37

38 38 38 38 37

37

57

38

38

38

37

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30 30 30 30 30

31

31

31

31 31

31 31 31

31.00

36

36

36

36

36

30

30 30

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October..

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31

31

31 31 31 31 31

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30

30

30 30 30

30 30 30 30 30

30

31.00
36.97
30.00

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1902.

January

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40 40 40 40

30

30

30

30

30 30 30 30 30 30 30 30 30

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38

30

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40

41

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30 30 30

30 30 30 30 30

30

30

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31 31 31 31 31 31 31 31 31 31 40 40 40 40 40 40 40 40 40 40 30 30 30 30 30 30 31 31 31 31 31 40 40 40 40 40 40 40 40 40 40 40 41 30 30 30 30 30 30 30 30 30 36 31 31 31 31 31 31 31 31

31

31 31 31

31 31 31 31 31

31

31

31

30.00

31.00

39.13

30.00

31.00

882 88%

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41 41

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31 41 41 41 41 41 30 30 30 30 30 30 30 30 31 31 31 31 31 31 31 31 41 41 41 41 11 41 41 41 30 30 30 30 30 31 31 31 31 31 31 31 41 41 41 41 41 41 41

31

31

31

31

31 31 31

31 31

31 31 31 31

31

31

31

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41

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30.00

31.00

40.64

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31 31

31 31 31

31

31

31

31.00

41 41

41 41

41 41

41

41

41 40

40.96

30 30 30 30

30.00

8828

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ENG 1902-170

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