Water used, from corrected meter discharge .................. 29.97 Wasted at Canadice intake spillway .......................... 2.30 Wasted at Hemlock Lake spillway ............................. 1.74 Gain of storage ............................................. 0.60 Leakage, (Canadice conduit) and diversion ................... 2.00 Total ....................................................... 36.61 Total computed yield ........................................ 36.66
The last two figures giving totals were made up independently from different data, the last being from the runoff records of Canadice weir and Conesus Lake and the rainfall and evaporation records on the different areas. These figures show an average of 2.0 mgd yield of the drainage basins which is unaccounted for excepting as leakage and as a result of Yohon Creek diversion.
The figures in the preceding table show an average waste from Hemlock Lake spillway for the ten-year period, 1933-1942, of 1.74 mgd and from Canadice intake spillway a waste of 2.30 mgd, or a total waste of roundly 4.00 mgd. This waste is in addition to the leakage and diversion losses and results from inadequate storage. Part of the water wasted from Hemlock Lake is water previously brought in from Canadice Lake and Outlet but which could not be retained because of inadequate storage.
Owing to heavy rainfall in the winter and spring of 1942-1943 the runoff from the drainage areas tributary to Hemlock and Canadice Lakes was unusually large. Because of increased water demands, minor repairs were made to both Hemlock Lake and Canadice Lake dams to permit water to be impounded and held at somewhat higher levels than previously. In spite of this increased storage and in spite of increased use of water, the runoff was so great that a large amount of unavoidable waste occurred at both Hemlock Lake and Canadice intake. The figures for individual months, in millions of gallons of water wasted, are shown in the subjoined table.
Waste over spillways during winter and spring of 1943
Rainfall Waste over spillways at Hemlock Canadice Total Month Hemlock Lake Lake (1) (2) (3) (4) (5) inches mill. gals. mill. galls. mill. galls. Dec. 1942 4.15 181.04 - - 181.04 Jan. 1943 1.65 1,103.15 488.26 1,591.41 Feb. 1943 1.42 312.48 426.51 738.99 Mar. 1943 2.23 69.52 159.94 229.46 Apr. 1943 4.53 1,638.46 537.92 2,176.38 May 1943 5.91 2,474.53 1,352.76 3,827.29 June 1943 3.14 295.93 238.11 534.04 Total 23.03 6,075.11 3,203.50 9,278.61
The total amount of waste in the winter and spring of 1942-43 was 9,278 million gallons. This, with present average use of 35 mgd, would, if it could have been impounded, supply the entire requirements of the City for 265 days. These figures strongly emphasize the need for additional storage in order to develop the full water-yielding capabilities of the present system.
The item of 2 mgd leakage and diversion would be wholly eliminated in conjunction with the project described in this report. The area at the head of Springwater Creek, the runoff from which is now diverted into Canaseraga Creek, would be restored to Springwater Creek, the present Hemlock Lake dam would be replaced by the new dam near Hemlock village, on a better foundation, and the use of the Canadice intake and diversion conduit would be discontinued inasmuch as it would no longer be needed, since the entire yield of the Canadice Lake and Canadice Outlet drainage basin would flow directly into the lower basin of the new reservoir.