Box 22, Folder 11: Water Levels-Various Data, 1865-1873

[Calculation]...which is sufficient for a city 23 times as large as Milwaukee.

60 gallons pr. day is a large allowance for each individual.

Evaporation from Land Surface is taken to be one tenth as much as from water surface.

Cedar Lake

area about 1 3/8 sq. miles or 880 acres. area of drainage bason about 13 sq. miles. Rain fall about 2 1/2 feet pr ann.

Map of the Surface drained into Lake Horicon Wisconsin.

Rock river at Horicon, measured by James Worrall in September 1867, gave 27.651 cubic feet pr minute; equal to 14,533,365,600 cubic feet per annum, which is believed to be about the average flow, for years.

If the annual rainfall on this basin be taken as 34 inches we have in a year 35,544,960,000 and it would show that nearly 1/2 of this rain fall runs off through the river, but it is probable that the measurement was taken when more than the average quantity was running.

October 1st 1867 Water again in Canal & mills commenced running

October 12th 1867

Water used to day equals that required for 4 runs mill stones-and consumes the entire flow of the river, there being none wasted at the wier, and none passing over or leaking through the dam. Surface about a foot below the top of the dam, as recently rebuilt.

[sketch of dam].

Measurement of water running over the wier Oct. 13th when all the mills were shut down, and all the water of the river running over the wier!

[Table of measurements].

102

[Full Page of Handwritten calculations and measurements].

over.