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

The area of the water surface of this lake, as shown by the Land Office plats (Government Land Survey) is about 3 1/2 square miles.

[Calculations]

Hence to fill up this lake 1 foot requires 97,574,000 cubic feet.

At 3,888,000 ft pr day it would require about 25 days-say 1 month to fill this lake 1 foot

At 7 feet or 50 gallons pr day for 100,000 people it would require 138 days to draw the lake down one foot.

[Sketch of Pewaukee Lake]

Soundings made Sept. 9. 1869 Water at 1/2 stage

East half of the lake shallow, filled with weeds, wild rice, & reed grass. West half deep & free from weeds, &c.

115

Pewaukee Nov. 27th, 1869

[Handwritten Calculations and Measurements-1/2 the page].

Benjamin Boorman, owner of the mill says it has run night & day for one month, and 18 hours pr day for a month and a half, since the date of my last measurement Sept. 9th. This is equivalent to a steady run of 20 hours or 5/6 of the time; hence the actual mean daily discharge for 2 1/2 months has been

2,554,704 cubic feet.

And the lake has been drawn down less than one foot.

116

This discharge would have reduced the level of the lake nearly two feet, if there had been no supply from rains & springs; but as the actual reduction was less than one foot we may infer that 1/2 this dicharge could have been maintained without drawing down the lake; to wit

1,277,352 cub. ft. pr day At 7 ft or 50 fallons pr day this would supply 182, 480 people, or double the present population of Milwaukee.

117/118.

Water Levels-continued from page 109

[Data Tables].