PERMFILE139520

• Permit No: C1981018
• IBM Index Class Name: Permit File
• Doc Date: 5/13/2002
• Doc Name: Calculations for Ponds 1 and 2 at the Slot Storage Area
• Section_Exhibit Name: Illustration 39
• Media Type: D
• Archive: No

Mr. Dan Matthews
March 30, 1983
Page 3
• The f gures below correlate average precipitation and
evapo ation figures.
Wate Balance for a 1-Year Period:
Precipitation = lOYedLn. X 2.47 Acres X 43ACre Ft3
X 1 Foot X 1 Gal. 3 X 0.227
12 Inches 0.1337 Ft
= 187,617 Gallons
Evaporation = 58.9 In. X 80 Ft. X 82 Ft. X 1 Foot
Year 12 Inches
X 1 Gallon 3 = 240,828 Gallons/Year
0.1337 Ft
An excess evaporation rate of 53,211 gallons per year
occurs for an average 1-year period in Pond #2.
Drawing #2-83(2) shows the design cf Ponds #1 and #2.
From the calculated water balances, both ponds can
accomodate normal 1-year precipitation and a 10-year,
24-hour event without discharging.
Drawing #2-83(3) gives the contributing area of runoff
• that will flow into the ditches on the east side of the
Slot Storage. The following calculations compare ditch
volume to total runoff.
Survey Point Elevation Ditch Area H ydraulic Length
1 5660 28 Ft2 250 Ft
2 5651 21 Ft2 250 Ft
3 56533 30 Ft2 250 Ft
4 5658 14 Ft2 250 Ft
5 56601 12 Ft2 250 Ft
6 56656 11 Ft2 250 Ft
7 56573 16 Ft2 250 Ft
Total Volume of Ditch = 33,000 Ft3
Contributing Area = 12.8 5 Acres
Runoff (10-Year, 24-Hour Event) = 1.8 In. X 0. 227 X 43,560 Ft
Acre
X 12FInches X 12.85 Acres = 23,257 Ft3
•