PERMFILE107783

• Permit No: M1977004
• IBM Index Class Name: Permit File
• Doc Date: 6/12/1980
• Doc Name: Meeting Notes
• From: DMG
• Media Type: D
• Archive: No

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4 Evaporation is assumed to balance average annual precipi-
tation but in order to provide fora pool elevation equiva-
lent to the average annual runoff, additional capacity of
1 year of average annual precipitation will be provided
(per John Ransone, Homestake Mining Co.).
2 Assume that all runoff above Elevation 9600 is diverted away
from the reservoir area with a diversion canal.
3 100% runoff is assumed.
4 Provide 5'-0 of freeboard (per "Design of Small Dams" by the
Bureau of Reclamation, U.S. Department of the Interior).
1.4 Zero build-up of process water volume due to large make-up water
requirement at the mill is assumed.
1.5 Maximum required 25-year capacity = 4500 acre - Ft with 5'-0 of
freeboard (per Design Criteria 1.1 through 1.4).
2.0 Hydrologic Data
2.1 PMF precipitation = 12" for 1-hour thunderstorm (per "Design of
Small Dams").
2.2 100-year - 24-hour storm precipitation = 2.8" (per Precipitation
Frequency Atlas of the Western U.S., NOAA Atlas 2, Volume III -
Colorado).
2.3 Drainage area (below Elevation 9600) = 185 acres.
2.4 Average annual precipitation = 24" (per "Weather Atlas of the
United States" by the U.S. Environmental Data Service).
2.5 Peak Q = 3000 cfs from PMF runoff for diversion canal design (per
"Design of Small Dams"). Drainage area (above elevation 9600) _
140 acres.