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HYDRO31286
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HYDRO31286
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Last modified
8/24/2016 8:55:04 PM
Creation date
11/21/2007 1:28:26 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1981071
IBM Index Class Name
Hydrology
Doc Date
11/6/1985
Doc Name
WINDY GAP POLICY EVALUATION FOR COLO YAMPA COAL CO COAL MINES IN ROUTT CNTY COLO
From
COLO YAMPA COAL CO
To
OSM
Permit Index Doc Type
CORRESPONDENCE
Media Type
D
Archive
No
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<br />design sediment volume. This is a conservative estimate since the volume <br />below the lowest orifice is partly filled with sediments in most years. <br />1 <br />Evaporation from ponds which do not go dry was estimated by applying an <br />evaporation rate to the area of the pond at the elevation of the emergency <br />spillway. Determination of pond surface area was made from 1 to 200 scale <br />topographic maps flown after the ponds were built. <br />Evaporation at the minesite is approximately 32 inches a year, as taken <br />from U.S. Weather Bureau Technical Paper 37 (Kohler, Nordenson, and Baker, <br />1959). Evaporation from ponds was first estimated as 32 inches times the pond <br />surface area. For each pond, if evaporation volumes calculated in this manner <br />were greater than the design sediment volume, it was assumed that the pond <br />went dry and the design sediment volume was used as the estimated evaporation. <br />Evaporation from ponds which are known to have year-round inflow from beaver <br />ponds was calculated by the area times evaporation rate method. Specific <br />estimates of evaporative losses are set forth in Table 1. Ponds L, N, Q, R, <br />and S are referenced in Permit 79-171 but were never built. They have not <br />been considered in these calculations. <br />Table 1. Evaporative Losses From Sedimentation Ponds <br />1. Ponds which dry up seasonally: <br />design sediment volume = evaporation = 26.7 acre-feet <br />2. Ponds flowing year-round: <br />area X evaporation <br />31.5 acres X 32 inches g4.0 acre-feet <br />12 inches per foot <br />Total Evaporation = 110.7 acre-feet <br />-2- <br />
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