Hydrology and subsidence potential of proposed coal-lease tracts in Delta County, Colorado
Technical Report
·
OSTI ID:5881175
Potential subsidence from underground coal mining and associated hydrologic impacts were investigated at two potential coal-lease tracts in Delta County, Colorado. Alteration of existing flow systems could affect water users in the surrounding area. An inventory was made of 20 wells (18 in the Paonia study area and 2 in the Cedaredge study area) and 16 springs in the Paonia study area. Wells completed in the Mesaverde Formation yielded a sodium bicarbonate type water. Water levels in wells ranged from 149 to 2209 feet below the land surface in the Paonia study area and were 25 and 217 feet below the land surface in the Cedaredge study area. Spring discharges in the Paonia study area ranged from 0.02 to 8.41 gallons per minute. The waters were of the calcium sodium bicarbonate type. Tests conducted in October 1982 indicated that Terror Creek in the Paonia study area lost 0.59 cubic foot per second along about 1.5 miles of thin alluvium overlying the lower Mesaverde Formation. Measurements in the same week indicated that Oak Creek in the Cedaredge study area gained 0.92 cubic foot per second along about 1.5 miles of thick alluvium overlying the Mesaverde Formation. The stream waters were a calcium bicarbonate type. Mining beneath Stevens Gulch and East Roatcap Creek could produce surface expressions of subsidence. Subsidence could partly drain alluvial valley aquifers or streamflow in these drainages. 21 refs.
- Research Organization:
- Geological Survey, Lakewood, CO (USA)
- OSTI ID:
- 5881175
- Report Number(s):
- USGS/WRI-83-4069; ON: TI85901307
- Country of Publication:
- United States
- Language:
- English
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011000* -- Coal
Lignite
& Peat-- Reserves
Geology
& Exploration
AQUIFERS
COAL DEPOSITS
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ENVIRONMENTAL QUALITY
FEDERAL REGION VIII
FORECASTING
GEOLOGIC DEPOSITS
GROUND SUBSIDENCE
GROUND WATER
HYDROGEN COMPOUNDS
HYDROLOGY
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MINERAL RESOURCES
MINING
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PERMEABILITY
RESOURCES
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STREAMS
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WATER QUALITY
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