United States Geological Survey YearbookU.S. Geological Survey, 1994 - Geology |
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Page 30
... concentrations in mines , methane causes explosions . By extracting coal - bed gas before mining , the potential danger is reduced and an energy resource gained . Another source of unconventional natu- ral gas that has attracted ...
... concentrations in mines , methane causes explosions . By extracting coal - bed gas before mining , the potential danger is reduced and an energy resource gained . Another source of unconventional natu- ral gas that has attracted ...
Page 41
... concentrations in sediments and benthic invertebrates to provide this under- standing . For example , the biological effects of pesticides entering the bay during high river flows are being examined by conducting laboratory toxicity ...
... concentrations in sediments and benthic invertebrates to provide this under- standing . For example , the biological effects of pesticides entering the bay during high river flows are being examined by conducting laboratory toxicity ...
Page 45
... concentrations in the water prior to its discharge to the South Platte River , thereby decreasing the effect of irrigated agriculture on water quality in the river . The U.S. Geological Survey ( USGS ) National Water - Quality ...
... concentrations in the water prior to its discharge to the South Platte River , thereby decreasing the effect of irrigated agriculture on water quality in the river . The U.S. Geological Survey ( USGS ) National Water - Quality ...
Page 46
... concentrations of nitrate in water in the recharge area for indicated river reaches . Median concentrations of nitrate were calculated for samples collected from 1992 through 1994 . Mass - balance - estimated nitrate concentrations in ...
... concentrations of nitrate in water in the recharge area for indicated river reaches . Median concentrations of nitrate were calculated for samples collected from 1992 through 1994 . Mass - balance - estimated nitrate concentrations in ...
Page 47
... concentrations in ground - water discharge , the process did not completely denitrify the ground water . As a result , ground - water dis- charge still affected the quality of water in the South Platte River . Peter McMahon has over 10 ...
... concentrations in ground - water discharge , the process did not completely denitrify the ground water . As a result , ground - water dis- charge still affected the quality of water in the South Platte River . Peter McMahon has over 10 ...
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