United States Geological Survey YearbookThe Survey, 1990 - Geology |
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Page 7
... streams . Storm - tide elevations along the eastern and northern coasts of Puerto Rico ranged between 4 and 10 feet but exceeded 12 feet near San Juan . Coastal flooding occurred in some beach and low - lying areas . The Luquillo ...
... streams . Storm - tide elevations along the eastern and northern coasts of Puerto Rico ranged between 4 and 10 feet but exceeded 12 feet near San Juan . Coastal flooding occurred in some beach and low - lying areas . The Luquillo ...
Page 19
... streams and rivers nationwide ? Trends in Water Quality How have nitrogen and phospho- rus levels in surface and ground water changed with time in response to changes in various sources ? How have best management prac- tices affected ...
... streams and rivers nationwide ? Trends in Water Quality How have nitrogen and phospho- rus levels in surface and ground water changed with time in response to changes in various sources ? How have best management prac- tices affected ...
Page 20
... stream reaches and regional - scale field studies of the occurrence and movement of toxic substances and the controlling of natural and human factors . Monitoring The USGS operates the only two national monitoring networks that measure ...
... stream reaches and regional - scale field studies of the occurrence and movement of toxic substances and the controlling of natural and human factors . Monitoring The USGS operates the only two national monitoring networks that measure ...
Page 22
... streams and the functional and structural aspects of the biological community . Within each study unit , surface ... stream reaches . In contrast , ground- water quality is studied by regional sampling , targeted sampling , and long ...
... streams and the functional and structural aspects of the biological community . Within each study unit , surface ... stream reaches . In contrast , ground- water quality is studied by regional sampling , targeted sampling , and long ...
Page 24
... streams in the Kentucky River basin occur during low flows in summer and fall and are linked to the discharge of ... stream from major brine discharges . THM compounds form during the disinfection of water supplies ; chlorine and similar ...
... streams in the Kentucky River basin occur during low flows in summer and fall and are linked to the discharge of ... stream from major brine discharges . THM compounds form during the disinfection of water supplies ; chlorine and similar ...
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activities Administration Alaska Arctic areas Assistant atrazine Award Baikal Bldg Board Bureau cartographic data Chief Hydrologist City City of w coal coastal Commission contamination cooperative Coordination County Denver Federal Center Department of Public Development disaster Division Chief drought earth science earthquake Environmental eruption Federal agencies field geologic map geologists geophysical ground water ground-water Hurricane Hugo hydrologic IDNDR Information Systems Interior investigations Island Lake Lake Baikal land lava located Loma Prieta earthquake Loudoun County Management Menlo Park ment miles mineral deposits mineral resources National Center National Mapping National Water NAWQA Office percent Planning production Puerto Rico Redoubt volcano Regional Reston River basin rock scale scientific scientists seismic Service spatial data storage storm studies surface tion Transportation U.S. Department U.S. Geological Survey U.S. Virgin Islands United users USGS Water Conservation District Water District water quality Water Resources Water-Quality Assessment