Hydraulic/chemical changes during ground-water recharge by injection
Ground-water recharge by injection of reclaimed water is a feasible method of improving ground-water quality in the shallow acquifer system in the Palo Alto Baylands along the San Francisco Bay. Ground water was initially more saline than sea water. Reclaimed water was injected at a rate of 10 gallons per minute from June 5, 1980, to July 1, 1980. At the completion of injection, water from an observation well 31 feet from the injection well was 98 percent injected water - in essence, fresh water. An abrupt rise in the water level in the injection well of about 1.5 feet during the initial injection test was the result of a 3.5 percent density difference between injected fresh water and saline ground water. The arrival of injected water at observation wells showed the same effect, allowing monitoring of chemical and hydraulic changes entirely through water-level data.
- Research Organization:
- U.S. Geological Survey, WRD, 2800 Cottage Way, Room W-2234, Sacramento, CA 95825
- OSTI ID:
- 6621479
- Journal Information:
- Ground Water; (United States), Vol. 25:3
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
AQUIFERS
WATER QUALITY
GROUND WATER
WATER TREATMENT
CALCITE
CLAYS
DENSITY
FRESH WATER
HYDRAULIC CONDUCTIVITY
HYDRAULICS
INJECTION WELLS
MONITORING
RECYCLING
SALINITY
SAN FRANCISCO BAY
SEAWATER
WASTE WATER
WATER CHEMISTRY
WATER POLLUTION CONTROL
ALKALINE EARTH METAL COMPOUNDS
CALCIUM CARBONATES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE MINERALS
CARBONATES
CHEMISTRY
CONTROL
ENVIRONMENTAL QUALITY
FLUID MECHANICS
HYDROGEN COMPOUNDS
LIQUID WASTES
MECHANICS
MINERALS
OXYGEN COMPOUNDS
PACIFIC OCEAN
PHYSICAL PROPERTIES
POLLUTION CONTROL
SEAS
SURFACE WATERS
WASTES
WATER
WELLS
520200* - Environment
Aquatic- Chemicals Monitoring & Transport- (-1989)