Impacts of the Tampa Bypass Canal system on the areal hydrology, Hillsborough County, Florida

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Authors:Knutilla, R. L.; Corral, M. A., Jr.
Author Affiliations:Primary:
U. S. Geol. Surv., Tallahassee, FL, United States
Source:Reston, VA [Water-Resources Investigations - U. S. Geological Survey, No.WRI84-4222, 65p. Publisher: U. S. Geological Survey,], United States. ISSN: 0092-332X
Publication Date:1984
Note:In English. 32 refs.
Summary:The Tampa Bypass Canal system was constructed in north-central Hillsborough County to divert water from the Hillsborough River to alleviate flooding in Tampa and Temple Terrace. Construction started in 1966 and ended in 1981. Excavation of the canal system resulted in cutting into the confining bed that separates the upper Floridan Aquifer from the overlying surficial aquifer and in several places breached the upper Floridan Aquifer. Records of discharge from the canal area indicate that base-flow discharge for the period 1975 to 1978 was about one-and-a-half times the discharge prior to construction. Discharges for Baker and Flint Creeks, the inlet and outlet streams of Lake Thonotosassa, which is near the canal area, have not been affected by construction of the canal system. Water levels of the upper Floridan Aquifer adjacent to the tidal reach of the canal system have not been affected by canal construction. Water levels of the upper Floridan Aquifer upstream of structures S-162 and S-159 and in the Cow House Creek area are generally 2 to 4 feet lower as a result of construction. Water levels in wells near structure S-161 on the Harney Canal closely follow levels of the Hillsborough River, Indicating a good hydraulic connection between the river and the upper Floridan Aquifer. Water-quality data from the Upper Floridan aquifer wells near the mouth of the Palm River showed a decline in specific conductance (700° to 200 micromhos) and in concentrations of chloride (90 to 60 milligrams per liter). Further upstream in the Palm River area, increases in specific conductance (1,200 to 1,500 micromhos) and chlorides (200 to 350 milligrams per liter) were noted. Chloride concentrations in water from upper Floridan Aquifer well 10 near structure S-160 showed a gradual increase from 1971 to about 1979, as did the specific conductance. Chloride concentrations increased from about 60 to 90 milligrams per liter, and specific conductance increased from about 650 to 750 micromhos. Chemical-quality data for water from other wells show minor or temporary changes in the concentrations of some constituents.—Modified author abstract.
Subjects:Aquifers; Canals; Chloride ion; Chlorine; Discharge; Drainage; Engineering geology; Environmental geology; Geochemistry; Ground water; Halogens; Hydrochemistry; Hydrology; Impact statements; Levels; Surface water; Surveys; USGS; Water quality; Waterways; Florida; Floridan Aquifer; Gulf Coastal Plain; Hillsborough County Florida; United States; Tampa Bypass Canal
Coordinates:N275500 N280700 W0821500 W0822600
Record ID:1985034636
Copyright Information:GeoRef, Copyright 2018 American Geosciences Institute.
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