Model evaluation of the hydrogeology of the Morris Bridge well field and vicinity in West-Central Florida
Water-Resources Investigations Report
80-29
Prepared in cooperation with the Southwest Florida Water Management District
By: Paul D. Ryder, Dale M. Johnson, and James M. Gerhart
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Abstract
The Morris Bridge well field in west-central Florida, which is being developed may have a maximum well-field withdrawal of 40 million gallons per day. The water will be pumped from the Floridan aquifer--a sequence of carbonate rocks about 1,100 feet thick underlying surficial sand and clay deposits. A highly fractured and transmissive zone about 500 feet below National Geodetic Vertical Datum of 1929 will supply a large proportion of the water. Two-dimensional and three-dimensional digital flow models were used to evaluate the hydrogeology of the area. The model-derived leakance distribution (a property of the confining bed) for a 285-square-mile area ranged from 0.00002 to 0.008 per day. Model-derived transmissivity values for the Floridan aquifer ranged from 37,000 to 600,000 feet squared per day. Model-derived specific yield values for the surficial aquifer ranged from 0.05 to 0.30. The three-dimensional model was used to predict drawdowns in both the Floridan and surficial aquifers in response to a 40 million gallon per day stress. Mass-balance data from a 30-day simulation with no recharge from rainfall show percentage of withdrawn water that is derived from: (1) aquifer storage, (2) the Hillsborough River, and (3) reduction of evapotranspiration losses. (USGS)
Study Area
| Publication type | Report |
|---|---|
| Publication Subtype | USGS Numbered Series |
| Title | Model evaluation of the hydrogeology of the Morris Bridge well field and vicinity in West-Central Florida |
| Series title | Water-Resources Investigations Report |
| Series number | 80-29 |
| DOI | 10.3133/wri8029 |
| Year Published | 1980 |
| Language | English |
| Publisher | U.S. Geological Survey |
| Description | vi, 92 p. |
| Country | United States |
| State | Florida |
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