| Abstract: | A test well withdrew water from the upper Floridan aquifer system at an average of 530 gallons per minute from June 1978 to July 1979. Ground-water levels were monitored in wells open to the upper Floridan (artesian) aquifer system and in wells open to the surficial (water-table) aquifer. Double-mass curves were used to separate drawdown from natural water-level fluctuations. Drawdowns in the Floridan were 4.3 feet at a site 350 feet away from the pumped well, 4.1 feet at a site 1,000 feet away, 1.0 foot at a site 1.0 mile away, and 0.4 foot at a site 5.8 miles away. After an initial drawdown of 0.2 foot at a surficial aquifer well 1,000 feet from the pumped well, there was some recovery, and long-term drawdown averaged less than 0.2 foot. In a five-day aquifer test during a period of no rainfall in 1976, the ratio of surficial aquifer drawdown to Floridan aquifer system drawdown reached equilibrum at 0.05. The results of the long-term test indicate that this ratio is the upper limit of long-term drawdown because of capture of evapotranspiration and runoff during the long-term test. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 29490 |
| Citation Author: | Rutledge, A. T. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | iv, 29 p. :ill., maps ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 84-4309 |
| Citation Search Results Text: | Use of double-mass curves to determine drawdown in a long-term aquifer test in north-central Volusia County, Florida; 1985; WRI; 84-4309; Rutledge, A. T. |
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| Citation Year: | 1985 |
| Type: | citation/reference |
| Text: | Use of double-mass curves to determine drawdown in a long-term aquifer test in north-central Volusia County, Florida; 1985; WRI; 84-4309; Rutledge, A. T. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1984/4309/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1984/4309/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
