| Abstract: | A study of the hydrogeology and an analysis of the ground-water-flow system near Sagamore Marsh, southeastern Massachusetts, was undertaken with the cooperation of the U.S. Army Corps of Engineers. The purpose of the study was to improve the understanding of the current (1994-95) hydrogeologic conditions near the marsh and how the ground-water system might respond to proposed changes in the tidal-stage regime of streams that flood and drain the marsh. A 5-day aquifer test at a public-supply well adjacent to the marsh gave a transmissivity of the regional aquifer of 9,300 to 10,900 feet squared per day and a hydraulic conductivity of 181 to 213 feet per day, assuming a saturated thickness of the aquifer of 51.3 feet. The regional aquifer became unconfined near the pumped well during the test. The ratio of tidal ranges in the tidal channel to the ranges in the underlying aquifer at two sites (the lower and upper marsh) indicated aquifer diffusivities for the marsh sediments of 380 and 170 feet squared per day; these values correspond to hydraulic conductivities of 2.5 x 10-3 and 1.7 x 10-3 feet per day, respectively. The maximum distances from the tidal channel at the lower and upper marsh sites where tidal ranges would exceed 0.01 foot, as calculated from aquifer diffusivities and current (1995) tidal ranges in the tidal channels, were 24.4 and 26.7 feet, respectively. The maximum distances from the tidal channel where tidal pulses in the ground water would exceed 0.01 foot, using potential increased tidal stages resulting from proposed tidal-stage modifications and predicted by the U.S. Army Corps of Engineers, were 37.1 and 42.0 feet, respectively. A numerical model of the marsh and surrounding aquifer system indicated that the contributing area for the supply well adjacent to the marsh, for current (1994) pumping conditions, extends toward Great Herring Pond, about 2 miles northwest (upgradient) of the well, and does not extend beneath the marsh. The model also indicates that the predicted increases in tidal stages in the marsh will have a negligible effect on local ground-water levels. |
| Genre: | USGS Numbered Series |
| ProdID: | 30357 |
| Citation Author: | Walter, D. A.; Masterson, J. P.; Barlow, P. M. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | v, 41 p. :ill., maps ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey ;
Branch of Information Services [distributor], |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 96-4200 |
| Citation Search Results Text: | Hydrogeology and analysis of ground-water-flow system, Sagamore Marsh area, southeastern Massachusetts; 1996; WRI; 96-4200; Walter, D. A.; Masterson, J. P.; Barlow, P. M. |
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| Citation Year: | 1996 |
| Type: | citation/reference |
| Text: | Hydrogeology and analysis of ground-water-flow system, Sagamore Marsh area, southeastern Massachusetts; 1996; WRI; 96-4200; Walter, D. A.; Masterson, J. P.; Barlow, P. M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/wri_96_4200.jpg |
| Date Other: | Sat, 1 Mar 1997 00:00 -0600 |
| Publisher: | U.S. Geological Survey ;
Branch of Information Services [distributor], |
