| Abstract: | Data on the chemical quality of baseflow from 33 small streams that drain basins of differing land-use type and intensity within the Croton watershed were collected seasonally for 1 year to identify and characterize the quality of ground-water contributions to surface water. The watershed includes twelve of New York City?s water-supply reservoirs. Baseflow samples were collected a minimum of three days after the most recent precipitation and were analyzed for major ions, boron, and nutrients. Findings ? ? Concentrations of selected chemical constituents in baseflow were strongly affected by the predominant land use in a given basin. Land uses included forested undeveloped, unsewered residential, sewered residential, and agricultural (horse and dairy farms). ? A positive linear relation was indicated for chloride concentration in baseflow and the basin?s annual rate of road-salt application (or density of two-lane roads). Chloride concentration exhibits a relatively stable relation to road-salt application rate or 2-lane road density throughout the year. ? Positive linear relations were indicated for nitrate concentration in baseflow and the basins unsewered housing density. Nitrate is characterized by a different relation to unsewered housing density for each season, with the highest observed nitrate concentrations during the winter and the lowest concentrations during the summer. ? Baseflow nitrate concentrations in sewered basins, and in unsewered basins with riparian wetland buffers between residential development and the stream, were lower than concentrations predicted from unsewered-housing density. |
| Genre: | USGS Numbered Series |
| ProdID: | 27649 |
| Citation Author: | Heisig, Paul M. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | 15 p. :col. ill., col. map ;28 cm. |
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| Citation Publisher: | Dept. of the Interior, U.S. Geological Survey ;
Branch of Information Services, distributor, |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 99-4173 |
| Citation Search Results Text: | Effects of residential and agricultural land uses on the chemical quality of baseflow of small streams in the Croton Watershed, southeastern New York; 2000; WRI; 99-4173; Heisig, Paul M. |
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| Citation Year: | 2000 |
| Type: | citation/reference |
| Text: | Effects of residential and agricultural land uses on the chemical quality of baseflow of small streams in the Croton Watershed, southeastern New York; 2000; WRI; 99-4173; Heisig, Paul M. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| Date Other: | Thu, 1 Feb 2001 00:00 -0600 |
| Publisher: | Dept. of the Interior, U.S. Geological Survey ;
Branch of Information Services, distributor, |
