| Abstract: | Stream quality was studied from November 1973 through June 1975 in the San Lorenzo River basin, Calif., a rapidly developing mountainous area. Dissolved-ion concentrations indicate the basin can be divided into three water-quality areas corresponding to three geologic areas. Pronounced changes in water quality occurred during storms when streamflow, turbidity, nitrogen, phosphorus, potassium, and fecal-coliform bacteria concentrations increased, while dissolved-ion concentrations decreased owing to dilution. Total nitrogen and fecal-coliform concentrations exceeded State objectives in the Zayante and Branciforte Creek drainages probably because of domestic sewage from improperly operating septic-tank systems or the primary-treated sewage effluent discharged into a pit near Scotts Valley. Diel studies did not show appreciable dissolved-oxygen depletion in streams. Greater streamflows and residential development appear responsible for reduced diversity of benthic invertebrates downstream of the residential areas in the basin. (Woodard-USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 30051 |
| Citation Author: | Sylvester, Marc A.; Covay, Kenneth J. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | v, 61 p. :ill., maps ;27 cm. |
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| Citation Publisher: | U.S. Geological Survey, Water Resources Division, |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 78-19 |
| Citation Search Results Text: | Stream quality in the San Lorenzo River Basin, Santa Cruz County, California; 1978; WRI; 78-19; Sylvester, Marc A.; Covay, Kenneth J. |
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| Citation Year: | 1978 |
| Type: | citation/reference |
| Text: | Stream quality in the San Lorenzo River Basin, Santa Cruz County, California; 1978; WRI; 78-19; Sylvester, Marc A.; Covay, Kenneth J. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, Water Resources Division, |
