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Summary statistics and graphical comparisons of historical hydrologic and water-quality data; Seco Creek Watershed, South-Central Texas

Open-File Report 98-627

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Abstract

The U.S. Geological Survey collected hydrologic (rainfall, streamflow, and reservoir content) and water-quality data in the Seco Creek watershed, south-central Texas. Most of the data from 15 sites were collected as part of a study in cooperation with the U.S. Department of Agriculture and the Texas State Soil and Water Conservation Board to evaluate the effects of agricultural best-management practices on surface- and ground-water quantity and quality in the 255-square-mile watershed. Nearly 400 best-management practices at 58 sites were implemented by landowners in the watershed during March 1990-September 1995. Most of the data are from the early 1990s, the period during and after implementation of best-management practices. Data from five sites include water quality and are summarized in tables and graphics in the text; and data from all 15 sites are summarized on a diskette. Maximum annual rainfall among the sites for which data are presented in the text (excluding one site) for the during-and-after-implementation period (March 1990-September 1995) was 53.27 inches in water year 1992. Maximum annual total streamflow among the sites for the period was 63,400 acre-feet, also in water year 1992. At the one site with water-quality data (under base-flow conditions) for both the before-implementation period and the during-and-after implementation period of best-management practices, percentiles (5, 25, 50, 75, 95) for specific conductance, nitrate concentration, and fecal coliform density were less for the during-and-after-implementation period than for the before-implementation period.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Summary statistics and graphical comparisons of historical hydrologic and water-quality data; Seco Creek Watershed, South-Central Texas
Series title:
Open-File Report
Series number:
98-627
Edition:
-
Year Published:
1998
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
iv, 37 p. :ill., map ;28 cm. +1 computer disk (3 1/2 in.)
Time Range Start:
1990-03-01T12:00:00
Time Range End:
1995-09-30T12:00:00