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Design Example: Analyzing Capacity Contours for Flood Risk Assessment01:17

Design Example: Analyzing Capacity Contours for Flood Risk Assessment

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Area Computation by the Alternative Coordinate Method

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Updated: Jun 22, 2026

Watershed Planning within a Quantitative Scenario Analysis Framework
12:44

Watershed Planning within a Quantitative Scenario Analysis Framework

Published on: July 24, 2016

Evaluating nonpoint source critical source area contributions at the watershed scale.

Michael J White1, Daniel E Storm, Philip R Busteed

  • 1USDA-ARS, Grassland, Soil, and Water Research Lab., 808 East Blackland Rd., Temple, TX 76502-6712, USA. mike.white@ars.usda.gov

Journal of Environmental Quality
|June 25, 2009
PubMed
Summary

Identifying critical source areas (CSAs) is key for effective nonpoint-source pollution control. Targeting these high-polluting lands significantly boosts conservation efforts and improves watershed water quality.

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Area of Science:

  • Environmental science
  • Water resource management
  • Agricultural science

Background:

  • Critical source areas (CSAs) are recognized for high pollutant losses, yet often not targeted by conservation programs.
  • Lack of research exists on total CSA pollutant contributions and program effectiveness when targeting CSAs.

Purpose of the Study:

  • To identify and quantify sediment and total phosphorus loads from CSAs at the watershed scale.
  • To synthesize CSA targeting studies to aid in prioritized placement of conservation measures.

Main Methods:

  • Utilized the Soil and Water Assessment Tool (SWAT).
  • Synthesized data from six Oklahoma priority watersheds (2001-2007).

Main Results:

  • 5% of land area yielded 50% of sediment and 34% of phosphorus load within the studied watersheds.
  • Worst 5% of agricultural land contributed 22% of total agricultural pollutant load on average.
  • Pollutant loads from agricultural CSAs were over four times greater than average agricultural areas.

Conclusions:

  • Targeting CSAs can significantly improve the effectiveness of state and federal water quality programs.
  • Prioritized implementation of conservation measures in CSAs offers a high return on investment for pollutant reduction.