Nutrient Contribution of Nonpoint Source Runoff in the Las Vegas Valley

Document Type

Article

Publication Date

12-2004

Publication Title

Journal of the American Water Resources Association

Volume

40

Issue

6

First page number:

1537

Last page number:

1551

Abstract

A Geographic Information System (GIS) based non-point source runoff model is developed for the Las Vegas Valley, Nevada, to estimate the nutrient loads during the years 2000 and 2001. The estimated nonpoint source loads are compared with current wastewater treatment facilities loads to determine the non-point source contribution of total phosphorus (TP), total nitrogen (TN), and total suspended solids (TSS) on a monthly and annual time scale. An innovative calibration procedure is used to estimate the pollutant concentrations for different land uses based on available water quality data at the outlet. Results indicate that the pollutant concentrations are higher for the Las Vegas Valley than previous published values for semi-arid and arid regions. The total TP and TN loads from nonpoint sources are approximately 15 percent and 4 percent, respectively, of the total load to the receiving water body, Lake Mead. The TP loads during wet periods approach the permitted loads from the wastewater treatment plants that discharge into Las Vegas Wash. In addition, the GIS model is used to track pollutant loads in the stream channels for one of the subwatersheds. This is useful for planning the location of Best Management Practices to control nonpoint pollutant loads.

Keywords

Geographic information systems; Lake Mead; Las Vegas Valley; Modeling; Nonpoint source pollution; Storm water management; Surface water hydrology; Urban run-off; Wastewater treatment; Watershed management

Disciplines

Desert Ecology | Environmental Sciences | Fresh Water Studies

Language

English

Permissions

Use Find in Your Library, contact the author, or use interlibrary loan to garner a copy of the article. Publisher copyright policy allows author to archive post-print (author’s final manuscript). When post-print is available or publisher policy changes, the article will be deposited

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