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Control Number309816
Date and Time of Latest Transaction20150706093111.AM
General Information150706s |||||||||b ||00|||
Cataloging SourceSTII-DOST
Local Call NumberScienceDirect
Main Entry - Personal NameGeohring, Larry D.
 Wei Zhang
 Easton, Zachary M.
 Faulkner, Joshua W.
 Steenhuis, Tammo S.
Title StatementDesign and risk assessment tool for vegetative treatment areas receiving agricultural wastewater Preliminary results by Joshua W. Faulkner and 4 others
Physical Descriptionpages 1794-1801 computer file; text; 796kb
Summary, Etc.Vegetative treatment areas (VTAs) are commonly being used as an alternative method of agricultural process wastewater treatment. However, it is also apparent that to completely prevent discharge of pollutants to the surrounding environment, settling of particulates and bound constituents from overland flow through VTAs is not sufficient. For effective remediation of dissolved agricultural pollutants, VTAs must infiltrate incoming wastewater. A simple water balance model for predicting VTA soil saturation and surface discharge in landscapes characterized by sloping terrain and a shallow restrictive layer is presented and discussed. The model accounts for the cumulative effect of successive rainfall events and wastewater input on soil moisture status and depth to water table. Nash-Sutcliffe efficiencies ranged from 0.65 to 0.81 for modeled and observed water table elevations after calibration of saturated hydraulic conductivity. Precipitation data from relatively low, average, and high annual rainfall years were used with soil, site, and contributing area data from an example VTA for simulations and comparisons. Model sensitivity to VTA width and contributing area (i.e. barnyard, feedlot, silage bunker, etc.) curve number was also investigated. Results of this analysis indicate that VTAs should be located on steeper slopes with deeper, more-permeable soils, which effectively lowers the shallow water table. In sloping landscapes (>2%), this model provides practitioners an easy-to-use VTA design and/or risk assessment tool that is more hydrological process-based than current methods
Subject Added Entry - Topical TermConservation of Natural Resources -- Methods
 Department of Agriculture -- United States
 Water Movements
 Soil
 Agriculture
LocationDOST STII ScienceDirect NONPRINTS NP 13-14783 1 13-14783 Online/Download 2010-12-01
  
     
 
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Department of Science and Technology
Science and Technology Information InstituteScienceDirect
  
     
 
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