SWAT Literature Database for Peer-Reviewed Journal Articles

Title:A Watershed-scale assessment of cost-effectiveness of sediment abatement with flow diversion terraces 
Authors:Yang, Q., Z. Zhao, G. Benoy, T.L. Chow, H.W. Rees, C.P.-A. Bourque and F.-R. Meng 
Journal:Journal of Environmental Quality 
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URL (non-DOI journals): 
Broad Application Category:pollutant only 
Primary Application Category:BMP assessment 
Secondary Application Category:economic assessment 
Watershed Description:14.5 km^2 Black Brook in northeastern New Brunswick, Canada 
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Abstract:Soil conservation benefi cial management practices (BMPs) are eff ective at controlling soil loss from farmlands and minimizing water pollution in agricultural watersheds. However, costs associated with implementing and maintaining these practices are high and often deter farmers from using them. Consequently, it is necessary to conduct cost-benefi t analysis of BMP implementation to assist decision-makers with planning to provide the greatest level of environmental protection with limited resources and funding. Th e Soil and Water Assessment Tool (SWAT) was used to evaluate the effi cacy of fl ow diversion terraces (FDT) in abating sediment yield at the outlet of Black Brook Watershed (BBW), northwestern New Brunswick. Diff erent FDT-implementation scenarios were expressed as the ratio of land area protected by FDT to the total cultivated area. From this analysis, we found that average annual sediment yield decreased exponentially with increased FDT protection. When the proportion of FDT-protected areas was low, sediment reductions caused by FDT increased sharply with increasing use of FDT. Similarly, marginal sediment yield abatement costs (dollar per tonne of sediment reduction) increased exponentially with increasing proportion of FDT-protected area. Th e results indicated that increasing land protection with FDT from 6 to 50% would result in a reduction of about 2.1 tonne ha–1 yr–1 and costs of sediment reduction increased from $7 to $12 per tonne. Increasing FDT-protected cropland from 50 to 100%, a reduction of about 0.9 tonne of sediment ha–1 yr–1 would occur and the costs would increase from $12 to $53 per tonne of sediment yield reduction.