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Sinclair A, Jamieson R, Madani A, et al. A watershed modeling framework for phosphorus loading from residential and agricultural sources. J Environ Qual. 2014;43(4):1356-69doi: 10.2134/jeq2013.09.0368.
Sinclair, A., Jamieson, R., Madani, A., Gordon, R. J., Hart, W., & Hebb, D. (2014). A watershed modeling framework for phosphorus loading from residential and agricultural sources. Journal of environmental quality, 43(4), 1356-69. https://doi.org/10.2134/jeq2013.09.0368
Sinclair, Andrew, et al. "A watershed modeling framework for phosphorus loading from residential and agricultural sources." Journal of environmental quality vol. 43,4 (2014): 1356-69. doi: https://doi.org/10.2134/jeq2013.09.0368
Sinclair A, Jamieson R, Madani A, Gordon RJ, Hart W, Hebb D. A watershed modeling framework for phosphorus loading from residential and agricultural sources. J Environ Qual. 2014 Jul;43(4):1356-69. doi: 10.2134/jeq2013.09.0368. PMID: 25603083.
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J Environ Qual. 2014 Jul;43(4):1356-69. doi: 10.2134/jeq2013.09.0368.

A watershed modeling framework for phosphorus loading from residential and agricultural sources.

Journal of environmental quality

Andrew Sinclair, Rob Jamieson, Ali Madani, Robert J Gordon, William Hart, Dale Hebb

PMID: 25603083 DOI: 10.2134/jeq2013.09.0368

Abstract

Phosphorus (P) loading from residential onsite wastewater systems (OWSs) into neighboring surface waters is a poorly understood process in rural watersheds; this can be further challenged when rural residential dwellings are intermixed with agricultural land use. The objectives of this research were (i) to design a P onsite wastewater simulator (POWSIM) to assess P loads from individual or clusters of residential OWSs typically used in Nova Scotia, Canada; and (ii) to simulate OWS P loads in a mixed agricultural watershed (Thomas Brook Watershed [TBW], NS) using the Soil and Water Assessment Tool (SWAT) model in conjunction with POWSIM, to predict and compare P loading from agricultural and residential sources. The POWSIM loading tool has three computational components: (i) disposal field selection and treatment media mass calculation, (ii) disposal field P treatment dynamics, and (iii) soil subsurface plume P treatment dynamics. The combination TBW POWSIM and SWAT modeling approach produced a better simulation of baseflow total P (TP) loads in both a predominantly residential subcatchment and one dominated by agriculture than the SWAT model without POWSIM. The residential subcatchment had 48% of its average annual land use TP load (simulated) contributed by OWSs, whereas the agricultural subcatchment had 39%. Watershed-scale sensitivity analyses of POWSIM input parameters for 18- and 50-yr OWS operation periods found the P loading rate into the disposal field, long-term P removal rates in the disposal field and soil systems, soil maximum P sorption capacity, and mass of native soil involved in P treatment to be most sensitive.

Copyright © by the American Society of Agronomy, Crop Science Society of America, and Soil Science Society of America, Inc.

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