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Water 2018, 10(9), 1200; https://doi.org/10.3390/w10091200

Estimating the Infiltration Area for Concentrated Stormwater Spreading over Grassed and Other Slopes

1
Department of Biosystems Engineering and Soil Science, University of Tennessee, 2506 E.J., Knoxville, TN 37996, USA
2
Efficient Energy of Tennessee, 7317 Clinton Hwy, Powell, TN 37849, USA
*
Author to whom correspondence should be addressed.
Received: 2 August 2018 / Revised: 21 August 2018 / Accepted: 31 August 2018 / Published: 6 September 2018
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Abstract

This research developed a new approach for calculating the area over which water spreads after being released from a confined conduit onto a sloped planar surface with defined roughness. In particular, the goal was to predict how stormwater would spread onto a sloped grass lawn after being discharged from a disconnected gutter downspout or through a parking lot curb cut. The need for this stems primarily from regulators increasingly requiring developers to infiltrate more of the runoff created by site development, but designers not having good tools for estimating the infiltration area associated with such “overflow” practices. The model is largely based on Manning’s equation applied at multiple cross-sectional areas of flow downslope, with additional modifications allowing the water to spread laterally. The model results were compared to laboratory experiments of water spreading across a roughened painted surface and two different artificial turfs. The new model predicted the wetting area with average absolute errors of 6.0% and 5.9% for a fine-bladed artificial turf and a coarse-bladed artificial turf, respectively. In addition, while validating the modeled flow spreading across a range of roughnesses, the model had an absolute error of 5.2% for a rough painted surface meant to represent unfinished concrete. View Full-Text
Keywords: disconnected downspout; green infrastructure; infiltration area; water spreading disconnected downspout; green infrastructure; infiltration area; water spreading
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Tyner, J.S.; Yoder, D.C.; Parker, J.; Credille, W.C. Estimating the Infiltration Area for Concentrated Stormwater Spreading over Grassed and Other Slopes. Water 2018, 10, 1200.

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