| Title: | Modeling sedimentation-filtration basins for urban watersheds in SWAT |
| Authors: | Jeong, J., N. Kannan, J.G. Arnold, R. Glick, L. Gosselink, R. Srinivasan and M.E. Barrett |
| Year: | 2013 |
| Journal: | Journal of Environmental Engineering |
| Volume (Issue): | 139(6) |
| Pages: | 838-848 |
| Article ID: | |
| DOI: | 10.1061/(ASCE)EE.1943-7870.0000691 |
| URL (non-DOI journals): | |
| Model: | SWAT-SedFil |
| Broad Application Category: | hydrologic and pollutant |
| Primary Application Category: | urban stormwater and/or BMP assessment |
| Secondary Application Category: | Green-Ampt and sub-daily processes |
| Watershed Description: | 2.81 ha drainage area to the Jollyville SedFil (sedimentation-filtration basin), located in the city of Austin in central Texas, U.S. |
| Calibration Summary: | |
| Validation Summary: | |
| General Comments: | |
| Abstract: | Sedimentation-Filtration (SedFil) basins are one of the stormwater BMPs aimed to mitigate water quality problems in urban creeks and rivers. A new physically based model of variably saturated flows was developed for simulating flow and sediment in SedFils within the Soil and Water Assessment Tool (SWAT). The integrated SWAT-SedFil model allows for simulation of unsaturated flow in the filtration basin during small storms as well as fully saturated flow. The unsaturated flow is modeled using a modified Green & Ampt equation and the saturated flow is simulated by Darcy’s Law.
Unsaturated flow makes up only a small fraction in large storm events; however, many regular storms are small that may generate not enough runoff to create saturated flow in the filtration basin. Therefore, the combined unsaturated/saturated flow approach for modeling SedFils improved the accuracy of the model especially in long-term evaluations. Results show that the model performs well in estimating stormwater and sediment at the inlet and outlet of a SedFil. |
| Language: | English |
| Keywords: | Best management practice, Storm-water management, Runoff, Sediment, Sand filters |