SwinOSD: a computer tool for designing onsite detention basin Online publication date: Tue, 27-Apr-2021
by Monzur A. Imteaz; Iqbal Hossain; Amimul Ahsan; Abdallah Shanableh
International Journal of Hydrology Science and Technology (IJHST), Vol. 11, No. 3, 2021
Abstract: A computer tool was developed to calculate sizing requirements of onsite detention (OSD) basins. The tool reads design rainfall and temporal pattern from pre-populated spreadsheets, which are linked with the tool. The tool calculates OSD storage required from the calculated runoff time-series (for a particular time period) and user-provided permissible site discharge (PSD). The tool also calculates maximum storage required considering worst temporal pattern of rainfall for a conservative design. It also calculates average storage volume required taking averages of calculated storages based on all the temporal patterns. Eventually, for a selected water height, the tool calculates required orifice diameter to maintain a given PSD. The tool calculated storage requirements were compared with the widely used urban drainage model, DRAINS. For all the selected scenarios, the DRAINS simulated storage-depth curves show that the developed tool calculated results are compatible with DRAINS calculations under the same scenario.
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