The design of three detention ponds in USC-TC for flood mitigation and runoff water utilization

Description

The design of three detention ponds in USC-TC for flood mitigation and runoff water utilization Mary May D. Villacampa, Kyla Jin D. Malaque, Ken Abraham C. Tagalog, Ricardo L. Fornis* Department of Civil Engineering, School of Engineering, University of San Carlos rlfornis@usc.edu.ph Impervious surfaces brought by urbanization changes the response of catchments to precipitation, decreasing ground infiltration thus promoting higher runoff generation resulting in frequent floods. Stormwater management structures have already been incorporated and implemented to reduce runoff generation post-development and preserve predevelopment peak flows. Detention ponds (DPs), for example, have been utilized to lower runoff and prolong peak runoff time during rainfall events. In this study, three DPs in series are designed to accommodate inflows coming from the contributing runoff upstream. The area draining through a new building at the University of San Carlos is delineated using ArcGIS with a resulting area of 0.07459 km2. The natural flow path from the area upstream converges and drains to the area downstream and outside the campus at the location of this building. Peak outflow of each sub-catchment is determined using HEC-HMS. SCS Curve Number and Kinematic Wave methods are used as loss and transform models, respectively. Different catchment parameters are estimated using ArcGIS and through site inspection. Subcatchments are delineated contributing to the runoff at the project site. A 12-hour storm duration with a 10-min interval is simulated in 2-, 50-, and 100-year return periods, with the highest return period that the DPs can accommodate based on their maximum size is the 100-year return period. The DPs are sized based on the available area and the elevations of the foundations, while the DPs’ depth and volume are limited because of the building foundations surrounding them. Outlets and inlets are sized based on the peak outflow considering the highest return period possible. The flow from the detention ponds is directed to the soccer field which is a dry detention pond and then stored on the storage tank with a 105- m3 volume capacity. This runoff water can only be used for non-potable use such as washing, cleaning, and the like. Keywords: detention ponds, return period, peak outflow, overflow, storage tank

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climatescan

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