Minimizing pond size using an off-site pond in a closed basin: a storm flow mitigation design and evaluation

Abstract

Construction of large on-site detention pond to manage the stormwater runoff in the project area is not only expensive, but also a waste of developable land. To minimize the pond size, a systematic design of storm fl ow routing followed by model verifi cation is necessary. This study presents a challenging stormwater management design for a site located in a complex urban setting at Tallahassee, Florida, USA. The site, a 4.6-hectare (11.4 acre) wooded area, was developed into a swimming pool complex resulting in increased post-development runoff. This increased runoff was managed by designing an on-site pond, minimized by placing it in series with an existing downstream off-site pond of a closed basin. The available storage of the downstream pond was effi ciently used to reduce the upstream pond size. To minimize the on-site pond, the design considered rearrangement and re-sizing of pre-development basins that allowed releasing some portion of post-development runoff below its pre-development level in the directions where it was allowed to drain. The excess runoff generated from the area was routed through the on-site pond and discharged into the existing off-site pond, where all runoff was retained to meet the guidelines of a closed basin. The short duration simulation results (8-hr and 24-hr design storms) confi rmed signifi cant off-site runoff reduction for the postdevelopment condition. Besides short duration simulations, the extended simulation results (for the entire 1-yr period) also revealed that the on-site and off-site ponds can jointly manage all extreme runoff including the runoff of a historical extreme wet year.

Critical success factors (CSFs) for motivating end-user stakeholder’s support for ensuring sustainability of PPP projects in Nigerian host communities

“…The residue is the most substantial pollutant from the construction site as it could possibly disturb all the three scopes of sustainability such as social, environmental and economic concurrently (Ab Rahman et al , 2010). The developed structure and the economic layout of the project area should be accustomed according to assets, environmental capacity and source of energy (Ahmad et al , 2014). The level of sediments emanated from the construction site is huge, which normally released to water bodies or occupies the whole land (Jeffress et al , 2011).…”

“…The water level of the entire project area is very high, although the normal operations of the road construction were not expected to impend resources the damage of the herbaceous shield following the development of construction sites had affected the surface water regime of the project communities (Armah et al, 2013). Water pollution can be avoided by erecting and installation of control facilities such as dewatering, contour drain, silt fence; flocculation and JEDT 21,3 retention ponds (Al-Ani et al, 2014;Ahmad et al, 2014). This influences the risks of quality water (due to pollution as a result of discharge of pollutants and waste water), river sedimentation, soil erosion, stagnation of water in borrow sites, landslides, silting of soils, contamination of the water points used by stakeholders (McPhee and Aird, 2013).…”

An Integrative Framework for Assessment of Urban Flood Response to Changing Climate

“…The goal of urban flood modeling in this study is to investigate the flood response of selected urbanized watershed to design extreme precipitation obtained with and without the consideration of changing climate. We use physically based distributed ICPR approved by FEMA (Ahmad et al., 2014; Joyce et al., 2018; Saksena et al., 2019; Streamline Technologies, 2016, 2018). ICPR allows the application of variable surface roughness for shallow and deep overland flow.…”

A Computationally Efficient and Physically Based Approach for Urban Flood Modeling Using a Flexible Spatiotemporal Structure

“…Since the focus of this study is to incorporate a computationally efficient design for large-scale urban flood modeling, this study uses a FEMA-approved model called the Interconnected Channel and Pond Routing (ICPR), a physically based, distributed model (Ahmad et al, 2014;Joyce et al, 2017;Saksena et al, 2019;Streamline Technologies, 2018.…”