Watershed

Oral

396296 - Application of a New Integrated Decision Support Tool (i-DST) for Urban Water Infrastructure: Modeling Green, Grey, and Hybrid Infrastructure in Ballona Creek Watershed in Southern California

Monday, June 4
10:30 AM - 12:00 PM
Location: Greenway IJ
Co-Authors: Terri Hogue, Golden, Co – Colorado School of Mines; Colin Bell, Golden, CO – Colorado School of Mines; John McCray, Golden, CO – Colorado School of Mines

The water quality of receiving streams in urban watersheds are increasingly polluted from stormwater runoff. The implementation of Green Infrastructure (GI) or Best Management Practices (BMPs), within a watershed aim to mitigate the effects of urbanization by reducing pollutant loads, runoff volume, and storm peak flow. Stormwater modeling is generally used to assess the impact of GI implemented within a watershed. These modeling tools are useful for determining the optimal suite of GI to maximize pollutant load reduction and minimize cost. However, stormwater management for most resource managers and communities also includes the replacement or implementation of grey infrastructure. While grey infrastructure does little to improve stormwater quality it is very effective in terms of decreasing peak runoff volumes. An integrated decision support tool, called i-DST, that allows for the optimization and comprehensive life-cycle cost assessment of grey, green, and hybrid infrastructure, is currently being developed. The i-DST’s watershed scale tool utilizes the EPA’s System for Urban Stormwater Treatment and Analysis Integration (SUSTAIN) to optimize the types and numbers of BMPs in order to minimize cost and maximize pollutant reduction. Initial testing of the i-DST planning tool is being undertaken on the Ballona Creek Watershed located in Los Angeles. The water quality of Ballona Creek is impaired by heavy metals. Prior work has shown that the implementation of green infrastructure will achieve water quality compliance. However, scenarios that best improve water quality only reduce peak flows by 10%. Additionally, there is a limited area of public land space available to install BMPs which may pose challenges to relying only on above ground GI. The optimal suite of green, grey and hybrid infrastructure will be further evaluated using the i-DST framework. The differences in cost, BMP suites, and ancillary benefits between a variety of stormwater management plans is also being analyzed.

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396296 - Application of a New Integrated Decision Support Tool (i-DST) for Urban Water Infrastructure: Modeling Green, Grey, and Hybrid Infrastructure in Ballona Creek Watershed in Southern California



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