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Accueil du site → Doctorat → États-Unis → 2020 → Advancing understanding and prediction of redevelopment impacts on stormwater runoff in semi-arid urban areas

Colorado School of Mines (2020)

Advancing understanding and prediction of redevelopment impacts on stormwater runoff in semi-arid urban areas

Panos, Chelsea Lynne

Titre : Advancing understanding and prediction of redevelopment impacts on stormwater runoff in semi-arid urban areas

Auteur : Panos, Chelsea Lynne

Université de soutenance  : Colorado School of Mines

Grade : Doctor of Philosophy (PhD) 2020

Résumé partiel
As the global urban population grows, cities are densifying by redeveloping previously developed spaces. “Smart growth” through redevelopment is increasing the impervious coverage of urban areas and impacting the hydrologic regime in uncertain ways. Cities are looking to update current stormwater management criteria, which often exempt redevelopments, based on data-driven decisions informed by watershed-scale hydrologic modeling. Future stormwater management strategies must also consider climate changes and flood mitigation via low impact development (LID). Using the Berkeley neighborhood of Denver, Colorado, we investigated the impacts of redevelopment land use change, along with climate change and LID implementation, on stormwater quantity using a high-resolution, calibrated Stormwater Management Model for PC (PCSWMM). The model includes 170 subcatchments and parcel-scale predictions of impervious cover change for three scenarios of future redevelopment.Simulations of design storms for multiple redevelopment scenarios predict that an increase of 1% in impervious area from redevelopment will increase surface runoff by 1.63% for the 2-yr, 24-hr design storm and by 0.91% for the 100-yr, 24-hr design storm resulting in greater relative flood risks for smaller storm events. When assessing the effectiveness of LID to mitigate increases in runoff from redevelopment, we found that model sensitivity to LID siting and routing parameters can impact the potential for meeting regulatory compliance

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