The challenges of retrofitting existing urban environments to incorporate stormwater low impact development (LID) best management practices (BMPs) are described in this case study. In 2014, Facilities Management and the Office of Water Programs (OWP) at California State University, Sacramento partnered with the City of Sacramento to reduce stormwater runoff volumes and pollutant loads that are discharged from campus to the American River. Through such implementation, the project demonstrated a range of LID BMPs designed and constructed in accordance with the latest edition of the Sacramento regional design manual. Funding was provided by a state grant matched by in-kind contributions from the campus and the city.
Twenty LID BMPs were installed in 2015 and 2016, including bioretention planters, rain gardens, an infiltrating bioswale, a filtration planter, porous pavement, and the conversion of a campus road to a “green street”. BMP siting was constrained by existing infrastructure and grading. Integrating the BMPs with existing facilities and landscaping and minimizing the loss of parking presented other design challenges. Construction issues included adapting to unknown underground utilities and modifying standard practices related to equipment use and material specifications.
Post-construction assessment suggests that future projects incorporate more detailed site investigations of existing grades and underlying soils. The presentation will cite the cost breakdown as well as model estimates for the expected runoff reductions. Notable aspects of the project include successful collaboration among different public entities, an extensive public outreach program, and improvements in campus water use through lawn replacement and groundwater recharge.
Office of Water Programs at California State University, Sacramento
Monday, June 4
4:00 PM – 5:30 PM
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