Stormwater and Low-Impact Development in San Diego, CA Mitchel J. Bartolo November 24, 2015 Source: City of San Diego.

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Presentation transcript:

Stormwater and Low-Impact Development in San Diego, CA Mitchel J. Bartolo November 24, 2015 Source: City of San Diego

Why We Care #1: Water Cycle Source: City of San Diego Infiltration Subsurface storage Overland flow Streamflow Source: Minnesota Pollution Control Agency

Why We Care #2: Pollution Bacteria/Viruses Oil and Grease Sediment/Turbidity Nutrients (N, P) Organics Pesticides Metals Source: City of San Diego, NBC San Diego

Low-Impact Development (LID) LID reduces imperviousness by replicating natural hydrology –Addresses both flow and pollution issues Parking lots, buildings, sidewalks  permeable pavement, green roofs, vegetated swales, bioretention basins

LID in San Diego

Study Area-Watershed Analysis Permebale pavement, bioswales, rain barrels “Green Street” Pilot: bacteria Vegetated swales and bioretention basins

Evaluating LID Effectiveness A)Flood Response –No USGS gage in this watershed –Precipitation varies: hard to compare B) Pollution –San Diego SWPP Program –Yearly Monitoring Data

Stormwater Conveyance System DW0275

Pollution Monitoring Data

To-Do List Sort out GIS layer acquisition w/ City of SD Analyze water quality data for each site Quanitify flow impacts with HEC-HMS model –Impervious values, before and after LID –Compare responses to a fixed storm event

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