Engineering Commons^™

A Gis-Swmm System To Evaluate Low Impact Development (Lid) Feature Effectiveness On Uno's Campus, Demetria C. Christo

University of New Orleans Theses and Dissertations

The EPA’s Storm Water Management Model (SWMM) includes the ability to model low impact development (LID) systems involving various types of green infrastructure (GI) for stormwater detention and infiltration.

The SWMM model requires hydrologic attribute inputs for individual subcatchments, including percent impervious surfaces, surface roughness, depression storage, and curve number. These SWMM attributes can be more accurately, consistently, and efficiently be defined in GIS by calculating the subcatchment area-weighted attribute values and importing them to SWMM. Thus, GIS becomes a valuable pre-processing input tool for SWMM-LID modeling.

The three objectives of this thesis are to 1) use GIS geoprocessing tools …

Low Impact Development Mitigation For Base Flood Elevation Disparity Between Adjacent Properties, Shaelynn Moore

University of New Orleans Theses and Dissertations

Disputes between adjacent property owners in which new development at higher elevation requirements has caused adverse effects in stormwater drainage towards lower, older developments has recently grown in concern. The difference of elevations between properties causes a faster sheet flow effect that bypasses existing drainage paths in the servitude. The goal of this research is to design a low impact development methodology that encourages detention and redirection back toward the shared drainage boundary. Detention is encouraged through subsurface infiltration, storage and re-direction of the flow path. Infiltration trench simulations using EPA’s SWMM software were used to mirror the new LID …