STORMWATER MODELING AND STREAM RESTORATION

eDesign Dynamics worked with Michael Van Valkenburgh Associates on a stream restoration at Vassar College in Poughkeepsie, New York.

As part of the project, we made several site visit to collect field data to verify existing conditions. Using this data verified in the field, we modeled several existing and proposed stream cross-sections to ensure that the proposed design would increase stream conveyance and reduce potential flooding. Additional work included detailing stream restoration materials such as boulder veins, large woody debris, and cross veins.

A model was developed to calculate bankfull flow rates for a series of cross-sections. Contour maps were evaluated to determine the decrease in evaluation and the probability for flooding over the banks during peak flows. The objective of the modeling exercise was to determine appropriate stream widths, bank slopes, and materials to best stabilize the stream system. Recommendations also included methods to detain water at higher levels than the streambed itself to slow runoff and prevent downstream flooding.