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Batavia Kill Stream Restoration

Ashland, New York<br style='line-height:2px'>Greene County Soil and Water Conservation District

HAKS provided computer hydraulic modeling for the proposed realignment and channel improvements to the Ashland section of the Batavia Kill Improvements. The project was intended to improve channel flow and alleviate adverse conditions at the site. Modeling included provisions for an existing bridge. Also required was extensive coordination with NYSDEC and FEMA. All work was performed using HEC-RAS, Version 3.1, Microstation and InRoads software. 

Our hydraulic engineers reviewed survey mapping and cross-sections provided by the Greene County Soil and Water Conservation District (GCSWCD) to determine their applicability for modeling. Three-dimensional survey (TIN and DTM format) data received from GCSWCD necessary for river modeling was input into HEC-RAS software using design flows provided by the county. HAKS determined reach lengths, bank stations and Manning’s coefficients for the proposed configuration. The result was a fully developed HEC-RAS model for the final proposed condition. 

After the geometric data and the steady flow data were input, two HEC-RAS runs were made. The first steady flow run was accomplished by using a “Known Water Surface Elevation” boundary condition at the downstream river stationing, and the second run was for the “Normal Depth” boundary condition. Output was reviewed thoroughly for completeness and technical accuracy. Floodplain limits for the post-restoration condition were provided for use by GCSWCD and NYSDEC in mapping the final floodplain.