Through this project CRWP developed and implemented components of the Chagrin River Watershed Balanced Growth Plan and worked with CRWP Members to incorporate the data from this Plan into local comprehensive plans. CRWP also worked with 17 Members to review and update their comprehensive stormwater management, riparian setbackwetland setback, and conservation development district codes.

CRWP, in partnership with Ohio Department of Natural Resources (ODNR) and Ohio Nonpoint Education for Municipal Officials (Ohio NEMO), used the Source Loading and Management Model (WinSLAMM) to evaluate the effectiveness of innovative stormwater management approaches in reducing runoff volume and controlling annual sediment loads (see Modeling the Effectiveness of Traditional and Innovative Stormwater Management Strategies in the Chagrin River Watershed: Part 1 - Development Site Scale). The data shows that impervious area disconnection and bioretention show the most promise for residential areas, whereas pervious pavement and bioretention show the most promise for commercial sites. From the results of this project, CRWP and ODNR received funding under the NERR Science Collaborative Program to develop guidance that credits LID practices for peak discharge requirements.

Using the data from this modeling project CRWP, ODNR and Ohio NEMO developed watershed-scale scenarios to evaluate the potential of stream rehabilitation and other stormwater management practices to meet comprehensive stormwater management goals (see Improving Land Use in the Lake Erie Basin through Better Planning, Improved Regulations and Stormwater Modeling: Part 2 - Watershed Scale Impacts of Stormwater and Stream Corridor Management) and the stormwater management benefits of floodplain detention associated with stream rehabilitation. Results of the modeling show that peak discharge rates throughout the watershed increase as a result of land use change, however, incorporating stormwater controls such as swale drainage systems with impervious surfaces disconnected from the storm sewer system provide a significant reduction in discharge volume and peak discharge rate for some land use scenarios. The results also showed that the amount of active floodplain available in the drainage network has a large influence on peak discharge rates throughout the watershed. These results suggest that protecting active floodplain and restoring or rehabilitating disconnected floodplains will provide stormwater management benefits to the watershed.

Funding and support for this project was provided by CICEET, the Cooperative Institute for Coastal and Estuarine Environmental Technology. A partnership of the National Oceanic and Atmospheric Administration and the University of New Hampshire, CICEET develops tools for clean water and healthy coasts nationwide. Additional support for this report was provided by the Members of CRWP through their annual Member dues.