The Chagrin River watershed is partially undeveloped at present, yet still experiences flooding, erosion, and water quality problems. Given the tremendous potential and pressure for development and redevelopment, it is critical that CRWP member communities understand the impact of development on flooding, erosion, and attainment of water quality standards. Chagrin River Watershed Impervious Area Study (pdf 4.1MB, published in 2004) presents the extent of existing and proposed impervious cover and provides an analysis of the impact of impervious cover in the Chagrin River watershed.

We used regionally specific measurements of impervious cover to estimate current imperviousness; to determine the expected imperviousness in member communities at build out under existing zoning; and to determine the expected imperviousness at build out with zoning allowing higher density. This study also evaluated the change in storm water runoff rate and volume at build out with existing zoning; at build out with higher density zoning; and at build out under existing zoning, using innovative storm water best management practices.

This study highlights that the Chagrin River watershed overall is near a critical point of development and future development must be appropriately planned and include good stormwater management. Steps local communities can complete to ensure development continues to occur in a sustainable manner include:

  • Comprehensive planning,
  • Targeted open space acquisition,
  • Riparian and wetland setbacks,
  • Good stormwater management, and
  • Alternative site designs to maintain overall low density.

Please note that this study has been updated to reflect more detailed analysis in several CRWP member communities. Any members that would like to include this information in their comprehensive planning activities should contact CRWP This email address is being protected from spambots. You need JavaScript enabled to view it. for additional information.

This study was made possible by generous support provided by the Coastal Zone Management Act, administered by the Office of Ocean and Coastal Resource Management, National Oceanic and Atmospheric Administration, and the Ohio Coastal Management Program administered by the Ohio Department of Natural Resources, Office of Coastal Management, and the member communities of the Chagrin River Watershed Partners, Inc.