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Watershed Action Plan Watershed Action Plan December 2002 Mission Watersheds Statement To protect, sustain, and enhance the quality and quantity of all water resources to insure the health, safety, and welfare of the citizens, and preserve the diverse natural resources and aesthetic and recreational assets of Chester County and its watersheds. Disclaimer The maps, data and information presented herein were compiled by the Chester County Water Resources Authority for the County of Chester, PA and are hereby referenced to the Chester County, Pennsylvania Water Resources Compendium (2001). These information and data are pro- vided for reference and planning purposes only. This document is based on and presents the best information available at the time of the preparation. Funding Partners Chester County and the Chester County Water Resources Authority express their appreciation to those entities who provided financial support for this effort. This project was funded by: • Chester County Board of Commissioners. • Pennsylvania Department of Conservation and Natural Resources, Bureau of Recreation and Conservation, Keystone Recreation, Park and Conservation Fund Program. • Pennsylvania Department of Environmental Protection, and U. S. Environmental Protection Agency Nonpoint Source Pollution Management Program. • Brandywine Valley Association and William Penn Foundation. • U. S. Geological Survey. Chester County Board of Commissioners Karen L. Martynick, Chairman Colin A. Hanna Andrew E. Dinniman Watershed Action Plan December 2002 Prepared by: Chester County Water Resources Authority Chester County Planning Commission Camp Dresser and McKee Gaadt Perspectives, LLC Prepared as a component of: Chester County, Pennsylvania Water Resources Compendium _________________________ Prepared under a Nonpoint Source Pollution Management Grant funded by Pennsylvania Department of Environmental Protection and U. S. Environmental Protection Agency Table of Contents Acknowledgements ................................................................................................................ iv Section 1. Watershed Setting ..................................................................................................1 Section 2. Planning Framework..............................................................................................3 Section 3. Watershed Characteristics ....................................................................................5 Population ......................................................................................................................5 Land Use .......................................................................................................................5 Impervious Cover...........................................................................................................5 Geology .........................................................................................................................5 Watershed Water Budgets..............................................................................................6 Ground Water Balances .................................................................................................7 DE River Basin Commission Southeastern PA Ground Water Protected Area ............8 Ground Water Quality ...................................................................................................9 Stream Water Quality ....................................................................................................9 State Water Protected Use Designations........................................................................9 Stream Water Quality Assessments – Impaired Waters ..............................................10 Total Maximum Daily Load Regulations ....................................................................10 Nonpoint Source Pollutant Loads ................................................................................10 National Pollutant Discharge Elimination System (NPDES) Phase II Regulations....11 Biological Diversity Monitoring..................................................................................11 Pennsylvania Natural Diversity Index (PNDI) ............................................................12 Cultural, Recreational and Historic Resources ............................................................12 First Order Streams......................................................................................................12 Land Use Analysis within Stream Corridors ...............................................................13 Sources of Water Supplies...........................................................................................13 Surface Water Withdrawals and Discharges................................................................13 Integrated Water Resources Planning to Meet Future Needs .....................................14 Section 4. Watershed Management Needs and Priorities ..................................................16 Inventory of Watershed Management Needs...............................................................16 Watershed and Subbasin Priorities ..............................................................................16 Section 5. Priority Watershed Management Objectives and Actions ...............................19 Goals and Objectives ...................................................................................................19 Recommended Priority Management Actions.............................................................20 Other Recommended Management Actions ................................................................20 Ongoing Initiatives.......................................................................................................20 Section 6. Indicators of Progress ..........................................................................................21 Landscapes Indicators .................................................................................................21 Watersheds Indicators .................................................................................................21 Section 7. References .............................................................................................................22 Ridley Creek Watershed Action Plan i Tables 1 Subbasins within the Watershed 2 Snapshot of Watershed Characteristics 3 Population – 1998 Estimates and 2020 Projections by Subbasin 4 Land Use in the Watershed 5 Percent Impervious Cover by Subbasin 6 Estimated 1998 Net Ground Water Withdrawals by Subbasin 7 Protected Water Use Designations 8 Average Yearly Brillouin’s Diversity Index Values for the Watershed 9 PNDI Sites Located Within the Watershed 10 First Order Stream Miles 11 Drainage Areas in First Order Streams 12 Land Use Within Corridors of First Order Streams 13 Land Use Within Corridors of Higher Order 14 Estimated Average Annual Water Withdrawals and Future Needs by Subbasin – 1998 and 2020 15 List of Small Community Water Systems (shown on Figure 23) 16 Inventory of Watershed Management Needs 17 Subbasin Priorities 18 Recommended Priority Management Actions 19 Components of the Landscapes Index 20 New Watersheds Indicators for Landscapes Index Figures 1 Basemap of Watershed 2 Subbasins 3 Municipalities within the Watershed 4 Inventory of Problems and Potential Concerns 5 Stream Resources and Competing Uses 6 1995 Land Use 7 Estimated Percent Impervious Cover in Subbasins - 1998 8 Generalized Geology 9 1998 Net Ground Water Withdrawals as a Percent of the 1 in 25 Year Average Annual Baseflow 10 2020 Net Ground Water Withdrawals as a Percent of the 1 in 25 Year Average Annual Baseflow 11 Municipalities Located within the DRBC Ground Water Protected Area 12 State Protected Water Use Designations 13 Municipalities Required to Implement NPDES Phase II Regulations 14 Location of USGS Biological Monitoring Sites 16 Cultural, Recreational and Historic Resources 16 Drainage Areas of First Order Streams 17 Land Use Within One-Quarter Mile Corridor of First Order Streams 18 Land Use Within One-Quarter Mile Corridor of Higher Order Streams 19 Recommended Integrated Water Resources Planning Regions ii Ridley Creek Watershed Action Plan Figures (continued) 20 Recommended Net Ground Water Withdrawal Management Thresholds 21 Chester County Areas of Planned Growth and Future Needs - Water 22 Chester County Areas of Planned Growth and Future Needs - Wastewater 23 Community Water Supply Systems Operating Within or Near Chester County Appendices A Water Balance Data Sheet B Watershed and Subbasin Data Sheets C Watershed and Subbasin Nonpoint Source Loadings Data Sheets D Additional Recommendations of Management Actions E Ongoing Initiatives Ridley Creek Watershed Action Plan iii Section 1. Watershed Setting The Ridley Creek watershed has several primary characteristics that lay the foundation for the priority management needs: S The land use of the watershed is approximately 45% developed, with the majority of the development being single-family residential housing (35%), and 34% wooded. S The watershed includes an extensive assembly of natural, historic, cultural and recreational features, making the watershed and all of its resources collectively a significant and important regional resource. S Substantial areas of the lower portion of the watershed are densely developed and have no stormwater management facilities. S Because of the dense development in the lower portions of the watershed, the estimated percentage
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