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Washington County Planning Commission Washington County Planning Commission Washington County Act 167 County-Wide Stormwater Management Plan Phase II June 17, 2010 200 West Kensinger Drive, Suite 400 • Cranberry Township, PA 16066• 724.779.4777 [phone] WASHINGTON COUNTY ACT 167 PLAN PHASE II ACKNOWLEDGEMENTS The Washington County Planning Commission would like to thank the following individuals, municipalities, and agencies for their assistance and support of this project: WASHINGTON COUNTY COMMISSIONERS LAWRENCE O. MAGGI J. BRACKEN BURNS, SR. DIANA L. IREY Representing PENNSYLVANIA DEPARTMENT OF ENVIRONMENTAL PROTECTION BARRY NEWMAN RUTH SITLER Representing WASHINGTON COUNTY PLANNING COMMISSION LISA L. CESSNA, EXECUTIVE DIRECTOR JASON E. THEAKSTON CAROLINE SINCHAR JEFFREY W. LEITHAUSER DEBRA S. REA MELANIE THOMAS-FINNEY HOLLY M. DAMES VINCENT P. LEY WASHINGTON COUNTY PLAN ADVISORY COMMITTEE Name Representing Name Representing Name Representing City Scott Honsaker New Eagle Chris Lawrence Jefferson Bob Kepics Monongahela Joseph Villella N. Charleroi Scott Finch Morris Anthony Spossey Washington Edward Vercoe Roscoe William Dinsmore Mount Pleasant Boroughs Roger Grandy Speers Bob Taylor N. Bethlehem Mark Chucuddy Allenport Michael Lee Stockdale Donald Hazlett N. Franklin Frank Startare Beallsville Paul Minardi Twilight Brian Spicer N. Strabane Ken Yankowsky Bentleyville Laurie Riggle W. Alexander Raymond Barley Nottingham Richard Alvarez Burgettstown Daniel Kendall W. Brownsville Frank Arcuri Peters Jon Bittner California John Opal W. Middleton George Lucchino Robinson Daniel Caruso Canonsburg Thomas Schilinski Smith Patsy Ricciutti Centerville David Blackburn Somerset Mark Alterici Charleroi Tom Hart S. Franklin Patricia Brown Claysville Townships John Stickle S. Strabane Robert Staley Coal Center Larry Headley Amwell Stephen Parish Union Carol Basara Cokeburgh Scott Weiss Blaine Robert Mercante W. Bethlehem William Beck Deemston James Mounts Buffalo David Martin W. Finley Karen Polkabla Donora Sam Bear Canton George Shemanksy West Pike Donald Piere Dunlevy Thomas Rapp Carroll Blake McCandless E. Washington Kevin Camerson Cecil Other Agency/Groups Larry Pollack Elco Harlan Shober Chartiers Dominic Sacchotti PennDOT District 12 Mark Segedi Ellsworth Dean Casciola Cross Creek Gary Stokum WCCD Tim Kegel Finleyville Rick Fidler Donegal Washington Public Safety Terry George Green Hills Paul Battaglini E. Bethlehem Susan Morgan Watershed Alliance Charles Fife Houston Ernie Moorehead E. Finley Flood Task Force Joseph DeBlassio Long Branch Herman Pennline Fallowfield Cooperative Extension. Thomas Yesenosky Marianna Donald Winkler Hanover California University Tim Thomassy McDonald Alexander Hopewell Fish and Boat Commission Edward Salvini Midway MarkHamilton Kinney Independence Army Corps of Engineers TABLE OF CONTENTS Part I Section I – Introduction Rainfall and Stormwater Runoff .............................................................................................................................. I-1 Watershed Hydrology ............................................................................................................................................... I-2 Stormwater Management Planning ...................................................................................................................... I-3 Low- Impact Development and Stormwater Management ............................................................................. I-4 Section II – Goals and Objectives of the Act 167 Stormwater Management Plan Stormwater Planning and the Act 167 Process ....................................................................................................II-1 Plan Advisory Committees .......................................................................................................................................II-1 Section III – Washington County Description Political Jurisdictions ................................................................................................................................................. III-1 Land Use .................................................................................................................................................................... III-2 Climate ....................................................................................................................................................................... III-4 Geology ..................................................................................................................................................................... III-6 Slopes ......................................................................................................................................................................... III-7 Soils .............................................................................................................................................................................. III-8 Watersheds .............................................................................................................................................................. III-10 Impoundments........................................................................................................................................................ III-13 Surface Water Quality ........................................................................................................................................... III-14 Floodplain Data ...................................................................................................................................................... III-16 Section IV – Existing Stormwater Regulations and Related Plans Existing Federal Regulations .................................................................................................................................. IV-1 Existing State Regulations ....................................................................................................................................... IV-2 Existing Municipal Regulations .............................................................................................................................. IV-6 Existing Related Plans............................................................................................................................................ IV-10 Section V – Significant Problem Areas and Obstructions Identification of Problem Areas and Obstructions ............................................................................................. V-1 Hydraulic Modeling .................................................................................................................................................. V-6 Problem Area Assessment ...................................................................................................................................... V-6 Recommendations ............................................................................................................................................... V-10 Section VI – Technical Analysis – Modeling Technical Approach ............................................................................................................................................... VI-1 Hydrologic Model Preparation ............................................................................................................................. VI-1 Hydrologic Model Parameters .............................................................................................................................. VI-4 Model Calibration ................................................................................................................................................... VI-7 Modeling Results .................................................................................................................................................... VI-11 Stormwater Management Districts ..................................................................................................................... VI-14 Recommendations ............................................................................................................................................... VI-15 Section VII – Technical Standards and Criteria for Control of Stormwater Runoff Technical Standards for Stormwater Management ........................................................................................ VII-1 Criteria for Control of Stormwater Runoff ........................................................................................................... VII-2 Recommended Best Management Practices .................................................................................................. VII-6 Implementation of Stormwater Management Controls ................................................................................. VII-9 Section VIII - Economic Impact of Stormwater Management Planning Implementation of Stormwater Standards ....................................................................................................... VIII-1 Design Example(s) ................................................................................................................................................. VIII-1 Economic Impact of Stormwater Management Standards ......................................................................... VIII-8 Washington County Act 167 Stormwater Management Plan, Phase II (i) Section IX – Water Quality Impairments and Recommendations
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