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Chapter 2 Stormwater Management Appendix - Fauquier County

Chapter 2 Stormwater Management Appendix - Fauquier County

Design Standards Manual

Design Standards Manual 1 st Edition A201.8.1.B Stream Channel Erosion 1. The Plan-approving authority may determine that some watersheds or receiving stream systems require enhanced criteria in order to address the increased frequency of bankfull flow conditions brought on by land development projects. Therefore, in lieu of the reduction of the 2- and 10-year post-developed peak rate of runoff as required in subsection 201.8.1.A.2 of this Manual, the land development project being considered shall provide 24-hour extended detention of the runoff generated by the 1-year, 24-hour duration storm at the discretion of the Plan-approving authority. A201.8.10 Maintenance and Access Easements SWM/BMP and Drainage Easement Widths Pipe Diameter Minimum Easement Width 15” – 23” 10’ 24” – 32” 20’ 33” – 48” 25’ Pipe Depth Minimum Easement Width 0’ – 9.9’ 10’ 10’-19.9’ 20’ 20’+ 30’ Minimum Access Road Width = 8’ Minimum Access Road Easement = 10’ Access Road and Easement Width Access Roads % of Grade Road Treatment 0% - 3.49% grass 3.5 % - 6.99% compacted gravel mix (21-A) 7.0% - 12.0% pavement Revisions Adopted: July 12, 2012 Design Standards Manual Chapter 2: Drainage D-38

Design Standards Manual 1 st Edition A203.2.2.C Stormwater Management Plan Calculations Figure 2.1 Fauquier County Rational Method IDF Curve Source: Virginia Stormwater Management Handbook Revisions Adopted: July 12, 2012 Design Standards Manual Chapter 2: Drainage D-39

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