Entire Design Manual - Greenville County

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ACRONYMS AND ABBREVIATIONS (CONTINUED) RECP Rolled Erosion Control Product RUSLE Revised Universal Soil Loss Equation SCDHEC South Carolina Department of Health and Environmental Control SCDOT South Carolina Department of Transportation SCPCA South Carolina Pollution Control Act SCS Soil Conservation Service SMSRA Storm Water Management and Sediment Reduction Act SUDS Simplified Urban Drainage System SWPPP Storm Water Pollution Prevention Plan SWMP Storm Water Management Plan TMDL Total Maximum Daily Load TRM Turf Reinforcement Mat TRP Tree Protection Plan TSS Total Suspended Solids TW Tailwater USDA United States Department of Agriculture USEPA United States Environmental Protection Agency USGS United States Geological Survey USLE Universal Soil Loss Equation VFS Vegetated Filter Strip WQV Water Quality Volume Greenville County, South Carolina January 2013 Storm Water Management Design Manual xiii
Chapter 1. INTRODUCTION 1.1 Purpose of the Manual The purpose of this Storm Water Management Design Manual is to provide engineers, developers, plan reviewers, inspectors, contractors, property owners, and interested citizens involved in land development within the unincorporated, non-South Carolina Department of Transportation (SCDOT) regulated areas of Greenville County and within the municipalities that chose to participate with Greenville County as co-permitees (Simpsonville, Mauldin, Travelers Rest and Fountain Inn are co-permittees) in its National Pollutant Discharge Elimination System (NPDES) Municipal Separate Storm Sewer System (MS4) Permit, with the following information: Storm water management requirements; Summarization of the permit application process; Submittal requirements and the plan review process; Technical guidance to meet storm water management design requirements; and, Guidelines for designing, implementing, and maintaining storm water best management practices (BMPs) used in Greenville County to improve water quality, and minimize storm water runoff impacts due to increased flow volumes and peak discharge rates from developed areas. This Storm Water Management Design Manual has been prepared in fulfillment of the requirements of the Greenville County Storm Water Management Ordinance as imposed by NPDES Permit No. SC230001 and the South Carolina Storm Water Management and Sediment Reduction Act to accomplish the following objectives: Reduce storm water adverse impacts on water quality; Reduce storm water adverse impacts on water quantity; Protect downstream areas from adverse storm water quantity and quality impacts resulting from development; Identification of what is required for storm water plan submittal and plan reviews; and, Submittal of high quality storm water design plans from the design community. Greenville County, South Carolina January 2013 Storm Water Management Design Manual 1-1
Page 1 and 2: GREENVILLE COUNTY STORM WATER MANAG
Page 3 and 4: 3.10.1 Purpose ....................
Page 5 and 6: 8.4.2 Design of Riprap Channel Lini
Page 7 and 8: LIST OF TABLES Table Name Page# Tab
Page 9 and 10: Figure 8-10 Subsurface Draiange Cap
Page 11 and 12: Standard Drawing WQ-08 Standard Dra
Page 13: ACRONYMS AND ABBREVIATIONS AASHTO A
Page 17 and 18: Effects of Urbanization on Watershe
Page 19 and 20: Utilize nontraditional lot designs
Page 21 and 22: South Carolina Storm Water Manageme
Page 23 and 24: Nothing in the Storm Water Manageme
Page 25 and 26: Chapter 2. STORM WATER MANAGEMENT R
Page 27 and 28: Technical Report The technical repo
Page 29 and 30: The Greenville County Storm Water P
Page 31 and 32: Chapter 3. PLAN SUBMITTAL 3.1 Storm
Page 33 and 34: flooding or water quality or other
Page 35 and 36: Plan. However, concurrence in the c
Page 37 and 38: interfere with access to the easeme
Page 39 and 40: Agency, and does not require prepar
Page 41 and 42: 3.3.3 Storm Water Management Design
Page 43 and 44: Design details and computation for
Page 45 and 46: of the Clean Water Act; Description
Page 47 and 48: 1. Restrict or prohibit uses that a
Page 49 and 50: Each permit must include: Floodplai
Page 51 and 52: water in storm water management fac
Page 53 and 54: 3.4 Digital Submittal Requirements
Page 55 and 56: 3.5.3 Incomplete Storm Water Manage
Page 57 and 58: Final Storm Water Management Site P
Page 59 and 60: 2. The owner has obtained applicabl
Page 61 and 62: 2. Upgrade of Existing Detention or
Page 63 and 64: standards. The following conditions
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Chapter 4. EASEMENTS 4.1. Purpose A
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left hand corner of the plat. No ot
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equired, only the SCS Method or oth
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Description of Area Runoff Coeffici
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The SCS CN Method begins with a rai
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Use Figure 5-1 (Composite CN) if th
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5.2.3.3. Factors Affecting the Time
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Diversion, Swales, Paved gutters, R
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T c : Time of concentration (T c )
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Mild slopes less than 2 percent. Si
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484 300 t/Tt q/qu Q/Qp q/qu Q/Qp 3.
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triangular approximation, k r = t r
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5.6.2 Normalized Peak Flow Rate If
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Rainfall-runoff calculations carrie
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Chapter 6. HYDRAULICS 6.1. Open Cha
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6.1.3 Momentum Equation The momentu
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Type of Flow Media Min Normal Max N
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The hydraulic radius (R) for a trap
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Rearrangement of the continuity equ
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Water quality and channel protectio
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all three equations should be utili
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6.3.4 Critical Depth in Culverts Wh
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Select entrance coefficient K e fro
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Type of Structure and Design of Ent
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Therefore, Inlet Control prevails a
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6.4.3 Flow Through a Rock Ditch Che
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Stage (m) Flow Length (m) Unit Flow
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6.5.1.4 Pipe Size The minimum pipe
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where backwater effects created fro
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2) Knowing the channel dimensions,
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Table 6-5. Maximum Permissible Velo
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Chapter 7. STORM WATER DETENTION DE
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Evaluate the control structure outl
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6. Access: Maintenance access shall
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4. Access Port: Access to the subsu
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asin area. In calculating runoff vo
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equirements, The downstream propert
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times gully erosion is formed on th
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8.2. Purpose This chapter of the De
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8.3.2 Alternative Erosion Preventio
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Manning’s n of matting: 0.025 Sid
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**If side slopes were less than 3:1
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V S = Y D W * 43,560 Where V S is t
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If construction of a particular sit
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are located Appendix F and include:
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must be obtained. For Greenville Co
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Solution: Part (a) 1. Estimate the
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If the ditch check ratio intersects
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8.7.4.1 Silt Fence Design Aid Ratio
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B. 1. A Cecil D 15 topsoil is 0.006
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A sediment storage volume shall be
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Chapter 9. WATER QUALITY 9.1. Water
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lakes (US EPA, 1997). Such nutrient
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Table 9-4. Event Mean Concentration
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Event mean pollutant concentrations
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Permanent water quality ponds and d
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only the permanent pools of storm w
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9.7. Non-Structural Water Quality C
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A ( K T ) = cd I [( ) − K] Where:
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General Structural Control Sand Fil
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BMP TSS TP TN Estimated Pollutant R
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Limited Structural Control Vegetate
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equired water quality standard. For
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Chapter 10. LOW IMPACT DEVELOPMENT
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Minimize imperviousness by reducing
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10.1.1.5.1 Residential Residential
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Maximize sheet flow Modify/ lengthe
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Table 10-3. LID Techniques for use
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from infiltration. The results of t
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volume control, needed to maintain
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Table 10-4. Site Constraints of LID
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Chapter 11. STREAM PROTECTION AND R
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advantages. Vegetated measures prov
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Frequency of bank-full flow based o
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with geotextiles and geogrids suppl
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Date and location of the site inspe
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Failure to comply with the storm wa
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on the property, and payment of all
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Entire Design Manual - Greenville County

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