Entire Design Manual - Greenville County

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Minimize the need for rescue and relief efforts associated with flooding and generally undertaken at the expense of the general public; Minimize prolonged business interruptions; Minimize damage to public facilities and utilities such as water and gas mains, electric, telephone and sewer lines and streets and bridges located in floodplains; Help maintain a stable tax base by providing the sound use and development of flood prone areas in such a manner as to minimize future flood height areas; and, Ensure that potential homebuyers are notified that property is in a flood area. A copy of the Greenville County Flood Control Ordinance can be found on the Greenville County website. Co-Permittee Ordinances Greenville County’s NPDES MS4 permit co-permittees also have municipal ordinances that affect storm water management within their jurisdictions. These are: Town of Simpsonville Code of Ordinances, Chapter 18, Environment, Article III Water; and, Chapter 22, Floods; Town of Mauldin Code of Ordinances, Chapter 32, Soil Erosion and Sedimentation Control; and, Chapter 40, Utilities, Article III, Storm Water Management; Town of Travelers Rest Municipal Codes, Title 5 Planning and Development, Chapter 5-20, Storm Water Management and Water Quality Controls, Chapter 5-24, Storm Water Management and Sediment Reduction, and Chapter 5-28, Floods; Town of Fountain Inn Code of Ordinances, Chapter 21 Floods; and, Land Development Regulations, Article II, Drainage System Design Standards. Greenville County, South Carolina January 2013 Storm Water Management Design Manual 1-10
Chapter 2. STORM WATER MANAGEMENT REQUIREMENTS AND STANDARDS 2.1 Overview This chapter presents a set of minimum requirements and standards for storm water management for development within Greenville County, South Carolina. The purpose of the minimum requirements and standards is to reduce the impact of storm water runoff on receiving waterbodies downstream from land development. The goal of this chapter is to address both water quantity and water quality requirements and standards associated with storm water runoff from land development. 2.2 Minimum Requirements for Development Applicability Storm water management minimum requirements and standards apply to all land development within unincorporated, non-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) in its NPDES MS4 storm water permit, that consists of one or more of the following: All development and redevelopment that involves the disturbance of one acre of land or greater; Any commercial or industrial development that falls under the NPDES Industrial Storm Water Permit; Development or redevelopment that creates a peak flow increase of greater than one cubic foot per second (cfs); Development or redevelopment that requires a storm drain pipe conveyance system (one or more pipes) or alterations to existing storm drain systems; and, Development or redevelopment that causes downstream impacts requiring preparation by an engineer or design professional. As a general requirement for submittal purposes, all land development activities that fall under these provisions shall require the following: Land Disturbance Permit Application: Storm Water Management/ Sediment Control Plan (Non- Simplified Storm Water Application) plus the first two pages of a SCDHEC Notice of Intent (NOI) Application upon project submittal); Final Site Development Plan including Erosion Prevention and Sediment Control (EPSC) Plan; and Technical Report. For land disturbing activities involving more than 5,000 square feet but less than one (1) acre of actual land disturbance which are not part of a common plan of development or sale, the person responsible for the land disturbing activity may submit a Simplified Storm Water Application. This plan does not require approval by the Director and does not require preparation or certification by the designers. Greenville County, South Carolina January 2013 Storm Water Management Design Manual 2-1
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 and 14: ACRONYMS AND ABBREVIATIONS AASHTO A
Page 15 and 16: Chapter 1. INTRODUCTION 1.1 Purpose
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: Nothing in the Storm Water Manageme
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
Page 65 and 66: Chapter 4. EASEMENTS 4.1. Purpose A
Page 67 and 68: left hand corner of the plat. No ot
Page 69 and 70: equired, only the SCS Method or oth
Page 71 and 72: Description of Area Runoff Coeffici
Page 73 and 74: 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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