Entire Design Manual - Greenville County

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controls from being implemented during the active construction phases of a particular project. Variances The Greenville County Storm Water Plan Review Agency may grant or approve a written variance from any of the requirements of the regulations set forth in this Design Manual. These variances apply where there are exceptional circumstances applicable to sites such that strict adherence to the regulations could result in unnecessary hardship and not fulfill the intent of the regulations. A written request for variance shall be provided to the Greenville County Storm Water Plan Review Agency and shall specifically state the variances sought and all data that supports the variance. The Greenville County Storm Water Plan Review Agency shall not grant a variance unless and/or until the applicant provides sufficient specific site data and justification for the variance. 2.3 Special Pollution Abatement Permits A Special Pollution Abatement Permit is required when development or redevelopment occurs within a watershed that drains to a waterbody listed as impaired by the South Carolina Department of Health and Environmental Control (SCDHEC) or has an established total maximum daily load (TMDL) developed and implemented for a pollutant(s) of concern to ensure that effective best management practices (BMPs) are used to control water quality for these waterbodies. A Special Pollution Abatement Permit will be valid for a period of five (5) years, at which point it must be renewed. At the time of renewal, any deficiencies in the control of the targeted pollutants or management method must be corrected. Any development that occurs without a required permit shall be a violation of Division 9 of the Greenville County Storm Water Management Ordinance. Development in other areas known to have particular adverse water quality pollutant impacts may also be required to comply with this requirement at the discretion of the Director. Areas that qualify have been identified by sampling and monitoring results and are given as priority areas for water quality treatment. Outstanding resource waters may also qualify for compliance with this requirement for protection of their classification. Requirements for Special Pollution Abatement Permit requests are presented along with Anti-Degradation Rule requirements in Section 9.9 of this Design Manual. Greenville County, South Carolina January 2013 Storm Water Management Design Manual 2-6
Chapter 3. PLAN SUBMITTAL 3.1 Storm Water Management Planning 3.1.1 Purpose The purpose of Storm Water Management Planning is to ensure that storm water management is considered and fully integrated at the early planning stages of the site-development process. This involves a more comprehensive approach to site planning and a thorough understanding of the physical characteristics and resources associated with the project site. Site designers are encouraged to develop comprehensive Storm Water Management Plans for proposed development. This planning includes addressing each of the following categories separately: Storm water quantity controls; Erosion and sediment control; Storm water quality controls; Storm water conveyance controls; and, Pollution abatement controls. The result of this planning is a comprehensive report that contains technical information and analysis to submit to the Greenville County Storm Water Management Review Agency to determine if the proposed development meets the Greenville County storm water regulations and the standards contained in this Design Manual. 3.1.2 Preferred Storm Water Management Facilities Storm water management facilities may include structural and non- structural practices. Natural swales and other natural runoff conduits shall be retained where practicable. Where additional storm water management facilities are required to satisfy the minimum control requirements, the following measures are examples of what may be used in their order of preference: 1. Low impact development (LID) practices, such as minimizing the area of streets, parking lots and rooftops; bio-retention swales and basins; porous pavement; or other innovative measures to reduce runoff volume and protect water quality. 2. Facilities designed to encourage overland flow, slow velocities of flow, and flow through buffer zones; 3. Regional storm water detention structures (dry basins); 4. Regional storm water retention structures (wet basins); 5. On-site storm water detention structures (dry basins); 6. On-site storm water retention structures (wet basins); and 7. Infiltration practices, where permeable soils are present. Greenville County, South Carolina January 2013 Storm Water Management Design Manual 3-1
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 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: The Greenville County Storm Water P
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
Page 75 and 76: Use Figure 5-1 (Composite CN) if th
Page 77 and 78: 5.2.3.3. Factors Affecting the Time
Page 79 and 80: 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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