Entire Design Manual - Greenville County

More documents

Recommendations

Info

Pre-development hydrologic analysis and calculations that determines the existing storm water runoff volumes, peak flow rates and flow velocities. Post-development hydrologic analysis and calculations that determines the storm water runoff volumes, peak flow rates and flow velocities. A 360 degree map showing: Data to support the hydrology model Areas delineated, curve numbers (CNs), slopes, contours, flow path segments Photography Network diagram for the hydrology model Storm water management control facility design: Narrative describing the storm water management control facilities selected. Location of all storm water management control facilities. Supporting calculations that justify that the facilities meets the Greenville County Storm Water Management Permit requirements. Includes hydrographs, stage storage volumes, and stage discharge values for water quantity and water quality control facilities and design calculations and elevations for all storm water conveyance systems. A permanent maintenance plan for each permanent storm water management facility. Erosion and sediment control plan: Narrative describing the erosion and sediment control facilities selected. Location of all erosion and sediment control facilities. Resulting design calculations and trapping efficiencies for all sediment control facilities. Downstream analysis calculations showing the effect of post-development design flows on downstream storm water conveyance systems and channels. Minimum Preliminary Site Development Plan Requirements All Preliminary Site Development Plans shall include as a minimum the following: A vicinity map indicating a north arrow, scale, boundary lines of the site and other information necessary to locate the development site. The existing and proposed topography of the development site except for individual lot grading plans in single-family subdivisions. Physical improvements on the site, including present development and proposed development. Location, dimensions, elevations, and characteristics of all storm water management facilities. As a minimum, easements shall have the following characteristics. Provide adequate access to all portions of the drainage system and structures. Provide sufficient land area for maintenance equipment and personnel to adequately and efficiently maintain the drainage system and all storm water facilities. Restriction on easements shall include prohibiting all fences and structures which would Greenville County, South Carolina January 2013 Storm Water Management Design Manual 3-6
interfere with access to the easement areas and/or the maintenance function of the drainage system. All areas within the site which will be included in the land disturbing activities shall be identified and the total disturbed area calculated. The location of temporary and permanent vegetative and structural storm- water management control measures. An anticipated starting and completion date of the various stages of land, disturbing activities and the expected date the final stabilization will be completed. A determination that the development is in compliance with the County Floods and Flood Control Ordinance. At the discretion of the Director, for all portions of the drainage system which are expected to carry over 50 cubic feet per second (cfs) for the 100-year storm, the 100-year plus one foot flood elevation analysis shall be required if one of the following criteria apply: The estimated runoff would create a hazard for adjacent property or residents The flood limits would be of such magnitude that adjacent residents should be informed of these limits. For all portions of the drainage system which are expected to carry 150 cfs or more for the 100-year storm, the 100-year plus one foot flood elevation analysis shall be done and flood limits shall be shown on the drainage plans. Such data shall be submitted in digital form, as well as in print, in a format specified by the Director. Plans must meet all other applicable plan requirements in effect at the time of submittal. A Tree saving and planting plan consistent with the requirements in the Greenville County Tree Ordinance and the Landscape Plan requirements of this Design Manual. To prevent water quality degradation and to improve the water quality aspects of the drainage system, the plan shall include best management practices to control the water quality of the runoff during the land disturbing activities and during the life of the development. The plan shall include all engineering calculations needed to design the system and associated structures including pre- and post-development velocities, peak rates of discharge, inflow and outflow hydrographs of storm water runoff at all existing and proposed points of discharge from the site. Description of site conditions around points of all surface water discharge including vegetation and method of flow conveyance from the land disturbing activity. Construction and design details for structural controls. The expected timing of flood peaks through the downstream drainage system shall be assessed when planning the use of detention facilities. All storm water management facilities and all major portions of the conveyance system through the proposed development (i.e., channels, culverts) shall be analyzed, using the 100-year design storm, for design conditions and operating conditions which can reasonably be expected during the life of the facility. The results of the analysis shall be included in the hydrologic-hydraulic study. Greenville County, South Carolina January 2013 Storm Water Management Design Manual 3-7
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 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: Plan. However, concurrence in the c
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
Page 81 and 82: T c : Time of concentration (T c )
Page 83 and 84: Mild slopes less than 2 percent. Si
Page 85 and 86: 484 300 t/Tt q/qu Q/Qp q/qu Q/Qp 3.
Page 87 and 88:
triangular approximation, k r = t r
Page 89 and 90:
5.6.2 Normalized Peak Flow Rate If
Page 91 and 92:
Rainfall-runoff calculations carrie
Page 93 and 94:
Chapter 6. HYDRAULICS 6.1. Open Cha
Page 95 and 96:
6.1.3 Momentum Equation The momentu
Page 97 and 98:
Type of Flow Media Min Normal Max N
Page 99 and 100:
The hydraulic radius (R) for a trap
Page 101 and 102:
Rearrangement of the continuity equ
Page 103 and 104:
Water quality and channel protectio
Page 105 and 106:
all three equations should be utili
Page 107 and 108:
6.3.4 Critical Depth in Culverts Wh
Page 109 and 110:
Select entrance coefficient K e fro
Page 111 and 112:
Type of Structure and Design of Ent
Page 113 and 114:
Therefore, Inlet Control prevails a
Page 115 and 116:
6.4.3 Flow Through a Rock Ditch Che
Page 117 and 118:
Stage (m) Flow Length (m) Unit Flow
Page 119 and 120:
6.5.1.4 Pipe Size The minimum pipe
Page 121 and 122:
where backwater effects created fro
Page 123 and 124:
2) Knowing the channel dimensions,
Page 125 and 126:
Table 6-5. Maximum Permissible Velo
Page 127 and 128:
Chapter 7. STORM WATER DETENTION DE
Page 129 and 130:
Evaluate the control structure outl
Page 131 and 132:
6. Access: Maintenance access shall
Page 133 and 134:
4. Access Port: Access to the subsu
Page 135 and 136:
asin area. In calculating runoff vo
Page 137 and 138:
equirements, The downstream propert
Page 139 and 140:
times gully erosion is formed on th
Page 141 and 142:
8.2. Purpose This chapter of the De
Page 143 and 144:
8.3.2 Alternative Erosion Preventio
Page 145 and 146:
Manning’s n of matting: 0.025 Sid
Page 147 and 148:
**If side slopes were less than 3:1
Page 149 and 150:
V S = Y D W * 43,560 Where V S is t
Page 151 and 152:
If construction of a particular sit
Page 153 and 154:
are located Appendix F and include:
Page 155 and 156:
must be obtained. For Greenville Co
Page 157 and 158:
Solution: Part (a) 1. Estimate the
Page 159 and 160:
If the ditch check ratio intersects
Page 161 and 162:
8.7.4.1 Silt Fence Design Aid Ratio
Page 163 and 164:
B. 1. A Cecil D 15 topsoil is 0.006
Page 165 and 166:
A sediment storage volume shall be
Page 167 and 168:
Chapter 9. WATER QUALITY 9.1. Water
Page 169 and 170:
lakes (US EPA, 1997). Such nutrient
Page 171 and 172:
Table 9-4. Event Mean Concentration
Page 173 and 174:
Event mean pollutant concentrations
Page 175 and 176:
Permanent water quality ponds and d
Page 177 and 178:
only the permanent pools of storm w
Page 179 and 180:
9.7. Non-Structural Water Quality C
Page 181 and 182:
A ( K T ) = cd I [( ) − K] Where:
Page 183 and 184:
General Structural Control Sand Fil
Page 185 and 186:
BMP TSS TP TN Estimated Pollutant R
Page 187 and 188:
Limited Structural Control Vegetate
Page 189 and 190:
equired water quality standard. For
Page 191 and 192:
Chapter 10. LOW IMPACT DEVELOPMENT
Page 193 and 194:
Minimize imperviousness by reducing
Page 195 and 196:
10.1.1.5.1 Residential Residential
Page 197 and 198:
Maximize sheet flow Modify/ lengthe
Page 199 and 200:
Table 10-3. LID Techniques for use
Page 201 and 202:
from infiltration. The results of t
Page 203 and 204:
volume control, needed to maintain
Page 205 and 206:
Table 10-4. Site Constraints of LID
Page 207 and 208:
Chapter 11. STREAM PROTECTION AND R
Page 209 and 210:
advantages. Vegetated measures prov
Page 211 and 212:
Frequency of bank-full flow based o
Page 213 and 214:
with geotextiles and geogrids suppl
Page 215 and 216:
Date and location of the site inspe
Page 217 and 218:
Failure to comply with the storm wa
Page 219 and 220:
on the property, and payment of all
show all

Entire Design Manual - Greenville County

Create successful ePaper yourself

Delete template?

Save as template?