Stormwater Regulations


Section 101 - GENERAL PROVISIONS


Section 103 - DRAWINGS AND CALCULATIONS

Figure 103.1 Standard Title Block for Subdivisions
Figure 103.2 General Notes for Subdivisions
Figure 103.3 Summary Table for Inlet Calculations
Figure 103.4 Summary Table for Storm Sewer & Channel Design
Figure 103.5 General Notes for Sediment & Erosion Control


Section 104 - STORMWATER RUNOFF COMPUTATIONS

Figure 104.1 Intensity-Duration-Frequency Curves - 5 to 60 Minutes Storms
Figure 104.2 Depth-Duration-Frequency Curves - 1 to 12 Hour Storms
Figure 104.3 Rainfall Depth vs. Percent of 24-Hour Precipitation Events
Table 104.1 Monthly & Annual Precipitation and Evaporation Data
Table 104.2 Rainfall Depth & Duration Data
Table 104.3 Runoff Coefficients
Table 104.4 Hydrologic Soil Groups for Greene County Soils
Table 104.5 Pilgrim-Cordery Method, Cumulative Depth vs. Duration Data


Section 107 - SINKHOLES AND KARST FEATURES

Figure 107.1 Sinkhole Collapse Stabilization


Section 108 - INLETS

Figure 108.1 Allowable Flooding Depths for Streets & Parking Lots
Figure 108.2 Gutter Capacity for Greene County Standard 27' Wide Street
Figure 108.3 Street Flooding Depths - Definition of Variables
Figure 108.4 Curb Opening Inlets in Sumps - Definitions of Variables
Figure 108.5 Interception Capacity - Standard Curb Opening Inlet On Grade
Figure 108.6 Interception Capacity of Standard Curb Opening in Sump
Figure 108.7 Standard SS-5 Curb Opening Inlet
Figure 108.8 SS-5 Inlet Riser Capacity
Figure 108.9 Standard SS-6 Inlet
Figure 108.10 Typical Reinforcement SS-5 & SS-6 Inlets
Figure 108.11 Standard SS-6G Inlet
Figure 108.12 Standard DI-1 Inlet
Figure 108.13 Interception Capacity of Type DI-1 Inlet
Figure 108.14 Typical Area Inlet Depression & Concrete Apron


Section 109 - STORM SEWERS

Figure 109.1 Typical Pipe Connections at Junction Structure
Figure 109.2 Standard Junction Box
Figure 109.3 Full Flow Data for Circular Pipe
Figure 109.4 Full Flow Data for Elliptical Concrete Pipe and Concrete Pipe-Arch
Figure 109.5 Data for Corrugated Metal Pipe-Arch
Figure 109.6 Minor Losses at Structures
Table 109.1 Minimum Easement Widths


Section 110 - CULVERTS AND BRIDGES

Figure 110.1 Standard Headwalls With 30 & 45 Degree Wingwalls
Figure 110.2 Standard Straight Concrete Headwall
Figure 110.3 Standard U-Shaped Headwall
Figure 110.4 Low Water Crossing For Private Drives


Section 111 - OPEN CHANNELS

Figure 111.1 Typical Natural Channel
Figure 111.2 Typical Grass-Lined Channel
Figure 111.3 Manning's Roughness Coefficients for Grass-Lined Channel
Figure 111.4 Concrete Trickle Channel
Figure 111.5 Typical Grass-Lined Channel with Concrete Trickle Channel
Figure 111.6 Typical Channel with Concrete Invert and Grass Side Slopes
Figure 111.7 Trapezoidal Concrete Channel
Figure 111.8 Rectangular Concrete Channel
Figure 111.9 Typical Riprap Lined Channel
Figure 111.10 Typical Roadside Ditches
Table 111.1 Manning's Roughness Coefficient for Various Channel Linings
Table 111.2 Maximum Allowable Shear Stress for Various Lining Types

Section 112 - DETENTION FACILITIES FOR FLOOD CONTROL

Figure 112.1 Slot Outlet Definition Sketch
Figure 112.2 Discharge Capacity - Vertical Slot Outlet, Z=0, W=4"-8"
Figure 112.3 Discharge Capacity - Vertical Slot Outlet, Z=0, W=12"-24"
Figure 112.4 Discharge Capacity - Sloping Slot Outlet, Z=0.2, W=4"-8"
Figure 112.5 Discharge Capacity - Sloping Slot Outlet, Z=0.2, W=12"-24"
Figure 112.6 Discharge Capacity - Sloping Slot Outlet, Z=0.4, W=4"-8"
Figure 112.7 Discharge Capacity - Sloping Slot Outlet, Z=0.4, W=12"-24"
Figure 112.8 Discharge Capacity - Sloping Slot Outlet, Z=0.6, W=4"-8"
Figure 112.9 Discharge Capacity - Sloping Slot Outlet, Z=0.6, W=12"-24"
Figure 112.10 Coefficients for Flow Over Wide Embankments
Table 112.1 Discharge Coefficients for Broad-Crested Weirs

Section 114 - EROSION & SEDIMENT CONTROL

Figure 114.1 Hay Bale Dike
Figure 114.2 Silt Fence
Figure 114.3 Temporary Silt Containment Berm
Figure 114.4A Sandbag Sediment Trap for Curb Inlets
Figure 114.4B Area Inlet Protection
Figure 114.5 Temporary Diversion Berm - Curbed Street
Figure 114.6 Temporary Sandbag Diversion - Curbed Street
Figure 114.7A Gravel Filter Dam
Figure 114.7B Riprap Overflow Spillway
Figure 114.8 Temporary Sediment Basin
Figure 114.9 Typical Section - Berm & Outlet Structures
Figure 114.10 Perforated Riser Pipe
Figure 114.11 Diversion Dikes & Swales
Figure 114.12 Riprap Chute Cross-Section
Figure 114.13 Rock Check Dam
Figure 114.14 Sandbag Check Dan

Section 115 - WATER QUALITY PROTECTION

Figure 115.1 Examples of Minimizing Directly Connected Impervious Areas
Figure 115.2 Vegetative Filter Strip
Figure 115.3 Typical Grass-Lined Swales
Figure 115.4 Extended Dry Detention Basin - Dam & Outlet
Figure 115.5 Trickle Channel for Extended Dry Detention Basin
Figure 115.6 Extended Dry Detention - Schematic Plan & Section
Figure 115.7 Extended Wet Detention - Schematic Plan & Section
Figure 115.8 Sand Filter Schematic