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 103.1 Standard Title Block 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