BMP Design Aids. w w w. t r a n s p o r t a t i o n. o h i o. g o v. Equations / Programs
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1 BMP Design Aids 1 Equations / Programs Outlet Discharge Equations Hydrograph and Pond Routing Programs USGS StreamStats 2 Ohio Department of Transportation 1
2 Training Intent Introduction and overview of various design aids (equations and programs) Not a detailed training on how to use each one 3 Equations / Programs Outlet Discharge Equations Hydrograph and Pond Routing Programs USGS StreamStats 4 Ohio Department of Transportation 2
3 For peak flow rate only Q = CiA Q: flow rate (cfs) C: coefficient of runoff i: rainfall intensity (in/hr) Based on time of concentration Sheet flow, shallow concentrated flow, and open channel or pipe flow A: tributary area (ac) 5 Q = CiA C: 6 Ohio Department of Transportation 3
4 7 Equations / Programs Outlet Discharge Equations Hydrograph and Pond Routing Programs USGS StreamStats 8 Ohio Department of Transportation 4
5 (0.15 for Vegetated Biofilter) 9 10 Ohio Department of Transportation 5
6 Program or Spreadsheet Calculation Use bisection method (trial and error) Inputs: Channel geometry and slope Manning s roughness coefficient Flow rate Results: Normal depth Velocity 11 Equations / Programs Outlet Discharge Equations Hydrograph and Pond Routing Programs USGS StreamStats 12 Ohio Department of Transportation 6
7 Discharge Equations Orifice flow Weir flow 13 Orifices Orifices 14 Ohio Department of Transportation 7
8 Post Construction BMP Selection & Design for Weir 15 Orifice www. t r a n s p o r t a t i o n. o h i o. g o v Orifice Flow 16 Ohio Department of Transportation www. t r a n s p o r t a t i o n. o h i o. g o v 8
9 Weir Flow L&D Vol. 2, Equations / Programs Outlet Discharge Equations Hydrograph and Pond Routing Programs USGS StreamStats 18 Ohio Department of Transportation 9
10 CDSS is a hydraulic design software developed by ODOT C Culvert Design D Ditch Design SS Storm Sewer Design 19 Equations / Programs Outlet Discharge Equations Hydrograph and Pond Routing Programs USGS StreamStats 20 Ohio Department of Transportation 10
11 Technical Release 55 (TR-55) Technical Release 20 (TR-20) Urban Hydrology for Small Watersheds Determines runoff depth (inches) Combines with unit hydrograph theory Produces runoff hydrographs Peak flow and total volume 21 CN: depth of runoff abstracted Total P Abstracted P = Runoff Depth Runoff Depth * Area = Runoff Volume NRCS unit hydrograph gives runoff volume a shape (distribution over time) Produces a full runoff hydrograph 22 Runoff Flow Rate Time Ohio Department of Transportation 11
12 23 24 Ohio Department of Transportation 12
13 Analyses that require a full hydrograph Pre vs. post volumes (CSO areas) Routing a design storm through a detention basin, bioretention cell, or infiltration trench Still gives peak flow rate, but will likely be slightly different from Rational Method 25 Equations / Programs Outlet Discharge Equations Hydrograph and Pond Routing Programs USGS StreamStats 26 Ohio Department of Transportation 13
14 Hydrograph and Pond Routing Programs Many different programs Different inputs Different calculations Different limitations Know your tool before you use it 27 Common Hydraulics and Hydrology Software Options Basic Pipe or Open Channel Capacity Calcs. Basin Inlet/Outlet Peak Flow and HGL Design Calculations Hydraflow Express Bentley CulvertMaster Bentley FlowMaster Urban Drainage HY22 HY-8, Steady/Unsteady Flow Open Channels Some Sediment Transport/Quality Often used in FEMA Floodplains HEC HEC-1 HEC-HMS HEC-2 HEC-RAS GEO-RAS Normal Gravity Sewer, Detention Pond Design Hydrology and Hydraulics Combined Rational/TR-55/SCS Hydrology Manning s/orifice/weir Hydraulic Calcs. Some Quality Calculations Available Simple Stormwater Routing Models HydraFlow Hydrographs HydraFlow Storm Sewers Bentley StormCAD Bentley PondPack HydroCAD Complex Drainage Systems that have: tail water, reverse flow, pump stations, surface flooding Horton/Green-Ampt Hydrology Hydrodynamic and Kinematic Wave Hydraulic Calcs. Detailed Quality Calculations Available Robust Stormwater Routing Models EPA SWMM Bentley CivilStorm AutoDesk SSA PCSWMM XP SWMM Ohio Department of Transportation 14
15 PondPack and HydroCAD Inputs for runoff hydrograph Area Curve number, land use, or runoff coefficient Time of concentration Design storm frequency Produces runoff hydrograph Then route that hydrograph into your BMP 29 PondPack and HydroCAD Inputs for BMP Stage vs storage curve (elevation vs. volume) Inputs for BMP discharge 800 Stage vs. depth curve Each outlet 797 WQ orifices Weirs, catch basin grates Overflow weirs Discharge pipe Downstream constraints (tailwater) Elevation (ft) Elevation vs. Volume Volume (ac-ft) 30 Ohio Department of Transportation 15
16 PondPack and HydroCAD Two types of analyses Hydrograph routing Drawdown analysis Split event into many short pieces and calculate: Volume entering Volume leaving Volume and depth in basin 31 PondPack and HydroCAD Make sure you have all of the potential discharge conveyances Make sure the BMP storage information in the model matches the design sheets Make sure the modeled discharge conveyance characteristics match the design sheets and site, including tailwater Make sure the results make sense 32 Ohio Department of Transportation 16
17 Equations / Programs Outlet Discharge Equations Hydrograph and Pond Routing Programs USGS StreamStats Ohio Department of Transportation 17
18 35 Equations / Programs Peak flow rate only Flow conditions (velocity and depth) at a given flow rate Outlet Discharge Equations Flow rate at a given outlet shape and hydraulic head Hydraulic design of culverts, ditches, and storm sewers Full runoff hydrograph (flow rate over time and full storm volume) Hydrograph and Pond Routing Programs Full hydrograph, detention, peak flow rate, and draw down analyses USGS StreamStats Peak design storm flow rates as well as other stream statistics 36 Ohio Department of Transportation 18
19 Questions? Jon Prier, P.E Ohio Department of Transportation 19
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