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WinTR-55 Modeling Multiple Sub-area Watersheds

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WinTR-55 Modeling Multiple Sub-area Watersheds

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  1. WinTR-55Modeling Multiple Sub-area Watersheds WinTR-55 Development Team

  2. Sub-Area and Reach Concepts

  3. Watershed- system of sub-areas and reaches Sub-areas- watersheds that generate runoff Reaches- represent watershed flow paths (stream channels) or structures B A C Reach 1c D Reach 2e E Sub-area/Reach Concepts TR-55 Tutorial

  4. Sub-area/Reach Concepts • Watershed - system of sub-areas and reaches • Sub-areas- generate runoff • feed into the upstream end of reaches • Reachesor Routing Elements- represent watershed stream flow paths or structures • ChannelRouting elements - Stream Reaches • StructureRouting elements - Reservoir/Structure Reaches • Watershed Outlet- downstream end of the watershed (required for all watersheds) TR-55 Tutorial

  5. Sub-areaA Reach 1a(storage routing) Sub-area B Sub-areaC Reach 2c (Reach Routing) Legend: Storage Area Sub-Area Inflow Points Outlet Schematics TR-55 Tutorial

  6. Data Requirements • Identification Data - User, State, and County • Dimensionless Unit Hydrograph • Storm Data – for specific County/State • Sub-area Data - Name, flows to reach/outlet, area, runoff curve number, & time of concentration • Reach Data -Name, receiving reach/outlet, reach length, Manning’s “n”, friction slope, bottom width, average side slopes TR-55 Tutorial

  7. Adding Sub-areas

  8. Adding Sub-areas TR-55 Tutorial

  9. Adding Stream ReachesandDeveloping Stream Reach Data

  10. Adding Stream Reaches • WinTR-55 Main Window • Reach Data Window • Reach Flow Path Window TR-55 Tutorial

  11. County Road Upper Main Upper East Middle Main Upper West Lower East Lower Main Lower West Outlet Watershed Schematic MainStem1 WestReach EastReach MainStem2 TR-55 Tutorial

  12. WinTR-55 Main Window TR-55 Tutorial

  13. Adding Stream Reaches • WinTR-55 Main Window • Reach Data Window • Reach Flow Path Window TR-55 Tutorial

  14. Stream Reach Data • Data compiled prior to input: • Reach Name • Name of receiving (or downstream) reach (could be Outlet) • Cross-section data: • Manning’s “n” • Friction slope • Bottom Width • Average side slopes TR-55 Tutorial

  15. Reach Data Window TR-55 Tutorial

  16. Reach Data Window TR-55 Tutorial

  17. Plotted Channel Rating TR-55 Tutorial

  18. Computing Stream Reach Ratings • Manning’s Equation for Channel Flow: Q = discharge (cu ft/s) r = hydraulic radius = A/pw A = cross-sectional flow area (sq ft) pw = wetted perimeter (ft) s = slope of hydraulic grade line (channel slope, ft/ft) n = Manning’s roughness coefficient for open channel flow TR-55 Tutorial

  19. 1 D z 1 z BW TW Trapezoidal Cross-Section TR-55 Tutorial

  20. Reach Data Window TR-55 Tutorial

  21. Adding Stream Reaches • WinTR-55 Main Window • Reach Data Window • Reach Flow Path Window TR-55 Tutorial

  22. Reach Flow Path Window TR-55 Tutorial

  23. Number of sub-areas 1 - 10 Number of reaches 0-10 Types of reaches Channel or Structure Channel Reach Routing Procedure Muskingum-Cunge Capabilities & Limitations TR-55 Tutorial

  24. Modeling Watersheds with Structures Sub-area and Reach Concepts

  25. Watershed- system of sub-areas and reaches Sub-areas - watersheds that generate runoff Reaches- represent watershed flow paths (stream channels) or structures N Sub-area / Reach Concepts Sub-area A Stream Reach 2c Stream Reach 1b Outlet Structure Reach Pond Sub-area B Sub-area C TR-55 Tutorial

  26. Sub-area/Reach Concepts • Watershed - system of sub-areas and reaches • Sub-areas- generate runoff • feed into the upstream end of reaches • Reachesor Routing Elements- represent watershed stream flow paths or structures • ChannelRouting elements - Stream Reaches • StructureRouting elements - Reservoir/Structure Reaches • Watershed Outlet- downstream end of the watershed (required for all watersheds) TR-55 Tutorial

  27. Sub-area A Reach 1a(storage routing) Sub-area B Sub-areaC Reach 2c (Reach Routing) Legend: Storage Area Sub-Area Inflow Points Outlet Schematics TR-55 Tutorial

  28. Adding Structure ReachesandDeveloping Structure Data

  29. Adding Structure Reaches • WinTR-55 Main Window • Reach Data Window • Structure Data Window • Reach Flow Path Window TR-55 Tutorial

  30. WinTR-55 Main Window TR-55 Tutorial

  31. Adding Structure Reaches • WinTR-55 Main Window • Reach Data Window • Structure Data Window • Reach Flow Path Window TR-55 Tutorial

  32. Reach Data Window TR-55 Tutorial

  33. Reach and Structure could be the same Name. Naming Reaches TR-55 Tutorial

  34. Adding Structure Reaches • WinTR-55 Main Window • Reach Data Window • Structure Data Window • Reach Flow Path Window TR-55 Tutorial

  35. Structure Data Window TR-55 Tutorial

  36. Spillway Types Pipe Weir

  37. Pipe Spillway TR-55 Tutorial

  38. Straight Pipe TR-55 Tutorial

  39. Drop Inlet Pipe TR-55 Tutorial

  40. Pipe Flow Equations where: g = gravity cd =0.6 Height, feet Headpipe,feet Stage, feet Dpipe ,inches Apipe,square feet Flowpipe,cfs TR-55 Tutorial

  41. Pipe Flow Assumptions • Short-tube approximation – assumes orifice flow through the pipe at all stages • Reasonable for drop inlet configuration • May be unreasonable for large straight pipes • If not appropriate, use other routing models • SITES • WinTR-20 TR-55 Tutorial

  42. Pipe Flow Assumptions TR-55 Tutorial

  43. Spillway Types Pipe Weir

  44. Weir Spillway TR-55 Tutorial

  45. Weir Configuration TR-55 Tutorial

  46. Weir Flow Equations where: Lweir = weir length, feet Stage, feet Flowweir, cfs TR-55 Tutorial

  47. Weir Flow Assumptions • Entry of a zero weir length indicates a 90° v-notch weir • Other entry for weir length indicates a rectangular – having vertical sides - broad-crested weir TR-55 Tutorial

  48. Plotting Structure Ratings TR-55 Tutorial

  49. Structure Reach Routing

  50. Storage-Indication Routing Method • Estimates how the hydrograph changes as it flows through a structure • DStorage = (inflow - outflow) * Dt TR-55 Tutorial