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WinTR-55 Small Watershed Hydrology

WinTR-55 Small Watershed Hydrology. Intermediate WinTR-55 Training Modeling Watersheds with Structures. Course Outline. Intermediate WinTR-55 Training Modeling Structures Entering structure data Interpreting Output. Lesson Objectives. Upon completion of this lesson, you will be able to:

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WinTR-55 Small Watershed Hydrology

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  1. WinTR-55Small Watershed Hydrology Intermediate WinTR-55 Training Modeling Watersheds with Structures

  2. Course Outline Intermediate WinTR-55 Training • Modeling Structures • Entering structure data • Interpreting Output WinTR-55 Structures

  3. Lesson Objectives Upon completion of this lesson, you will be able to: • Describe the relationship between structures, stream reaches and sub-areas in the modeling process • Develop input data for watersheds with structures • Input structure data into WinTR-55 • Run WinTR-55 • Interpret Output WinTR-55 Structures

  4. ReviewSub-area and Reach Concepts

  5. 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 1s Sub-area B Sub-area C WinTR-55 Structures

  6. 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) WinTR-55 Structures

  7. Sub-area A Reach 1a(storage routing) Sub-area B Sub-area C Reach 2c (Reach Routing) Legend: Storage Area Sub-Area Inflow Points Outlet Schematics WinTR-55 Structures

  8. Adding Structure ReachesandDeveloping Structure Data

  9. Adding Structure Reaches • WinTR-55 Main Window • Reach Data Window • Structure Data Window • Reach Flow Path Window WinTR-55 Structures

  10. WinTR-55 Main Window WinTR-55 Structures

  11. Adding Structure Reaches • WinTR-55 Main Window • Reach Data Window • Structure Data Window • Reach Flow Path Window WinTR-55 Structures

  12. Reach Data Window WinTR-55 Structures

  13. Naming Reaches WinTR-55 Structures

  14. Adding Structure Reaches • WinTR-55 Main Window • Reach Data Window • Structure Data Window • Reach Flow Path Window WinTR-55 Structures

  15. Structure Data Window WinTR-55 Structures

  16. Spillway Types Pipe Weir

  17. Pipe Spillway WinTR-55 Structures

  18. Straight Pipe WinTR-55 Structures

  19. Drop Inlet Pipe WinTR-55 Structures

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

  21. 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 WinTR-55 Structures

  22. Pipe Flow Assumptions WinTR-55 Structures

  23. Spillway Types Pipe Weir

  24. Weir Spillway WinTR-55 Structures

  25. Weir Configuration WinTR-55 Structures

  26. Weir Flow Equations where: Lweir = weir length, feet Stage, feet Flowweir, cfs WinTR-55 Structures

  27. 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 WinTR-55 Structures

  28. Plotting Structure Ratings WinTR-55 Structures

  29. Questions?

  30. Structure Reach Routing

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

  32. Structure Reach Routing WinTR-55 Structures

  33. Structure Routing Plot WinTR-55 Structures

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

  35. Reach Flow Path WinTR-55 Structures

  36. Questions?

  37. Capabilities and Limitations

  38. Structure Routing Storage-Indication Structure Types Pipe or Weir Structure Trial Sizes 1-3 Capabilities & Limitations WinTR-55 Structures

  39. Entering Data, Running the Program and Interpreting Output Demonstration Problem #4 Watershed with Pipe Structure

  40. Demonstration Problem #4 • Assume development in Sub-area A • 10- & 100-year peak at Sub-area A for the developed condition must be no greater than the 10- & 100-year peak for the existing condition • Size a detention pond to meet this requirement • A straight pipe spillway is selected WinTR-55 Structures

  41. Culvert Reach 2c Reach 1b Demonstration Problem #4 C Detention Pond B A WinTR-55 Structures

  42. Sub-area Data Location: Williamson County, Illinois WinTR-55 Structures

  43. Stream Reach Data Location: Williamson County, Illinois WinTR-55 Structures

  44. Structure Reach Data Height from pipe invert at outlet to spillway crest: 5.5 feet Pond surface 5’ above spillway crest = 1.3 acres Distance = 5 ft Pond surface at spillway crest = 0.5 acres Height = 5.5 ft WinTR-55 Structures

  45. Sub-area A – Peak Discharges • From Demonstration Problems 1 and 2, qpeak for the 2-, 10- and 100-year storms from sub-area A were as follows: WinTR-55 Structures

  46. Legend: Storage Area Sub-Area Inflow Points Sub-area C Reach 2c Reach 1b Sub-area B Schematic Outlet Reach 1s Sub-area A WinTR-55 Structures

  47. Adding Structure Reaches • WinTR-55 Main Window • Reach Data Window • Structure Data Window • Reach Flow Path Window WinTR-55 Structures

  48. WinTR-55 Main Window WinTR-55 Structures

  49. Reach Data Window WinTR-55 Structures

  50. Structure Data Window WinTR-55 Structures

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