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Using the IMP Sizing Calculator

Using the IMP Sizing Calculator. Dan Cloak, P.E. Principal Dan Cloak Environmental Consulting. Topics. Resources Approach and Sizing Equations Example Project Practice Session. Resources. Stormwater C.3 Guidebook (4 th Edition) October 2009 Supplement Design sheets for two new IMPs

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Using the IMP Sizing Calculator

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  1. Using the IMP Sizing Calculator Dan Cloak, P.E.PrincipalDan Cloak Environmental Consulting

  2. Topics • Resources • Approach and Sizing Equations • Example Project • Practice Session

  3. Resources • Stormwater C.3 Guidebook (4th Edition) • October 2009 Supplement • Design sheets for two new IMPs • Sizing factors and equations for all IMPs • IMP Sizing Calculator Help File • IMP Sizing Calculator • Example Design

  4. Sizing IMPs Manually

  5. Factors and Equations

  6. Help File • Background on IMPs and Sizing • Preliminary LID Design • How to Enter Project Information • Project Name, Location, Total Area • Drainage Management Areas • Integrated Management Practices • Saving and Opening Projects • Using the Calculator as a Design Aid

  7. Example Project Commercial development at the base of a slope

  8. J-ditch Retaining Wall LS-1 537 SR-2 2,320 Ridgeline B1 1,950 Pave2 GB GB SR-1 Roof2 550 700 550 Pave1 11,600 2,750 Roof1 Roof4 Pave3 2,788 2,690 Roof3 700 B4 GB Pave4 2,310 GB B2 B3 ST-1

  9. J-ditch Retaining Wall LS-1 537 SR-2 2,320 Ridgeline B1 1,950 Pave2 GB GB SR-1 Roof2 550 700 550 Pave1 11,600 2,750 Roof1 Roof4 Pave3 2,788 2,690 Roof3 700 B4 GB Pave4 2,310 GB B2 B3 ST-1

  10. J-ditch Retaining Wall LS-1 537 SR-2 2,320 Ridgeline B1 1,950 Pave2 GB GB SR-1 Roof2 550 700 550 Pave1 11,600 2,750 Roof1 Roof4 Pave3 2,788 2,690 Roof3 700 B4 GB Pave4 2,310 GB B2 B3 ST-1

  11. J-ditch Retaining Wall LS-1 537 SR-2 2,320 Ridgeline B1 1,950 Pave2 GB GB SR-1 Roof2 550 700 550 Pave1 11,600 2,750 Roof1 Roof4 Pave3 2,788 2,690 Roof3 700 B4 GB Pave4 2,310 GB B2 B3 ST-1

  12. J-ditch Retaining Wall LS-1 537 SR-2 2,320 Ridgeline B1 1,950 Pave2 GB GB SR-1 Roof2 550 700 550 Pave1 11,600 2,750 Roof1 Roof4 Pave3 2,788 2,690 Roof3 700 B4 GB Pave4 2,310 GB B2 B3 ST-1

  13. Exercises • Identify and execute one or more solutions to the B3 warning that involve changing the connectivity of drainage areas to IMPs. • Identify and execute one or more solutions to the B2 warning that involve changing IMP types.

  14. Solution to Exercise #1 • Remove grade break and redesign grading • Redirect runoff from DMAs ROOF-3 and PAVE-4 to IMP B4

  15. J-ditch Retaining Wall LS-1 537 SR-2 2,320 Ridgeline B1 1,950 Pave2 GB GB SR-1 Roof2 550 700 550 Pave1 11,600 2,750 Roof1 Roof4 Pave3 2,788 2,690 Roof3 700 B4 GB Pave4 2,310 GB B2 B3 ST-1

  16. Solution to Exercise #2 • Change IMP B2 type to Bioretention + Vault

  17. J-ditch Retaining Wall LS-1 537 SR-2 2,320 Ridgeline B1 1,950 Pave2 GB GB SR-1 Roof2 550 700 550 Pave1 11,600 2,750 Roof1 Roof4 Pave3 2,788 2,690 Roof3 700 B4 GB Pave4 2,310 GB B2 B3 ST-1

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