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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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