THE PLANNING PROCESS FOR LID - Low Impact Development and Sustainable Stormwater Management - page 91

Table 4-2 ( Continued )
Step 9 . Use Stormwater Calculations Methodology (Appendix A) to Design Structural
Measures
Infiltration LID Measures
• Suitable soil permeability, depth, location?
• Location of structures, impermeable pavements?
• Placement of structures to maximize infiltration systems?
• Select LID measure based on site plan?
• Revise site plan to fit infiltration opportunities?
Other Volume-Reduction LID Measures
• Vegetated roof systems possible?
• Capture/reuse possible?
• Short- and long-term maintenance?
Water Quality Only LID Measures
• Conveyance structures (inlets, chambers, filters)?
• Vegetated detention basins?
• Constructed wetlands?
Other LID Measures
• Riparian restoration?
• Woodland restoration?
Achieved Principles of LID?
• Sustain the hydrologic cycle?
• Sustain existing trees?
• Sustain the soil mantle permeability?
• No net increase in runoff volume for 2-year rainfall?
• No increase in NPS pollutant discharge?
• Volume reduction with infiltration, evapotranspiration, and/or capture/reuse?
• Minimize impervious surfaces?
• Disconnect-decentralize-distribute?
• Use vegetative systems?
• Include maintenance?
Step 10 . LID Stormwater Plan and Preliminary Site Plan
BMPs at the site. The checklist provides questions designed to facilitate the
potential application of these nonstructural BMPs. Some municipalities may want
to consider formalizing the checklist via ordinance so that applicants are required
to submit a “checklist report” which demonstrates that the applicant—and most
important, the proposed LID site plan and stormwater plan—has addressed these
questions fully.