Rainwater management

Intent

To reduce runoff volume and improve water quality through replicating the natural hydrology and water balance of the site, based on historical conditions and undeveloped ecosystems in the region.

Requirements

Establishment

Implement at least two of the following strategies to reduce the annual volume of rainwater runoff from the existing site’s baseline condition:

• Use Low Impact Development (LID) practices to capture and treat water from 25% of the impervious surfaces from 1.2” (30 millimeters) of rainfall;
• Disconnect 40% of existing directly connected impervious surfaces and redirect to pervious areas;
• Rainwater collection system capturing and reusing 25% of the runoff from impervious surfaces;
• Rainwater filtering system to treat water prior to release into public storm drain systems or drainage easements;
• Reconnect impervious areas to existing green infrastructure systems.

Establish an annual inspection program of all rainwater management facilities to confirm continued performance.

Performance

Employ the annual inspection program of all rainwater management facilities to confirm continued performance. Maintain documentation of inspection, including identification of areas of erosion, maintenance needs, and repairs. Perform all routine required maintenance, necessary repairs or stabilization within 60 days of inspection.