A. Stormwater management practices minimize runoff and increase infiltration, which recharges groundwater and improves water quality. Implementing stormwater best management practices into the landscape and grading design plans, to minimize runoff and to increase on-site rainwater retention and infiltration, is encouraged.
B. Project applicants shall refer to Chapter 12.16 for information on applicable stormwater technical requirements.
C. All planted landscape areas are required to have friable soil to maximize water retention and infiltration. Refer to Section 13.10.100.
D. It is strongly recommended that landscape areas be designed for capture and infiltration capacity that is sufficient to prevent runoff from impervious surfaces (i.e. roof and paved areas) from either: (1) the one inch, twenty-four-hour rain event or (2) the eighty-fifth percentile, twenty-four-hour rain event, and/or additional capacity as required by any applicable local, regional, state or federal regulation.
E. It is recommended that stormwater projects incorporate any of the following elements to improve on-site stormwater and dry weather runoff capture and use:
1. Grade impervious surfaces, such as driveways, during construction to drain to vegetated areas;
2. Minimize the area of impervious surfaces such as paved areas, roof and concrete driveways;
3. Incorporate pervious or porous surfaces (e.g., gravel, permeable pavers or blocks, pervious or porous concrete) that minimize runoff;
4. Direct runoff from paved surfaces and roof areas into planting beds or landscaped areas to maximize site water capture and reuse;
5. Incorporate rain gardens, cisterns, and other rain harvesting or catchment systems;
6. Incorporate infiltration beds, swales, basins and drywells to capture stormwater and dry weather runoff and increase percolation into the soil; and
7. Consider constructed wetlands and ponds that retain water, equalize excess flow, and filter pollutants. (Ord. 2015-11-1481 § 1 (part))