UFC 3-210-10
25 October 2004
case, as with many retrofits, the goal is to improve stormwater quality generally rather
than to meet a specific load reduction goal. Quantity control is not required because the
site outfall is located near the outlet of the watershed of a major watercourse and the
facility's storm drain network has adequate capacity.
10-1.2
RANK AND PRIORITIZE OPPORTUNITES. For this project, retrofit
opportunities will be ranked and prioritized according to the following criteria:
Greatest potential to reduce non-point source pollutant loads
Minimal costs for new structures or materials
Minimal disturbance and ability to integrate construction into storm drain
repair
Minimal maintenance cycles
Minimal maintenance costs and training
Ancillary benefits (landscaping, energy conservation, water conservation)
10-1.3
SITE CONDITIONS. The site has minimal topographic relief. The
groundwater table is approximately 3 feet (0.91 m) below the surface elevation. The
soils in the area are fill soils with poor infiltration rates. The site is fronted by a
landscaped buffer along the access road. There is an existing drainage system below
the buffer. The adjacent parking area has several mature trees and drains towards the
landscape buffer area. Figure 10-1 is a picture of the landscaped area taken from the
parking area. Several yard inlets are located in the parking areas and along the access
road. Figure 10-2 is a picture of a drainage inlet that has a concrete pilot channel to
help collect runoff from the parking areas.
Figure 10-2. Drainage Inlet
Utility maps, topographic maps, and aerial photography were gathered and a
site visit was conducted. Drainage patterns were verified during the site visit.
(Drainage areas and patterns found in the field often deviate from those shown on plans
because of changing field conditions, new utilities, repairs, or inaccuracies in the data.)
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