Most Appropriate Uses - ufc_3_210

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UFC 3-210-10

25 October 2004

Figure 8-2. Bioretention Area

GROUNDWATER RECHARGE FACILITY

In-situ soils should have a high

infiltration rate (at least 1"/hr).

Soil filter depth should be at

least 2.5'.

runoff

soil filter

existing

mix

soil

recharge

Source: PGDER.

8-3.1

Most Appropriate Uses. Bioretention features are used to treat stormwater

that has run over impervious surfaces in commercial, residential, and industrial areas.20

Use of bioretention for stormwater management is ideal for median strips, parking lot

islands, and swales.

8-3.2

Cost Data. Construction cost estimates for a bioretention area are slightly

greater than for required landscaping at a new development.21 Commercial, industrial

and institutional site costs range between 7 and 0 per square meter ( and

per square foot,) based on the need for control structures, curbing, storm drains

and underdrains.

8-3.3

Maintenance Issues. Routine maintenance should include a biannual health

evaluation of the trees and shrubs and subsequent removal of any dead or diseased

vegetation.22 This maintenance can be incorporated into regular maintenance of the

site landscaping. If the bioretention feature is located in a housing development, the

maintenance responsibility could be delegated to the residents. The use of native plant

species in the bioretention cell will reduce fertilizer, pesticide, water, and overall

maintenance requirements.

8-3.4

Corrective Actions. Treat diseased vegetation as needed using

preventative and low-toxic measures. When levels of pollutants reach toxic levels that

impair plant growth and the effectiveness of the BMP, soil replacement may be

EPA, 1999a.

Ibid.