Currently, bioretention constructions are the preferred best management practice for small sites. In highly urbanized areas a greater degree of hydraulic control may be prescribed. To employ the proper bioretention hydraulics, professionals such as engineers, architects, property owners,
municipal officials, and contractors may be employed to prepare engineering plans, design and/or review SWM/SWQ systems, conduct water quality inspection and observation, install and maintain bioretention basins, and try to understand the expectations and maintenance of the surface runoff. These individuals will also inspect the operation of the bioretention construction.
Bioretention Design and Construction
Guidelines for bioretention design and construction can be found at the websites for the EPA, the Department of Natural Resources for each state, or on some of the links listed below. In most cases, these guidelines also specify the planting soil mix, specifying the coefficient of permeability recommended locally as well as the EPA recommended k value. Soil providers should be able to describe the make up of their bioretention soil mix and provide proof of certification. Moon Nurseries is a certified provider of bioretention soil, listed in the DNREC official website and documentation.
When constructing bioretention facilities, in addition to specifying plants which can tolerate saturated conditions, specify plants which add aesthetic value to the property. Ensure plantings are taking and growing, since plant roots provide for much of the pollutant removal. Reports advise that we should consider the bioretention basin is working properly when there is no standing water and plants are healthy and growing.