PLANNING FOR LOW-IMPACT DEVELOPMENT AT A MILITARY FACILITY

The Parks Reserve Forces Training Area, also referred to as Camp Parks, is an active Army Reserve training installation located in Dublin, California. The cantonment area, located in the southern portion of the installation, will be redeveloped. The proposed redevelopment includes new facilities that will result in a more dense spacing of buildings than currently exists. These redevelopment activities will impact the surface hydrology and water quality. This paper discusses the site-specific hydrologic analysis conducted to evaluate the additional stormwater runoff from proposed redevelopment activities and to provide preliminary recommendations for green infrastructure and low-impact development (LID) to retain stormwater runoff volume and replicate pre-development hydrology. LID controls considered in the hydrologic analysis for Camp Parks redevelopment areas included cisterns, permeable pavements, bio-retention areas, vegetated swales, and green roofs. These LID controls were modeled in PCSWMM to calculate the runoff volume reduction at the sub-catchment level. The total runoff volume increase resulting from the proposed redevelopment was approximately 12 MG. After adding LID controls, the total runoff volume was 5.8 MG, which equates to a runoff volume reduction of more than 50 percent if LID controls are implemented. The assumptions made in this analysis for modeling LID were conservative. Additional runoff volume retention could be attained by adding more LID controls to these sub-catchments and refining the modeling parameters with more detail and site-specific infiltration data.