Stormwater Management

GZA’s stormwater management services include Civil and Site Engineering Design; Drainage Studies and Design; Hydrologic and Hydraulic Modeling; Pollutant Loading and TMDL Assessments; Stormwater Pollution Prevention Plans (SWPPP); Stormwater Management Plans, including Best Management Practices (BMPs); Erosion and Sedimentation Control Plans; NPDES Stormwater Permitting and Compliance; and Municipal Separate Storm Sewer Systems (MS4). 

GZA specializes in low impact site design, including water quality treatment using natural and nature-based systems, porous pavement, etc., and GZA’s stormwater management designs meet LEED certification requirements.  GZA’s stormwater analyses include runoff volume calculations, sizing of stormwater systems, pollutant loading systems and discharge effluent concentrations. GZA also performs stormwater sampling and provides construction support including permitting, development of BMP Operation and Maintenance Plans, construction certification and construction management.