The Massachusetts Stormwater Control Ordinance (MSC) is a regulatory framework designed to manage stormwater runoff and protect water quality in the Commonwealth of Massachusetts. It encompasses a range of rules and requirements pertaining to stormwater management practices, aimed at reducing pollution and minimizing the adverse impacts of stormwater runoff on aquatic ecosystems and public health. Under the MSC, any development project, including new construction, redevelopment, and site expansion, must comply with specific stormwater control measures to obtain necessary permits from the local authorities. The primary goal of this ordinance is to mitigate the potential negative effects of stormwater runoff, such as erosion, flooding, and the transportation of pollutants into rivers, lakes, and coastal waters. To achieve this, the Massachusetts Stormwater Control Ordinance established several types of stormwater management standards, each applying to different types of development projects: 1. Construction Stormwater Standard: This standard applies to construction projects that disturb more than one acre of land or are part of a larger common plan of development. It requires developers to implement erosion control measures, such as sediment barriers and sedimentation ponds, to prevent soil erosion and sedimentation during construction activities. 2. Post-Construction Stormwater Standard: This standard focuses on managing stormwater runoff after construction is complete. It applies to both new developments and redevelopment projects exceeding specific thresholds. The goal is to minimize the volume and rate of stormwater runoff by incorporating stormwater control measures such as infiltration systems, vegetated sales, and rain gardens. 3. Redevelopment Standard: This standard applies to projects that involve alterations or expansions of existing developed sites. The goal is to encourage the implementation of stormwater control practices during redevelopment to improve water quality and reduce the impacts of increased runoff. 4. Industrial Stormwater Standard: This standard applies to certain industrial activities, such as manufacturing plants, construction sites, and landfills. It requires the implementation of the best management practices that prevent stormwater contamination by hazardous substances, chemicals, or pollutants commonly associated with industrial activities. Compliance with the Massachusetts Stormwater Control Ordinance is typically required through permitting processes, such as the Stormwater Management Permit (SWAMP) or the National Pollutant Discharge Elimination System (NODES) permit. Local municipalities may adopt their own stormwater ordinances, augmenting the statewide regulations. By enforcing the MSC and its associated standards, the Commonwealth of Massachusetts seeks to prevent water pollution, protect natural resources, and maintain the integrity of its aquatic ecosystems. It also contributes to the fulfillment of federal water quality requirements and ensures the long-term sustainability of the state's water resources.
Massachusetts Stormwater Control Ordinance
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Depth to groundwater: At a minimum there should be a two-foot separation between bottom of structure and seasonal high groundwater. Minimum Infiltration Rate. 0.17 inches per hour.
Examples of stormwater treatment practices include source reduction, sand filters, infiltration basins and trenches, rain gardens (bioretention), dry ponds, wet ponds, constructed wetlands, filter strips, swales, wet vaults, and underground sedimentation practices.
Manage stormwater to control erosion and flooding. Acquire and protect natural waterways so that they can be rehabilitated. Build ponds, swales, or wetlands (often referred to as soft structures) to work with pipes, channels, and other drainage structures (often referred to as hard structures).
A Site Based Stormwater Management Plan (SBSMP) is a broad outline for planning, design, management and maintenance of stormwater quantity and quality management measures during construction, 'on' and 'off' maintenance and operational phases of a development.
Stormwater management is the control and use of storm- water runoff. It includes planning for runoff, maintaining stormwater systems, and regulating the collection, storage, and movement of stormwater. Stormwater management also considers drainage in the design of cities and housing developments.
The Municipal Separate Storm Sewer System (MS4) General Permit: for most cities and towns in Massachusetts, to operate municipal stormwater systems. More information on EPA Region 1's and MassDEP's MS4 General Permit.
The purpose of a Stormwater Management (SWM) Report is to. identify the rate, quantity and quality impacts of stormwater discharge on existing infrastructure and/or downstream receivers, due to a change in existing conditions.
What can you do to reduce the runoff from your property? Disconnect/Redirect Downspouts. Use a rain barrel to capture rain from your roof. Plant a rain garden. Plant trees. Reduce impervious surfaces; permeable pavement. Plant a green roof.