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Stormwater Bylaws Toolkit

This toolkit displays model bylaws and regulations that MAPC has created in partnership with six communities in the region. The links provided below are to both drafts and final versions of bylaws and regulations. In many cases, MAPC provided drafts up to a point, and the municipalities did the final edits during the adoption/approval process. […]

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Fact Sheet: Infiltration Trenches and Dry Wells

Infiltration trenches and dry wells are standard stormwater management structures that can play an important role in Low Impact Development site design. Dispersed around the site, these infiltration structures can recharge groundwater and help to maintain or restore the site’s natural hydrology. This approach contrasts with conventional stormwater management strategies, which employ infiltration as a […]

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Fact Sheet: Low Impact Site Design

Conventional development strategies treat stormwater as a secondary component of site design, usually managed with “pipe-and-pond” systems that collect rainwater and discharge it off site. In contrast, Low Impact Development embraces hydrology as an integrating framework for site design, not a secondary consideration. Existing conditions influence the location of roadways, buildings, and parking areas, as […]

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Fact Sheet: Vegetated Swales

Vegetated swales are an important Low Impact Development technique used to convey stormwater runoff. These open, shallow channels slow runoff, filter it, and promote infiltration into the ground; as a result, runoff volumes are smaller, peak discharge rates are lower, and runoff is cleaner. This approach contrasts with conventional stormwater strategies that rely on gutters […]

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Shared Parking

Parking Spaces Serving Multiple Masters Shared parking means that a parking facility serves multiple destinations. This requires multiple destinations within walking distance of the same parking facility, and is most effective when those destinations either share patrons, so that people park once and visit multiple destinations, or have different periods when parking demand is highest. […]

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Local Examples: Compact Car Spaces

Local Examples: Compact Car Spaces Local Example – Marlborough, MA: Compact Car Spaces City of Marlborough Zoning By-Law, §200-25 Off-Street Parking. C. Location and Layout of Parking Facilities. (3) [amended 4-23-90 by Ord. No. 89/90-3111] Full-size Parking Dimensions. The minimum dimensions of full-size parking stalls and aisles shall be as indicated in the Table of […]

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LID Frequently Asked Questions

What is Low Impact Development? Low Impact Development is a way to protect the environment and reduce construction costs at the same time. Conventional design and construction methods generally use expensive systems of curbs, gutters, pipes, and ponds to collect and treat runoff. In contrast, the Low Impact Development approach uses a more decentralized approach; […]

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Fact Sheet: Roadways and Parking Lot Design

One of the simplest ways to cut down on stormwater runoff is to reduce the amount of impervious cover associated with roadways and parking lots. Careful design is the key to reducing pavement while still providing good site access and adequate parking. Good road and parking lot design can also create opportunities for decentralized stormwater […]

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Fact Sheet: Green Roofs

A green roof is a low-maintenance vegetated roof system that stores rainwater in a lightweight engineered soil medium, where the water is taken up by plants and transpired into the air. As a result, much less water runs off the roof, as compared to conventional rooftops. Green roofs have been in use in Europe for […]

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Fact Sheet: Grass Filter Strips

Grass filter strips are low-angle vegetated slopes designed to treat sheet flow runoff from adjacent impervious areas. Filter strips (also known as vegetated filter strips and grassed filters) function by slowing runoff velocities, filtering out sediment and other pollutants, and providing some infiltration into underlying soils. Because they use sheet flow and not channelized flow, […]

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