D.C. Mun. Regs. tit. 10-A, § 615

E-4.1 Green Infrastructure

Effective Aug 21, 2021Authority: Comprehensive Plan Amendment Act of 2021, effective August 21, 2021 (D.C. Law 24-20; 68 DCR 006918 (July 16, 2021)). Source: District of Columbia Comprehensive Plan Act of 1984, effective April 10, 1984 (D.C. Law 5-76; 31 DCR 1049 (March 9, 1984)); as amended by District of Columbia Comprehensive Plan Act of 1984 Land Use Element Amendment Act of 1984, effective March 16, 1985 (D.C. Law 5-187; 32 DCR 873 (February 15, 1985)); as amended by District of Columbia Comprehensive Plan Amendments Act of 1989, effective May 23, 1990 (D.C. Law 8-129; 37 DCR 55 (January 5, 1990)); as amended by District of Columbia Comprehensive Plan Amendments Act of 1989 NCPC-Recommended Amendments, and Closing of Public Alleys in Square 669, S.O. 88-452, Act of 1990, effective May 23, 1990 (D.C. Law 8-132; 37 DCR 2213 (April 6, 1990)); as amended by District Government Land Use Temporary Amendment Act of 1994, effective October 1, 1994 (D.C. Law 10-190; 41 DCR 5360 (August 12, 1994)); as amended by Comprehensive Plan Amendments Act of 1994, effective October 6, 1994 (D.C. Law 10-193; 41 DCR 5536 (August 19, 1994)); as amended by District of Columbia Comprehensive Plan Act of 1984 Land Use Amendment Act of 1994, effective March 21, 1995 (D.C. Law 10-235; 42 DCR 30 (January 6, 1995)); as amended by Technical Amendments Act of 1996, effective April 18, 1996 (D.C. Law 11-110; 43 DCR 530 (February 9, 1996)); as amended by Second Technical Amendments Act of 1996, effective April 9, 1997 (D.C. Law 11-255; 44 DCR 1271 (March 7, 1997)); as amended by Comprehensive Plan Amendment Act of 1998, effective April 27, 1999 (D.C. Law 12-275; 46 DCR 1441 (February 19, 1999)); as amended by Technical Amendments Act of 1999, effective April 12, 2000 (D.C. Law 13-91; 47 DCR 520 (January 28, 2000)); as amended by Comprehensive Plan Amendment Act of 2006, effective March 8, 2007 (D.C. Law 16-300; 54 DCR 924 (February 2, 2007)); as amended by Technical Amendments Act of 2008, effective March 25, 2009 (D.C. Law 17-353; 56 DCR 1117 (February 6, 2009)); as amended by Comprehensive Plan Amendment Act of 2010, effective April 8, 2011 (D.C. Law 18-361; 58 DCR 908 (February 4, 2011)); as amended by Comprehensive Plan Amendment Act of 2021, effective August 21, 2021 (D.C. Law 24-20; 68 DCR 006918 (July 16, 2021)).District of Columbia, Office of the Secretary

615.1 GI can include a variety of construction and design techniques that conserve the natural hydrology of development or redevelopment sites. It includes small-scale practices that allow water to infiltrate, evaporate, or transpire on-site rather than flowing off and entering local storm drains and waterways. In urban areas like Washington, DC, typical GI measures include green roofs (which absorb rainwater and also reduce energy costs), porous pavement, limits on impervious surface cover, rain barrels, and rain gardens. See Figure 6.4 for more information on GI.

615.2 Figure 6.4 Green Infrastructure.

(Source: DC Water)

615.2a Text Box: Green Area Ratio

In 2013, the District adopted the GAR, an environmental sustainability zoning regulation that sets standards for landscape and site design for all new multi-family, commercial, and industrial development to help reduce stormwater runoff, improve air quality, and keep Washington, DC cooler. The purposes of the GAR regulations are to implement a points-based system of requirements for environmental site design that provides flexibility in meeting environmental performance standards, and to promote attractive and environmentally functional landscapes.

615.3 Policy E-4.1.1: Maximizing Permeable Surfaces

Encourage the use of permeable materials for parking lots, driveways, walkways, and other paved surfaces as a way to absorb stormwater and reduce runoff.

615.4 Policy E-4.1.2: Using Landscaping and Green Roofs to Reduce Runoff Promote an increase in tree planting and vegetated spaces to reduce stormwater runoff and mitigate the urban heat island, including the expanded use of green roofs in new construction and adaptive reuse, and the application of tree and landscaping standards for parking lots and other large paved surfaces.615.5 Policy E-4.1.3: GI and Engineering Promote GI and engineering practices for rainwater reclamation and wastewater reuse systems. GI practices include green roofs, bioretention facilities, permeable pavement, and rainwater harvesting. Green engineering practices include emerging wastewater treatment technologies, constructed wetlands, and purple pipe systems or other design techniques, operational methods, and technology to reduce environmental damage and the toxicity of waste generated.615.6 Action E-4.1.A: GI Criteria Support continued refinement of GI provisions for new development, such as the GAR. Explore provisions for expanded use of elements such as porous pavement, bioretention facilities, and green roofs.615.7 Action E-4.1.B: GI Demonstration Projects Continue to install retrofit demonstration projects that educate developers, engineers, designers, and the public to illustrate use of current and new GI technologies, and make the project standards and specifications available for application to other projects in Washington, DC. Such demonstration projects should be coordinated to maximize environmental benefits, monitored to evaluate their impacts, and expanded as time and money allow.615.8 Action E-4.1.C: Road Construction Standards Use District Department of Transportation's (DDOT) GI standards on all roadway reconstruction projects, with the goal of reducing stormwater pollution from roadways by minimizing impervious surface areas, expanding the use of porous pavements, and installing bioretention tree boxes and bump-outs.

SOURCE: District of Columbia Comprehensive Plan Act of 1984, effective April 10, 1984 (D.C. Law 5-76; 31 DCR 1049 (March 9, 1984)); as amended by District of Columbia Comprehensive Plan Act of 1984 Land Use Element Amendment Act of 1984, effective March 16, 1985 (D.C. Law 5-187; 32 DCR 873 (February 15, 1985)); as amended by District of Columbia Comprehensive Plan Amendments Act of 1989, effective May 23, 1990 (D.C. Law 8-129; 37 DCR 55 (January 5, 1990)); as amended by District of Columbia Comprehensive Plan Amendments Act of 1989 NCPC-Recommended Amendments, and Closing of Public Alleys in Square 669, S.O. 88-452, Act of 1990, effective May 23, 1990 (D.C. Law 8-132; 37 DCR 2213 (April 6, 1990)); as amended by District Government Land Use Temporary Amendment Act of 1994, effective October 1, 1994 (D.C. Law 10-190; 41 DCR 5360 (August 12, 1994)); as amended by Comprehensive Plan Amendments Act of 1994, effective October 6, 1994 (D.C. Law 10-193;

41 DCR 5536 (August 19, 1994)); as amended by District of Columbia Comprehensive Plan Act of 1984 Land Use Amendment Act of 1994, effective March 21, 1995 (D.C. Law 10-235; 42 DCR 30 (January 6, 1995)); as amended by Technical Amendments Act of 1996, effective April 18, 1996 (D.C. Law 11-110; 43 DCR 530 (February 9, 1996)); as amended by Second Technical Amendments Act of 1996, effective April 9, 1997 (D.C. Law 11-255; 44 DCR 1271 (March 7, 1997)); as amended by Comprehensive Plan Amendment Act of 1998, effective April 27, 1999 (D.C. Law 12-275; 46 DCR 1441 (February 19, 1999)); as amended by Technical Amendments Act of 1999, effective April 12, 2000 (D.C. Law 13-91; 47 DCR 520 (January 28, 2000)); as amended by Comprehensive Plan Amendment Act of 2006, effective March 8, 2007 (D.C. Law 16-300; 54 DCR 924 (February 2, 2007)); as amended by Technical Amendments Act of 2008, effective March 25, 2009 (D.C. Law 17-353; 56 DCR 1117 (February 6, 2009)); as amended by Comprehensive Plan Amendment Act of 2010, effective April 8, 2011 (D.C. Law 18-361; 58 DCR 908 (February 4, 2011)); as amended by Comprehensive Plan Amendment Act of 2021, effective August 21, 2021 (D.C. Law 24-20; 68 DCR 006918 (July 16, 2021)).