Section 11-3400. INTRODUCTION TO GREEN AREA RATIO

3400.1  Green Area Ratio (GAR) is the ratio of the weighted value of landscape elements to land area.  The GAR score relates to an increase in the quantity and quality of environmental performance of the urban landscape.

3400.2   Green Area Ratio sets integrated environmental requirements for landscape elements and site design that contribute to the reduction of stormwater runoff, the improvement of air quality, and the mitigation of the urban heat island effect.

3400.3   The purposes of the GAR regulations are to:

(a) Implement a value-based system of requirements for environmental site design that provides flexibility in meeting environmental performance standards; and

(b) Promote attractive and environmentally functional landscapes.

3400.4  The purpose of this chapter is to:

(a) Provide general guidance about the regulation of GAR requirements;

(b) Define the applicability of GAR;

(c) Set forth the formula for calculating the GAR and define its component parts;

(d) Identify those landscape elements that are included in the GAR, explain how their area is measured, and set forth eligibility conditions;

(e) Establish multipliers for each eligible landscape element;

(f) Indicate what plans and certifications must accompany an application submitted to demonstrate proof of GAR compliance; and

(g) Establish maintenance requirements for the landscape elements that are provided as part of a property’s GAR requirement.

 

authority

Section 1 of the Zoning Act of 1938, approved June 20, 1938 (52 Stat. 797; D.C. Official Code § 6-641.01 (2008 Repl.)).

source

Final Rulemaking as published at 60 DCR 10077 (July 12, 2013).