(14)   Stormwater Management. 638
For properties that contain at least 15,000 sq. ft. of lot area, the stormwater management bonus may be earned as provided by this subsection. Within the /ECO overlay district, a stormwater management bonus may be earned by (1) providing a stormwater open space, (2) managing street drainage, or (3) providing both stormwater open space and managing street drainage. Open space provided to earn a height bonus that meets the requirements of § 14-702(14)(a) (Criteria for Open Space within the /ECO overlay district) shall count towards the required open area, but shall not be used to satisfy the bonus requirements of § 14-702(6) (Public Space). Within the /CDO overlay district a stormwater management bonus may be earned by (1) managing additional street drainage, (2) managing additional on-site stormwater runoff, (3) managing additional street drainage or additional on-site stormwater runoff in a surface feature, or (4) meeting the requirements for more than one of these three options.
(a)   Criteria for Open Space within the /ECO Overlay District.
Within the /ECO overlay district, a height bonus may be earned by providing open space that manages stormwater runoff, provided that the space meets the following minimum standards:
(.1)   The stormwater open space shall be located within 20 ft. of Willow Street, but may be contiguous to other integrated surface stormwater management systems.
(.2)   The stormwater open space shall account for at least seventy-five percent (75%) of the lot area located within 20 ft. of Willow Street.
(.3)   The stormwater open space shall be at least seventy-five percent (75%) vegetated or landscaped.
(.4)   The stormwater open space shall not be more than 3 ft. above or 3 ft. below ground level.
(.5)   The stormwater open space shall be open to the sky, except for arbors, trellises, trees, seating, and landscaped areas.
(.6)   At least fifteen percent (15%) of the stormwater open space shall be publically accessible. In order to qualify as publicly accessible, the space must:
(.a)   Include walkways, seating areas, water features, or other publicly accessible elements;
(.b)   Be open to the public at least during the hours of 8:00 a.m. to 9:00 p.m., daily; and
(.c)   Have lighting with a maximum height of 15 ft. and a minimum illumination level of 2.0 maintained foot candles. One light shall be provided for every 500 sq. ft. of public space. Lighting design shall be subject to the requirements of § 14-707 (Outdoor Lighting).
(.7)   The stormwater open space shall not be used for parking, loading, or vehicle movements, or for vehicles to access areas used for parking, loading, or other vehicle movements.
(.8)   Stormwater runoff shall be managed with an integrated surface stormwater management system that includes surface features for stormwater management, promotes infiltration of stormwater runoff to the maximum degree feasible, and provides for stormwater runoff storage when infiltration is not feasible. Any on-site stormwater runoff that cannot be managed in the stormwater open space shall be managed in additional on-site stormwater management systems.
(b)   Criteria for Managing Street Drainage within the /ECO Overlay District or the /CDO Overlay District. 638.1
Within the /ECO overlay district or /CDO overlay district, a height bonus may be earned by managing the street drainage through the installation and maintenance of one or more stormwater management systems on the property, provided that the stormwater management system maximizes the management of adjacent street drainage and manages at least 5,000 sq. ft. of impervious street drainage area in excess of applicable stormwater management requirements.
(c)   Criteria for Managing Additional On-Site Stormwater within the /CDO Overlay District.
Within the /CDO overlay district, a bonus may be earned by installing and maintaining one or more stormwater management systems on the property, provided that the stormwater management system maximizes on-site stormwater management and manages at least 5,000 sq. ft. of additional stormwater runoff from the property's impervious area in excess of applicable stormwater management requirements.
(d)   Criteria for Managing Additional Street Drainage and/or Additional On-Site Drainage in a surface feature within the /CDO Overlay District.
Within the /CDO overlay district, a bonus may be earned by installing and maintaining a stormwater management system that manages additional street drainage or additional on-site drainage (as defined in (b) and (c)) in a surface feature in accordance with Water Department requirements.
(e)   Criteria for All Stormwater Management Bonuses.
In addition to the above criteria, all open space and stormwater management systems provided to earn a stormwater management bonus shall meet the following standards:
(.1)   The Water Department shall confirm that all stormwater management systems meet the applicable stormwater management requirements of this § 14-702(14) and all other applicable stormwater management requirements.
(.2)   The applicant shall execute and record a deed restriction against the property, approved as to form by the Law Department, which requires the stormwater management systems to be constructed and maintained, at a minimum, in accordance with the Water Department's stormwater management requirements for the life of the building; and which allows the City to inspect for, or demand proof of, continued compliance with those requirements. 638.2
(f)   Bonus Building Height.
The additional building height earned by providing certain stormwater management systems is:
 
Open Space Management Requirements
Additional Building Height
/ECO
/CDO
The stormwater open space meets the requirements of
§ 14-702(14)(a) and § 14-702(14)(e)
24 ft.
N/A
Street Drainage Management Requirements
Additional Building Height
/ECO
/CDO
The stormwater management system meets the requirements of § 14-702(14)(b) and § 14-702(14)(e)
12 ft. for every 20% of street drainage area managed, up to a maximum of 48 ft.
12 ft.
Additional On-Site Management Requirements
Additional Building Height
/ECO
/CDO
The stormwater management system meets the requirements of § 14-702(14)(c) and § 14-702(14)(e)
N/A
12 ft.
Surface Feature Requirements
Additional Building Height
/ECO
/CDO
The stormwater management system meets the requirements of § 14-702(14)(d) and § 14-702(14)(e)
N/A
12 ft.
 

 

Notes

638
   Added, Bill No. 150505 (approved December 1, 2015); amended, Bill No. 160526 (approved June 28, 2016); amended, Bill No. 190811-A (approved December 30, 2019).
638.1
   Amended, Bill No. 200628 (approved March 29, 2021).
638.2
   Amended, Bill No. 200628 (approved March 29, 2021).