HomeMy WebLinkAboutBPW 042110 Paperless PacketCl Y OF CARMEL
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DIANA L. CORDRAY, CLERK TREASURER
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April 2, 2010
Board of Public Works & Safety
One Civic Square
Carmel, Indiana 46032
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CITY OF ARMEL
JAMES BRAINARD, MAYOR
RE: Blackwell Park Subdivision — Storm Water Technical Standards Variance
Dear Board Members:
Mr. Gregory Ilko of CrossRoad Engineers, P.C., on behalf of Mr. Justin W. Moffett, Uptown Partners, LLC,
developer of Blackwell Park Subdivision, is requesting a variance from Section 302.08 (1) of the City's
Storm Water Technical Standards Manual that requires, among other things, that "Provisions shall be
incorporated into facilities for complete interior drainage of dry bottom facilities, including a
minimum 1% bottom slope in all directions if tile underdrains are provided and a minimum of 2% if no
underdrains are provided. A positive /gravity outlet is required for the underdrains in all dry- bottom
detention facilities."
The petitioner is requesting a variance from this requirement based on the provided information:
",.....the proposed dry basin is being constructed within a wetland area and we would like to preserve as
much of the aesthetics as possible. Constructing a 2% bottom slope, or installing underdrains with a 1%
slope, within the existing wetland will damage the existing foliage and plant life." (Exhibits attached)
To address the flat slope condition, the area outside of the wetland area will be planted with a selection
of prairie grasses and wet habitat species, so as to better handle the possible condition of saturation of
the soil along the bottom of the basin in this area. Selection of these plantings will be made by Spence
Restoration Nursery and the developer.
Reduction of slope within the base of the stated detention area will not affect the hydraulic operation of
the detention area.
Because of plant selections being made, the runoff generated from the property will realize additional
treatment due to the constructed wetland.
The Department recommends that the Board approve the requested variance from Section 302.08 (1) of
the City's Stormwater Technical Standards Manual.
cerely,
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City Engineer
Enclosures
\ \IssuraaaSl \user data\ shared\ DHill\ BPW10\ BLACKWELLPARKSTORMWATERVAR IANCE.DOC
DEPARTMENT OF ENGINEERING
ONE CIVIC SQUARE, CARNIEL, IN 46032 OFFICE 317.571.2441 FAx 317.571.2439
EMAIL engineeringQcarmehn.gov
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