Broken Arrow Municipal Authority
Meeting of: 10-18-16
To: Chairman and Trustees
From: Broken Arrow Floodplain Administrator
Title:
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Presentation, discussion, and possible action on a Variance Request from the Stormwater Management Ordinance Section 25-313(6) for the Countyline Crossings development from Walmart Real Estate Business Trust, for property located in the area of Dearborn Street and North 23rd Street
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Background:
Cochran Engineering has been preparing development plans and the plat for the Countyline Crossings development at the northeast corner of Dearborn Street and North 23rd Street. A portion of the proposed platted area is within the Spunky Creek Zone AE FEMA 100-year floodplain. Onsite stormwater detention is required for the proposed multiple lot commercial development. The required stormwater detention facility is proposed to have a portion of it constructed within the 100-year floodplain boundary of the overbank of Spunky Creek. Construction of the detention facility would have a built up dry detention pond embankment within the floodplain and compensatory floodplain storage cut on the downstream side of the pond to meet City of Broken Arrow floodplain code requirements.
The proposed pond grading would change the boundary of the current 100-year floodplain, prompting requirement of a FEMA Letter of Map Revision based on Fill (LOMR-F). The limits of both the current and proposed 100-year floodplain boundaries would be contained within a stormwater drainage easement on the final plat and would not directly affect development lots. Broken Arrow Stormwater Management Ordinance Section 25-313(6) states "The final plat of any development requiring a FEMA LOMR will not be accepted until such LOMR is approved in writing by FEMA. Building permits will not be issued on any lots in developments awaiting LOMR approval." The enclosed letter requests a variance from this ordinance to allow the filing of the Final Plat for Countyline Cross...
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