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Consider the March 7, 2005 Planning Commission minutes. - page 64 / 71

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MARCH 21, 2005SHAWNEE PLANNING COMMISSION MINUTESPAGE 64

9.Small, residential-style AC units will be located on the ground on the north side of the building. Each unit location is shown to be screened with a brick enclosure to match the building.  The building will set approximately seven feet below 83rd Street, which will further restrict view of the units.

10.The storm drainage improvements required for this development shall be designed in accordance with Division 4600, Storm Drainage, of the Shawnee Manual of Technical Specifications and Design Criteria.  The enclosed and open components of the drainage system must be designed to convey the stormwater runoff from a four percent (25-year return period) design storm.  The overflow components designed to convey the runoff from a one percent (100-year return period) design storm.

a.

The applicant has submitted a preliminary storm drainage study with the site plan showing a conceptual drainage system, a drainage area map, and a drainage table summarizing the hydrologic and hydraulic analysis for the development site and all upstream tributaries.  The preliminary study is substantially complete and adequate for the purposes of reviewing the site plan although the following design issues and any additional issues discovered during the review of the site development plans must be resolved prior to the issuance of a building permit.

Given the deflection angle at drainage point 1 from drainage point 21 and the invert elevations proposed for drainage point 1, drainage point 21 must connect to a drainage structure (preferably an area inlet) downstream of drainage point 1.

The applicant needs to submit calculations to verify that the proposed runoff coefficient of 0.65 accurately reflects the correct amount of impervious area on Lot 2.

Provisions must be made for an overflow channel between drainage points 3 and 5.

The storm sewers downstream of drainage points 22 and 23 must be identified as private lines.

b.

The applicant is responsible for submitting a final storm drainage plan as an integral part of the site development plans to be submitted for a building permit.

d.

The applicant is responsible for submitting an impervious area plan as an integral part of the site development plans submitted for a building permit.  The applicant is also responsible for submitting a separate printed copy of the plan together with an electronic copy in AutoCAD © format.  The plan must accurately depict the limits of all parcels that comprise the development site and indicate the applicable Johnson County parcel identification numbers.  Use crosshatching for existing impervious areas and halftone shading for proposed impervious areas.  All existing and proposed impervious areas must be summarized in a table by parcel number.

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