Agenda - Council - 02/25/2003 - Laserfiche WebLink

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Preliminary Plat: The Village of Sunfish Lake January 31,2003, Revised February 21, 2003 Page 3 of 7 All of the above street widths Will be measured from back of curb to back of curb.. Intersection radiuses shall be a minimum of 25 feet to accommodate the turning movements of large emergency vehicles. .. I I I I I I I I I I I I I I Lot Size and Dimensions: Current regulations require that urban single family homes be located on lots of at least 10,800 square feet in size: The proposed development shows single-family homes being located on lots ranging from 5,460 to 8,500 square feet: In the pursuit of creating a "new urbanist" neighborhood, staff finds these lots sizes acceptable, for this particular development. However, ultimately a determination by the City Council will need to be made on whether these deviations from City Code are acceptable. Grading and Drainage: The drainage and grading plan submitted d'ivides the development into three distinct basins. The northern portion of the development drains overland and through storm sewers to a detention pond which is located adjacent to the south side of Sunwood Dr. A strip of the plat along the. eastern b. Order drains overland to a natural wooded depression which extends into the rear yards, of Chestnut Ridge 3rd Addition. The. contributing drainage area to this existing depression has been significantly reduced in size from the original drainage plan dated January 15, 2003. The remaining and largest portion of the plat drain overland and through storm sewers to a two,cell detention pond: located in the southwest comer of the site. The overflow from this pond would discharge through an existing storm sewer into Sunfish Lake. The north pond outlets-to a storm sewer in-Sunwood Drive which discharges to Wetland 114P which then outlets to the Rum River. This pond mUst be designed to accommodate a 100-year storm event which has been show to be at the 868.4 elevation On the latest calculations submitted by the developer. The lot grades surrounding this pond are ail' higher than the required two-foot above flood elevation that is reqUired. A 100-year backyard ponding analysis must be performed for the backyard ponding asSoCiated with. the lots between Streets B and C. The natural wooded depression on the east side of the plat outlets through an existing storm: se~er located on 146th Ave. and discharges into Wetland' 114P. The-100-year high water elevation has been calculated' by the developer to be at the 866.7 elevation. The proposed house pads within the proposed subdivisions are all two feet higher than this elevation; however the existing house at 6001146th Ave. is only 1.8 feet above the I00-year high water level. Additionally, an analysis showing the impact on the development on' this natural depression is still being reviewed. " The ponds in the southwest portion of the-plat Overflows to- Sunfish Lake which has not outlet presently. Due to the lack of an outlet, this pond must be designed to 'accommodate back to back 100 year precipitation events which is calculated to. be at the 866.43 elevation. This elevation will require that the proposed lots southwest of Street A be raised 0.4 feet from the proposed elevation. This elevation would also resolve the flooding in the backyard at 617l 145th Lane. More precise topographical information will need to be provided for this lot since the lookout elevation is shown to be 870.1 feet, however an 866 contour is shown to run through to comer of the house pad. -217-