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Grading Plans - 06/21/2023
Grading/Stormwater Plan Accepted (Building Permit Released) Accepted by: sagenbroad Date: 06/21/2023 B2209035 & B2209037 Memorandum T0: FROM: DATE: PROJ ECT: HDS 106 NO SU BJ ECT: Fort Collins Utilities - Engineering Barry Schram — Lamar Construction Jason Claeys, P.E. 4/21/23 1316 Whedbee Street 22-1063-00 Drainage Summary HIGHLAND D=� _� �.�;�_ . �,,.T seRv�cEs This memo has been prepared to describe the existing conditions at 1316 Whedbee Street and the drainage impacts of the proposed changes in impervious area. Below is a vicinity map showing the general location of the property: � f� � - � � � F � ,� a 'n N r:! � � � � Buckeye St i�.. =4� F� � The property is approximately 13,500 sq ft (0.31 acres) and is located in Fort Collins, south of E. Pitkin Street and along the east side of Whedbee Street. Single-family residences are adjacent to the north and south and a public alley along the east. The existing single-family residence is located toward the west Highland Development Services, Inc. 6355 Fairgrounds Avenue, Suite 100 � Windsor, CO 80550 � 970.674.7550 1316 Whedbee Street 4/14/23 Page 2 of 2 side of the lot. The house and all existing sidewalks are proposed to be removed and replaced with a new house with an attached garage and detached accessory building. The lot is located not located within the City or FEMA defined floodplain/floodway. Based on a topographic site survey, it appears approximately 4,100± sqft of the lot drains west to Whedbee Street (Basin EX1), with approximately 9,400± sqft drains east to the public alley (Basin EX2). Generally, the existing property is relatively flat. The proposed improvements will direct drainage away from the proposed residence and the adjacent properties. The proposed grading directs approximately 7,400± sqft west to Whedbee Street (Basin PR1), and approximately 6,100± sqft draining east to the public alley (Basin PR2). Runoffwill be mainly conveyed via grass swales and a 12" concrete pan (located along the north side of the proposed residence). The proposed grading is able to reduce the impervious area currently draining to the alley and will not adversely affect neighboring properties. The difference in basin size and impervious areas between the existing and proposed improvements is shown below: Apaved Aroof Awalk Agravel Alawn Weighted Sub-bdsin Atotal Atotal (sq feet) (sq feet) (sq feet) (sq feet) (sq feet) /o Designation (sq feet) (acres) 100% 90% 90% 40% 0% �mpervious EX1 4,122 0.095 1,253 764 235 0 1,870 52.2% EX2 9,378 0.215 0 1,039 1,162 1,358 5,819 26.9% Existing Total 13,500 0.310 1,253 1,803 1,397 1,358 7,688 34.6% PR1 7,424 0.170 570 3,132 0 0 3,721 45.7% PR2 6,076 0.139 0 745 513 106 4,712 193% Proposed 13,500 0310 570 3,877 513 106 8,433 33.8% Total Below is a summary of change in impervious for the overall lot: Total Area Roof Area Paved Area Walk Area Total Impervious Description (sqft) (sqft) (sqft) (sqft) Area (sqft) Total Basin Summary Existing 13,500 1,803 1,253 1,397 4,454 Proposed 13,500 3,877 570 513 4,961 Difference 0 2,074 -683 -884 507 Alley Basin Summary Existing 9,378 1,039 0 1,162 2,201 Proposed 6,076 745 0 513 1,258 Difference -3,302 -294 0 -649 -943 There is approximately 500± sqft of impervious area added with the proposed improvements. The majority of the proposed impervious area drains across lawn and landscape areas prior to draining offsite. Majority of the improvements are considered disconnected impervious area, reducing impact to stormwater runoff quality. 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