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HomeMy WebLinkAboutGrading Plans - 08/10/2018�CTL I THOMPSON � ?:.� � -t � ��--�- ' `' �:- � ' �� August 10, 2018 H3 Construction and Design 102 South Saint Louis Avenue Loveland, Colorado 80537 COM 410 FT N OF SE COR OF BLK 282, WEST SIDE ADDTN, FTC, N 45 FT, W 180 FT, S 45 FT, E 180 FT TO BEG B1803888 & B1803889 Accepted and permits released 8/10/2018 DJM Attention: Mr. Tim Rehnstrom Subject: Drainage Memo 233 North Loomis Avenue Fort Collins, Colorado Project No. WY01615.000-500 Dear Mr. Rehnstrom, The above referenced lot has historically drained from west to east with some front lot drainage flowing to the north across the adjacent property driveway. This lot has slopes ranging from 1.5% to 3.0% for a majority of the lot with some steeper slopes at the front of the lot that range in the 7.0% to 11.0%. The original house had an approximate square footage of 1021 sf with approximately 57 sf of sidewalk. As part of a proposed addition/remodel, 136 sf of this original will be removed with a 1145 sf addition added on. There will also be a 656 sf detached garage added to the site. This increases the impervious surface area by 2743 sf or 154%. A drainage plan is required for this increase in impervious area. Attached is a drainage plan that includes drainage around the existing and proposed new structures. This drainage plan still conducts water away from the existing and proposed structures and directs the drainage water in the same direction as it has historically flowed. Drainage from between the house addition and the garage will be swaled around the west side of the house and directed down the north and south sides of the house. Swales will be cut in between the house and the property lines on the north and south sides to direct a majority of the drainage to the east side. The north side swale will terminate at the neighboring drive way and drain across it to the street. The new drainage patterns should not have any adverse impacts on the adjacent properties. We recommend that any new downspouts on the residence be installed to discharge drainage water to the north or south so as to not direct roof drainage water at the adjacent properties. We also recommend that any downspouts on the garage be discharged to the alley to direct that drainage water off the property instead of across the property. Thank you for selecting CTL�THOMPSON for your engineering needs. When we can be of additional service, please contact the undersigned. Very truly yours, ,� n�� ` `,-�]'` ' L CTL�THOMPSON, IT�IEj' �� � � ��`�;y�c �t � nl� ,,�. �.t „�;- .:J�: .� '`�'• `'.`�� _ r� a� 3 i.; I". f: - �' F.1� 25 .a vS� �o����!,��fi� Cl Wyatt M. Knutsori�Fa.� a �<.�a� -t Division Manager �'f��f����`�y.!;��°°�y`�<��rp'� ����.,. ' _ - Attachment: Drainage Plan� � I 103 Uld 1o�vvn Lane �, S�_iite ��i) IN �_;'ney������.-� �,'�iyn�rii�� �3��Oi1�j , I,�I�;� r���� ����-%��b ���155 �v�nnai c[I't �uu�i �_. — — � ��-zo� GRADING PLAN FOR COM 410 FT N OF SE COR OF BLK 282, WEST SIDE ADDTN 233 NORTH LOOMIS AVENUE NORTH LOOMIS AVENUE FORT COI.LSNS, COLORADO H3 CONSTRUCTION AND DESIGN JULY, 2018 ALLEY