HomeMy WebLinkAboutGrading Plans - 03/26/2021� CTL I THOMPSON
March 22, 2021
Old Town Designs, Inc.
210 E. Oak Street
SUlte C
Fort Collins, Colorado 80524
Attn: Ms. Keira Harkin
Subject: Drainage Memo
511 North Grant Street
Fort Collins, Colorado
Project No. WY01880.000-500
Dear Ms. Harkin,
Grading/Stormwater Plan Accepted
(Building Permit Released)
Accepted by: Dan Mogen
Date: 03/26/2021
The above referenced lot has historically drained as an "B" lot with a high point approximately 110'-
0" from the east property line. The drainage flowed from this high point to the east towards North
Grant Street and to the west to the alley. This lot has slopes that ranged from 0.2% to 2.0%.
The original lot consisted of the original house with an approximate square footage of 561 sf, an
original detached garage with an approximate square footage of 320 sf, an original detached
storage shed (to be demolished) with an approximate square footage of 110 sf and 100 square feet
of sidewalk for a total building area of approximately 1091 sf. The total lot area is approximately
5600 square feet. The proposed impervious area will include 1050 square feet of house, 320 square
feet of existing garage and 100 square feet of sidewalk for a total of 1470 square feet. This
increases the impervious surFace area by 379 sf or 7%.
Attached is a drainage plan that includes drainage around the proposed new structure. This
drainage plan will conduct water away from the proposed and existing structures and direct the
drainage water in the same direction as it has historically flowed. 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 and south side swales will drain across the turF and landscaping towards the
east to North Grant Street. We recommend that the new downspouts on the residence be installed
to discharge drainage water to the north or east so as to not direct roof drainage water at the
adjacent properties. The drainage recommendation for this lot will not have any adverse impacts on
the adjacent lots.
Thank you for selecting CTL�THOMPSON for your engineering needs. When we can be of
additional service, please contact the undersigned.
Very truly yours, .,:-.,-.--.:._..-�,.:
CTL�THOMPSON INC �:�"����'�'t� �-1�; :`�.
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1103 Old Town �ane � Suite 201 E � Cheyenne, VVyoming 82009 � Telephone: 970-206-9455 � www.ctlt.com
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