HomeMy WebLinkAboutDrainage Reports - 02/23/2017y INT¢RW¢8T C O N S U L T I N G G R O U P
February 10, 2017
City of Ft. Collins Approved Plans
Mr. Wes Lamarque Approved By
City of Fort Collins Stormwater Date Q- — 7
700 Wood Street
Fort Collins, CO 80522-0580
RE: Final Drainage Report for Harmony Commons Subdivision
Minor Amendment Memo #1
Dear Wes,
A Minor Amendment was submitted for Harmony Commons in January, 2017. A part of
this amendment to the Site Plan was the addition of four (4) small patios on Lots 3 and 4.
Your review comments request a memo discussing the impervious area added by these
patios. Lots 3 and 4 are a part of Basin G in the approved drainage report for the overall
subdivision. Much of the proposed patio area is proposed under roof overhangs, so there
is no increase in imperviousness in these areas. The total area of new pavement where
there was pervious area is 2,200 SF. Basin G is 51,412 SF, so this 2,200 SF is a 4%
increase to the imperviousness of this sub -basin.
It is more appropriate to look at the overall project site in this PDP/FCP (Lots 3, 4, and
5). These lots are basins A through H and 5.73 acres. When looking at these patios
compared to the overall project area, the 2,200 SF increases the impervious percentage
0.9%, which is negligible.
The original approved drainage design for Harmony Commons is not impacted by this
small impervious addition.
I appreciate your time and consideration in reviewing this submittal. Please call if you
have any questions.
Sincerely,
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Michael Oberlander, P.E., LEED AP
Colorado Professional
Engineer No. 34288
1218 W. ASH, STE. A, WINDSOR, COLORADO 80550
TEL. 970.464.8488
INTGRWISST CONSULTING -GROUP
February 10, 2017
Mr. Wes Lamarque City Oft Collins ppr d Plans
City of Fort Collins Stormwater Approved By
700 Wood Street {jam@ .• — 6
Fort Collins, CO 80522-0580
RE: Final Drainage Report for Harmony Commons Subdivision
Minor Amendment Memo #1
Dear Wes,
A Minor Amendment was submitted for Harmony Commons in January, 2017. A part of
this amendment to the Site Plan was the addition of four (4) small patios on Lots 3 and 4.
Your review comments request a memo discussing the impervious area added by these
patios. Lots 3 and 4 are a part of Basin G in the approved drainage report for the overall
subdivision. Much of the proposed patio area is proposed under roof overhangs, so there
is no increase in imperviousness in these areas. The total area of new pavement where
there was pervious area is 2,200 SF. Basin G is 51,412 SF, so this 2,200 SF is a 4%
increase to the imperviousness of this sub -basin.
It is more appropriate to look at the overall project site in this PDP/FCP (Lots 3, 4, and
5). These lots are basins A through H and 5.73 acres. When looking at these patios
compared to the overall project area, the 2,200 SF increases the impervious percentage
0.9%, which is negligible.
The original approved drainage design for Harmony Commons is not impacted by this
small impervious addition.
I appreciate your time and consideration in reviewing this submittal. Please call if you
have any questions.
Sincerely,
Michael Oberlander, P.E., LEED AP
Colorado Professional
Engineer No. 34288
1218 W. ASH, STE. A, WINDSOR, COLORADO 80550
TEL. 970.464.8488