HomeMy WebLinkAboutDrainage Reports - 04/04/1990I
FINAL DRAINAGE REPORT
FOR
GATEWAY TO HARMONY ROAD P..0 D THIRD FILING
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PREPARED BY
STEWART & ASSOCIATES. INC.
FEBRUARY 1990
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FINAL DRAINAGE REPORT
GATEWAY TO HARMONY ROAD P.U.D. THIRD FILING
SITE LOCATION: The site is located at the northwest corner of the
intersection of South College Avenue and West Harmony Road. The property
is north of the existing McDonalds Restaurant.
EXISTING CONDITIONS: The site is 0.92 acr s. The existing site slopes oFf 3i�7
west to east about 1.8%. There is no vec7 ation on the site. There �
are three large cottonwood trees in the northeast corner of the site. �� / fJ ,
DESIGN: This Third Filing is part of the original drainage report for ��
the Gateway To Harmony Road P.U.D., completed May 1, 1989, by Stewart
and Associates, Inc. This Third Filing redesigns sub —basins 'B' and
'C' as shown on the original plan into sub —basins "B"," C", and "H".
The remainder of the sub —basins did not change, therefore no revisions
are required on them.
The original sub —basins 'B' 'C' had an area of 0.92 acres, a combined G,
detention pond capacity of 90 cubic feet; and a total release rate
of 0.47 c.f.s.
The total area of the TF�'rd Fili g is the same as the area of the original
sub —basins 'B' and 'C; he requi d volume and release rate will be the
same. The required volume is 9 cubic feet. The required total release
rate is 0.47 c.f.s. /
Required detention for pond "B" is 4082 cubic feet; for pond "C" is 1418 /
cubic feet; and for pond "H" is 1418 cubic feet. The designed detention
for pond B is 4395 cubic feet; for pond "C" is 1283 cubic feet, and for
pond "H" is 1418 cubic feet. Ponds "B" and "H" exceed or equal the
required detention. Pond "C" is 135 cubic feet short of the required
detention but the overflow will be to Pond "B" which can handle it.
The release rate for pond "B" is 0.27 c.f.s., for pond "C" is 0.10 c.f.s.,
and for pond "H" is 0.10 c.f.s. Each pond will have a restriction plate
placed over the outlet pipe to control the rate of release.
A copy of the original report along with the new calculations are included
with this report.
Franklin D. Blake, P.E. & L.S.
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