HomeMy WebLinkAboutSHAMROCK MANOR PUD FINAL - 53 89A - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT�J
STORM DRAINAGE REPORT
FOR
SHAMROCK MANOR P.U.D.
A REPLAT OF PART OF PINEWOOD P.U.D.
PREPARED FOR
GREELEY NATIONAL BANK
C/O GEFROH - HATTMAN
STE_WART & ASSOCIATES. INC.
December 4, 1989
DRAINAGE REPORT
SHAMROCK MANOR-P.U.D.
Shamrock Manor is a replat of the west one half of Pinewood P.U.D.
Pinewood P.U.D. is a replat of the original plan of Pinewood Townhome
P.U.D. Pinewood Townhome P.U.D. was designed by Joseph Roesser in 1979,
and the utility lines, curb, and pavement were constructed, per this
plan. This 1979 plan provided storm drainage detention i'n the parking
lots with outflow through area inlets and pipelines, which emptied into
a grass Swale on the east side of Stover Street.
There are two drainage basins in the development. The east one is
fully developed, and the west, which is Shamrock Manor, has all of the
utility lines, curb, and pavement constructed. There are no residences
constructed in the west portion, but there is one 5-car garage existing.
This garage was constructed by the Pinewood P.U.D. plans as designed
in 1984 by Engineering Professionals. The Pinewood P.U.D. replat of
the Pinewood Townhome P.U.D. did not change the grades or locations of
the existing curbs and pavement, but it did propose to deepen the west
detention pond from a depth of 1.1 feet to a depth of 1..7 feet at the
inlet grate. This raised the high water line of the pond from 98.0 to
98.6. The previously mentioned 5-car garage is constructed with a
floor elevation of 97.6 which puts it 0.4 feet below the existing overflow
elevation of 98.0, and will put it 1.0 feet below the proposed elevation
of 98.6. The Engineering Proffessi'onal grading plan shows the floor
to be above the high water line, but this plan apparently was not followed
when the garage was constructed.
The 1984 Pinewood P.U.D. plan called _for restriction plates to be
installed. A restriction of 3V' x 3" is proposed in the existing manhole
on the west side of Stover Street. This manhole controls the outlet
into the Scotch Pines swale lying east of Stover Street. A restriction
of 8" x 32" is proposed out of the existing area inlet in the west
(Shamrock Manor) parking lot. To date, these restrictions have not been
installed.
Attached are plans of the original 1979 Pinewood Townhome P.U.D., the
1984 Pinewood P.U.D., and proposed Shamrock Manor layout.
The detention volume required in the Shamrock Manor pond is 9000 cubic
feet as per the Pinewood Townhome report by Joseph Roesser. The proposed
Shamrock Manor development will not increase the impervious area, or
change the drainage patterns from those of the Pinewood Townhome
development.
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Phillip I. Robinson, P.E. & L.S. 4502
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