HomeMy WebLinkAboutDrainage Reports - 04/02/1992final Approved Report °P y
FINAL
STORM DRAINAGE
AND
EROSION CONTROL REPORT
PARK SOUTH P.U.D. FIRST REPLAT
Prepared
for
MARC MIDDEL
Prepared
by
STEWART & ASSOCIATES. INC.
214 North Howes Street
Fort Collins. Colorado 80521
3l /8/ 1992
FINAL STORM DRAINAGE
AND EROSION CONTROL REPORT
PARK SOUTH P.U.D. FIRST REPLAT
LOCATION AND DESCRIPTION OF SITE
Park South P.U.D. First Replat is located approximately 1200 feet south
of Horsetooth Road on the west side of Manhattan Avenue. The gross area
of the First Replat, including one—half of Manhattan Avenue, is 4.59 acres.
Manhattan Avenue is existing pavement with drain swales along the sides,
and runoff in these swales empties into the existing drainage channel running
from west to east along the south boundary of Park South P.U.D. Park South
P.U.D. First Replat is located in the southeast corner of Park South P.U.D.
The gross area of Park South P.U.D. to the center of Horsetooth Road and
Manhattan Avenue is 31.30 acres. A map of the total Park South P.U.D. areais
included in this report. There is an existing 36—inch storm drain along
the west side of Manhattan Avenue running from Horsetooth Road to the existing
drainage swale.
HISTORIC DRAINAGE
The total Park South P.U.D. site drains to the existing Park South —South
Glen detention pond constructed in the early 1980's. This pond is located
on the east side of Manhattan Avenue, just across from the Southeast corner
of the Park South First Replat. The existing drainage channel across the
southerly 3q—Leet—Qf the Park South area drains to this pond. The pond has
a volume of J11.6 acre: feet and was originally designed with a volume adequate
to provide a en ion or e total Park South P.U.D. This volume design
was based on all residential development in the Park South P.U.D. Now there
is a business area proposed on the north 13.8 acres of the site. The business
area will require some onsite detention to compensate for the additional
run—off generated, but until the time of development, it will remain a field.
PROPOSED DRAINAGE DESIGN
Lots 1 through 18, Stream Court, and the south portion of Dennison Avenue
will drain south on Stream Court, then through a sidewalk culvert into the
existing drainage channel. Lots 19 through 23 and the north portion of
Dennison Avenue will drain to a catch basin located on the north flow line
of Dennison Avenue just west of Manhattan Avenue. Dennison Avenue is
presently rough graded west of the First Replat to a tie—in with the existing
paved Dennison Avenue in the Four Seasons area. This rough —graded channel
will carry any 100—year overflow from the Four Seasons area through the First
Replat. As the Second Replat is developed, Dennison Avenue will be rerouted,
and the overflows will be directed to the drainage channel across the south
30 feet of the Park South area before they reach the First Replat.
When Lots 11 through 23 are graded so that flow is from the rear lot
line to the front, the grade at the rear of the lots will be raised above
I
he existing ground from 1 to 2 feet. In the future, when lots are developed
west of Lots 11 through 18 and north of Lots 19 through 23, the rear yards
of the future lots will also be raised to drain east and south to the front
Park South P.U.D. First Replat
Page 2
of Lots 11 through 23. Prior to future development, runoff from the field
west of Lots 11 through 18 will be blocked by the raised rear yards and will
then flow south, on an approximate 0.5 percent existing slope, to the existing
drainage Swale along the southerly 30 feet of the Park South area. Also
R� prior to.future development, any runoff from the field to the north which
is blocked by the raised rear yards of Lots 19 through 23 will be turned
to the east and will flow to Manhattan Avenue on an approximate 1.0 percent
existing slope. The flow area west of Lots 11 through 18 is denoted as Basin
C.
There are two drainage plans attached. One shows the drainage patterns
of Park South First Replat and the surrounding undeveloped land. The other
shows conceptual drainage patterns for the total developed Park South area.
Drainage sub —basins are shown on these plans, and the attached computation
sheets determine the storm water runoff from Basins A, B, C, 1, 2 and 6.
The runoff from 6 is used to size the catch basin inlet on the north side
of Dennison. Also attached is the grading — drainage — erosion control plan
for Park South P.U.D. First Replat. The design and calculations in.this
report are in compliance with current City of Fort Collins criteria and master
drainage plan.
EROSION CONTROL
Straw bale sediment filters shall be placed around the catch basin on
Dennison Avenue and the sidewalk culvert on Stream Court prior to paving,
and gravel sediment filters shall reolace the straw bales after the streets
are paved and before yard grasses are establishe traw mulch and seeding
shall be used to prevent erosion on a portion of the newly disturbed areas.
The rainfall performance standard evaluation and the erosion control
effectiveness calculations are shown on the attached sheets.
This site is located within a low wind erodability zone, so the instal—
lation of curbs and pavement and storm water erosion control procedures will
meet the wind erosion control requirements. All erosion control procedures
shall comply with the Erosion Control Reference Manual for Construction Sites
of the City of Fort Collins.
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RAINFALL PERFORMANCE STANDARD EVALUATION
I------------------------------------------------ ------------------
PROJECT: Park .5ou4A PuP First RerloL STANDARD FORM A
ICOMPLETED BY: Pf7if R -_DATE: 6 z
-----------=---------------------------------------------- -- --- --
IDEVELOPEDIEROOIBILITY Asb Lsb I Ssb I Lb I Sb I PS
ISUBBASIN ZONE (ac) (f I (")� (fee I (b) I (%)
- - - - - ---
----- -------- -- ----- I -
-T-o-7-,a- --- � M e14 erc,4e 3 .`l 1' 500 0. aX I I
SITE„ III II ! I
I I i i 500 0, 6� i 73,7�
I------------------- ---------------------------------==---------------j
HDI/SF-A:1989
JA,2I ARY 1991 8-I8 DESIGN CRITERIA.
EFFECTIVENESS CALCULATIONS
I----------------------------------------------------------------------
PROJECT: -Park Sovi'h PUP Firsf KCF"- STANDARD FORM B
COMPLETED BY:/Jz DATE: �. z
Erosion Control
C-Factor
P-Factor
Method
Value
Value Comment
Bare soi----------
----------------
1.00
--------------------
00
/rlj'e ' Fif ierS
I, 0 0.
0.00
mvktiel seccl n5
0.06
1,00
F,vr-f and cons
0.01
exist- Jcr-ounJ covet'. 0.0¢ 1.00 707 ir, soAi sa/aIe
Site" -Fence /.UU 0.60
------------------------------------------------ — ------
MAJORI PS I SUB AREA
BASINI (;) BASINI (Ac) 1-M
CALCULATIONS
hiTAL'--------I-------------
517f_
73 ,7
W
pvrn�. area _ 0.83 Ac, ----------------
MUIche) se��ti� _ //30.x75 = I -9 fl c,Crear o� Iris
exi4..sgA svjclel. jro,,,. cover - o.zo Ac.
bare yrov'%`I ; 0.1$ Ac.
1�/1d C D•83X.o1 + 1,.qA.06+0.2>c.o4+0.98xi�
L. 110s _ 0,28
�cnce
X.
EFF =�/ — O.LB¢X. �)x IOU
G
O
---------------
DI/SF-B:1989
TAMT-1W7 1ail 8-19 n.sTcv r?T7-7� -_
CONSTRUCTION SEQUENCE
PROJECT: F/79,9K .SOL/ TM EIRST 77EPL.AT STANDARD FORM C
SEQUENCE. FOR 19 9Z ONLY COMPLETED BY: F✓ IT, DATE:
Indicate by use of a bar line or symbols when erosion control measures will be installed.
Major modifications to an approved schedule may require submitting a new schedule for
approval by the City Engineer.
YEAR
MONTH F I M
------------- ---- -----
OVERLOT GRADING
WIND EROSION CONTROL
Soil Roughing_...
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other
RAINFALL EROSION CONTROL
STRUCTURAL:
Sediment Trap/Basin-
Inlet Filters
Straw Barriers
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
Contour Furrows
Terracing
Asphalt/Concrete Paving
Other
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
Other
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STRUCTURES: INSTALLED BY MAINTAINED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
HOI/SF-C:1989
APPROVED BY CITY OF FORT COLLINS ON
✓I I
-------------
7 GG
iiri needs;
JAN A_?Y 1991 8-20 DESIGN CRITERIA
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PARK 5 0 uTN PVD - FIRST REPL I
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i 214 N. HOWE3 STREET: FORT COLLINS, CO. 90321 I3071 4e2-9331
°•"' REVISIONS
ORA/NA GE' PLAN ° 1. .r . °....: ° .. ,
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" CONCEPTUAL PLAN` OP DRAINAGE
.TOTAL DEVELOPED,,,,..SITE Pin .. .,
LT �, •� ..,, �T APPROVEd FOR CONSTRUCTION I . •,• ..