HomeMy WebLinkAboutINDIAN HILLS VILLAGE FINAL PUD - 81 93A - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORTSTEWART&ASSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: PI Date: 3 3/ Client: L a s u rAol Co Sheet No. 3 of
Project: r„d I o n L/i J I G
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STEWART& SSOCIATES 103 PH. S. MELgg DRUM, FFAX4O TT 82-9382 COLLINS, CO 80521
Consulting Engineers and Surveyors
By: I Date: 3 31 Client: Lam cl n /,taS 60 Sheet No. Z of
Project: 1/-7cl i ah 14ilJs (/illa6 if
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STEWART&ASSOCIATES 103 S. MEL9331 DRUM, FORT COLLINS, CO 80521
PH. 482-FAX 482-9382
Consulting Engineers and Surveyors
ly: Date: 3 3) IF- Client: Lq5utiflot'f <f 0 Sheet No. of
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Indian Hills West P.U.D.
The curb inlets on Indian Hills Circle and the area inlet in Tract B are
sized to handle the 10—year storm. The outflow pipes from these inlets are
sized to carry the 10—year flow to Spring Creek. The pipe under Stuart Street
will be extended into the newly constructed Spring Creek drainageway, and care
will be taken by the contractor to replace any of the existing drainage
structure which must be removed to accommodate the Indian Hills Village runoff.
EROSION CONTROL
The site is located in a high to moderate rainfall erodibility zone and
in a moderate wind erodibility zone. Erosion will be controlled by the
installation of curbs and pavement and by maintaining the natural vegetation,
especially in the eastern half of the project where utility lines are existing.
Sediment will be controlled by the installation of inlet filters, straw bale
channel barriers and a silt fence along the north boundary.
Wind erosion control will be provided by the installation of curbs and
pavement, and by the existing tree rows along the east and west property lines.
INDIAN HILLS VILLAGE P.U.D.
FINAL STORM DRAINAGE AND EROSION CONTROL REPORT
SITE LOCATION AND DESCRIPTION
Indian Hills Village is located on the south side of East Stuart Street,
approximately a mile east of College Avenue. It is in the Southeast a of the
Northeast a of Section 24, Township 7 North, Range 69 West of the Sixth P.M.,
Larimer County, Colorado. The net area of the site is 6.215 acres; and the
gross area, including the south half of Stuart Street and the existing single—
family residence at the northeast corner of -the site, is 6.72 acres. The site
is located in the Spring Creek Basin. Spring Creek crosses Stuart Street about
100 feet west of the site and then runs east along the north side of Stuart
Street across from the site.
The site is bounded on the east by the Indian Hills single—family
subdivision, on the south by the Indian Hills West townhouse subdivision, and
on the west.by the Parkside single—family subdivision. All of these
developments have been established for many years.
Indian Hills Village is a replat of the north portion of the Indian Hills
West Subdivision which was platted and the south portion developed in the late
1970's and early 1980's. During this development period, some utility line
installation and some overlot grading was done on the site, but since that
time, there has been no activity on the site, so weeds and native grasses have
grown. There is a dense row of trees along the east and west sides of the
site. These trees are in the rear yards of the adjoining subdivision.
The site drains from south to north at approximately 1.7 percent slope.
The drainage is directly into the south gutter of Stuart Street.
OFFSITE FLOWS
There are existing drain swales running from south to north along the
east and west boundaries of the site. These swales pick up offsite flow from
the rear yards of Indian Hills Subdivision lots on the east and from rear yards
of the Parkside Subdivision on the west. Lost of the developed portion of
Indian Hills West townhouse area lying south of the site drains north to Stuart
Street through the swale along the west boundary, but 0.7 acres of the developed
townhouse site drain through the proposed new streets.
PROPOSED DEVELOPMENT
The 6.215 acre site will be developed into 47 single—family lots with
associated streets and open areas. Offsite runoff through the developed site,
as previously discussed, will be carried through the site by swales along each
side and by the street system. Runoff from the site will also be overland
to the sideline swales, but most of the runoff will be northerly through the
street system to catch basins on Indian Hills Circle just south of Stuart
Street. The drain swale along the east property line drains north into the
south gutter of Stuart Street, then west in this gutter a few feet to an
existing 4—foot curb inlet. The drain swale along the west property line drains
north to the northwest corner of the site then east to an area inlet. A
concrete drain pan will be constructed in the swales along the east and west
property lines.
Indian Hills Village P.U.D.
Page 2
The following pages of report, calculations, and maps and the included
drainage plan give a more detailed analysis of the proposed storm drainage
system.
The storm drainage and erosion control design complies with City of Fort
Collins criteria.
Si ncerely, `���������•
Q
Phillip I. Robinson,. P.E. & L.S.
Vice President0. = 4502
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'•. '•: E. & �:� O ••
enclosures ,,
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STEWART&ASSOCIATES
Consulting Engineers and Surveyors .
March 31, 1994
Mr. Glen Schlueter
Storm Water Utility
City of Fort Collins
P.O. Box 580
Fort Collins, Colorado 80522
Dear Glen:
The following drainage and erosion control report was prepared for Indian
Hills Village, which is a Planned Unit Development of detached single—family
residences.
The site is located in the Spring.Creek Basin. The Spring Creek
drainageway through this vicinity has been constructed to carry the 100—year
flows.
We plan to allow runoff from this site directly into Spring Creek with
no onsite detention.
Indian Hills Village is an infill subdivision, and all surrounding areas
were developed several years ago. All of these surrounding areas drain directly
to Spring Creek undetained.
There will be offsite flows onto the site from 1.8 acres of rear yards
on the east and 1.4 acres of rear yards on the west, and also from a 5.76 acre
townhouse development to the south. Most of these offsite flows will be carried
to Stuart Street by existing swales along the east and west sides of the site.
Offsite flow from a small portion of the townhouse development to the south
(0.7 Ac) will be carried through the streets'of•the proposed development.
- The construction of the proposed Indian Hills Village development will
not substantially change the route of storm water as it flows to Spring Creek,
except that the proposed new inlets located south of Stuart Street and the
proposed storm drain pipe under Stuart Street will decrease the flow reaching
the south gutter of Stuart Street. Storm flows will be picked up on the south
side of Stuart Street and will be piped under Stuart Street directly into Spring
Creek.
James H. Stewart
and Associates, Inc.
103 S. Meldrum Street
P.O. Box 429
Ft. Collins, CO 80522
303/482-9331
Fax 303/482-9382
FINAL STORM DRAINAGE AND EROSION CONTROL REPORT
FOR
INDIAN HILLS VILLAGE P.U.D.
PREPARED
FOR
LAGUNITAS COMPANY
MARCH 1994
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
FORT COLLINS,. COLORADO 80521
303/482-9331
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5-10
DESIGN CRITERIA
STE V VART&ASSOCIATES- 103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
Consulting Engineers and Surveyors
By: Date: Cli( Sheet No. —of
1
Project:
Subject:
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GENERAL NOTES:
1. AREA INLETS MAY BE USED FOR
DRAINAGEWAYS OTHER THAN STREETS.
(EXAMPLE, PARKING LOTS,
MEDIANS, SUMP BASINS),
AREA INLET
CITY OF FORT COLLINS, COLORADO I
ENGINEERING SERVICES UNIT
APPROVED BY:
DATE: jz6ZS04
REVISIONS: 0 PIR 7/1G193 D
(1) Lar9Er site fo/ 24.'l Plpe
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STEWART&, tSSOCIATES 103 S. 82-933 RUM,FAX FORT gOLLINS, CO 80521
PH.Consulting Engineers and Surveyors /I
By: PI %� Dater 3 3.1 Client: La a o n � 7�a.S C0 Sheet No. _ of _
Project: Indie, IMIs Villcr
Subject: t'Oon
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CONSTRUCTION SEQUENCE
PROJECT: 10 -di a h N-illl Lh 11 6 r STANDARD FORM C
SEQUENCE. FOR 19 '(4— ONLY COMPLETED BY: DATE: _3 3)
Indicate by use of a bar .Iine or symbols when erosion control measures will be insta11e1.
Major modifications to an approved schedule may require submitting a new schedule for
approval by the City Engineer.
YEAR
MONTH
------------------
OVERLOT GRADING I
WIND EROSION CONTROL
Soil Roughing
Perimeter Barrier s4!Ar
Additional.Barriers
Vegetative Methods
Soil Sealant
Other cvr-
RAINFALL EROSION.CONTROL
STRUCTURAL:
Sediment Trap/Basin
Inlet Filters
Straw Barriers
Silt Fence Barriers
Sand Baas
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 ex'sl- gel
STRUCTURES: INSTALLED BY
01
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED
HDI/SF-C:1989
I'V111IM11ILu V I
APPROVED BY CITY OF FORT COLLINS Off
JANUAaY 1991 8-20 DESIGN CRIT7.'.1;,.
EFFECTIVENESS CALCULATIONS
- ---------------------rr
PROJECT: �/x�la µ�t�s Vl 0 STANDARD FORM B
COMPLETED BY.. DATE: 3 3i
MAJORI
BASINI
Erosion Control C-Factor P-Factor
Method Value Value Comment
----------------------------------------------------------
PS__iM
,;�Wj
7fi - i
-------------
SUB AREA
BASIN+ (Ac)
D_ 10.BO
F
F
1,34.
CALCULATIONS
--------------------
------------------
C7,s5 AL bore s0i �
Q.ZS Ac cVr� r i'✓r-
ww G= o.>s)C i_v-(0.25)(0_01)— Q.G9
--- -
W 7-j F, silk �e f%c t 0.��7 = 0. 4-
q a ✓el i�l4 F'l-V-(Jp
(0.0?xo.!)Y,vu = 7Z_4-70
0.72- AG ar-e Sdi
tJ.Z7 +C- curl � �•r•
0-35- A
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i 34
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0.
EFF c / — (o-5srx 0.q.) xi00 = 75l0
0,10 U.Ui Ac borC soil
il•OiAc cvr5 `� �✓Mi-
tAl C - O, 0 !, 1. 0 o.OS)�0.01
I _ SiiY O r tcrct S _
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S• Y Z
EFL = 80.-3
---------------------
HDI/SF-B:1989
EFFECTIVENESS CALCULATIONS
+PROJECT: lad cin 144-f V;il SP STANDARD FORM B
(COMPLETED BY: DATE: 3 31
I Erosion Control: C-Factor P-Factor
I
Method -Value-------Value--------Comment
---------------------------
I i3o re So i t 1. a 1.0
cvrS & TJrM U. o l 1.0
gNovcl - Aer /. 0 .0.8
}ra✓ bale, l.0 0.0
s 0 - �ence /. 0 0,S
ex;sve5 o, 04- I. o
----------------------------------------------------------------------
MAJORI PS SUB AREA
BASIN (%) BASIN (Ac) CALCULATIONS
--- ---- --- --------------------- --------------------
7c�-.q A 0,67 O.ZS AL bare soil
o• 14- Ac_ ct/4 pvr+i
0.1k A c e ), i/e5
a.14-)eo,oi t 11126) -0- = 0.31
0,67
S}ram✓ bale barrCrt U,e
F_FF = I— (03� )c 0.4) x 100 4
6 Q. 9j 0.16 .4L bore Soi 1
6.34 ,4c cvrS -4-
0, 4-,�- Ac exi 5{ Ve5
S 14 �e-ce 0.
9rcvel Ti4e-r 0.6
OFF= 1-�d:IgxU•4�xi00= 9Z,4-7
G Z.06 I. 1 1 Ac bore f0)
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RAINFALL
PERFORMANCE STANDARD EVALUATION
------------------------------------
PROJECT:
117d)Otn P1115
1/1110Se
--------------------------------
STANDARD FORM A
COMPLETED
BY:
DATE: _3 31 Q
-----------------------------------------------------------
DEVELOPED
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PS
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-----
410
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STEWART$,A SSOCIATES 103 S. PH 482-93 1 Ff X 482 9 $OLLINS, CO 80521
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PH. 482-FAX 482-9382
Consulting Engineers and Surveyors
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