HomeMy WebLinkAboutWESTBURY PUD, SECOND FILING - FINAL - 11-94B - SUBMITTAL DOCUMENTS - ROUND 1 - DRAINAGE REPORT103 S.
$TEWART$,ASSOCIATE$ PH 82-9 3D1RF X 482-9382,UM, FORT 0LLINS, CO 80521
Consulting Engineers and Surveyors
3y: i %,� Date: 3 Zo 'i Client: /�Q t /-i n d e. r' Sheet No. of
Project: W/eS-�bury - P VD -S c.and
Subject: FrOSiOh Cohlrol L/—,oa er4
�3ovE 1 i`bITCH T.T.
_.�Lo�} o� f --. d, lCti .._....Lei 'r\._I
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le. �barriersl is `-°--� 1-- -- - —'— -- -
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CONSTRUCTION SEQUENCE
PROJECT:
V✓ES1 t3y2Y
YV D 2
STANDARD FORM C
SEQUENCE.
FOR 19 qS
ONLY COMPLETED BY:
DATE: 3 w 9 5
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 15
I
MONTH
1- I s 1,4 15
1 0 1 Al p
I
----------------------------
OVERLOT
GRADING
T-------------------7
T
1
'I
I
--------T
I
---j
I
---T
I
---j
I
--
---�
WIND EROSION'CONTROL
Soil Roughing
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other curb s
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 Gvrbs
VEGETATIVE:
Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
Sod Installation
Nettings/Mats/Blankets
Other
---------------------------------T-
STRUCTURES: INSTALLED BY MAINTAINED BY
VEGETATION/MULCHING CONTRACTOR
DATE SUBMITTED APPROVED BY CITY OF FORT COLLINS ON
HDI/SF-C:1989
JANUA -1 199 L 8-20 DESIGN CRITER-TA
EFFECTIVENESS CALCULATIONS
---------------------------
------------------------------------
PROJECT: %A/EST3(/IZ)/ PVP SEGUwD F)LINc— STANDARD FORM B
/�RE/i H[30VE 017CH
COMPLETED BY: DATE: 3 20 '�5
MAJOR!
BASIN
ARE/a
gBOVE
7rCH
Erosion Control C-Factor
Method
Value
Bare Spi
seed <�C- iudl c4
( Ic v+- 0 �o + ;e i l+c�ra P>
UO
0., 0 r
1.00
.5+r-aw bclrrlerS
1.0 0
rvMt cvrbS
0.01
PS
M
80. G
P-Factor
Value Comment
I v r --------------------
r_oG'
U. �B
(100
---------------------------------------------------------
SUB AREA
BASIN (Ac) CALCULATIONS
---- ------
5.92 pv,�4- Gvr bs U, 75 Ac
se e vl 61, Z. 3 0 oc
bore so i % 2, G7 A--
G _ �0.95)60.01)4- (2.30)(0.06) 4+ 67)6
s,9Z
c : o, 4-e
r-- 0.S,x 0.S- = 0,4
Seed G, � M vl ��, re -or
c70 U�- all lugs
s
l
I------------------------------------------------ ----------------------
HDI/SF-B:1989
EFFECTIVENESS CALCULATIONS
--------------------------------- ----- ----------------------------
PROJECT: `.JES rlsuRY Pt/D SEGOND FILWC- STANDARD FORM B
ARE.+ aeLvvI 171Tc4
COMPLETED BY:
DATE:
Erosion Control
C-Factor
P-Factor
Method
Value
Value Comment
-----------------------
B are Svl ------
i
4-Mvl, h
--
/.06
---o ----------------------
/-00
.5ecj-
pond.
0.06
/.00
1 0
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s }roll ✓ b a rn e rf
inlet f-IIIerS
1. 0 v
v. £l0
1.00
�vr�f cvl�I
0.61
I.00
MAJORI PS SUB AREA
-----------
-----------
BASIN
(%)
BASIN
(Ac)
CALCULATIONS
-----
4REA
------
-----
------
---------------
cvrhi Zoo AC
aet,ow
7y.8
IU,SG
see24-L'I�/' .3.Z0 Ar-
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bare so i
S, 0 6
10,56
G =, s0'
�= c).a-x0.i = a.4
Fr- X.-50) jX100
EFr
Sect Avl CA
CArN re- or- �Grdl
Z-45 Z ( 3 J
ork? SS- 5-7
e
---------------------- ------------------------------------------------i
)I/SF-B:1989
'•
RAINFALL
PERFORMANCE STANDARD
EVALUATION
---------------------------------------------------------------------
PROJECT:
1n/E 57(3 u )zY
P(/D SCGO,vb FILING-
STANDARD FORM A
COMPLETED
BY:
DATE: 20 qS
---------------------------------------------------------------------
DEVELOPED
ERODIOI.LITY
Asb
Lsb
Ssb
Lb
Sb
PS
SUBBASIN
ZONE
(ac)
(ft)•
(%)_
(feet)
M
( )
-------
13/a51 �✓
---------
N h
-----
5.9Z
------
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5�0
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Z
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nV f Cc
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77.6
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---------------------
iu�t i�c_.r•inan
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COMPUTATIONS _
Stewart & Associates, Inc. 103 5. MELDRUM Sf. Ft. Collins, CO 80521
C' P_ 3 Date
`Chkd By: Date
(303) 482-9331
Client: Sheet No. of
Project:
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COMPUTATIONS
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zy: F'1 R Date - Client: Sheet No. of
Chkd By: Date Project:
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STEWART&ASSOCIATES 10 82 9 3DIRUM,FAX FORT COLLINS, CO 80521
PH.82
Consulting Engineers and Surveyors
By: P 19 Date: Client: inia lK L i ^ Ir Sheet No. _
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Consulting Engineers and Surveyors
By: p J 1� Date: s 2 d 4 S" Client: o rK L i n �� /' Sheet No. _ of
Project: V e-s iD U r (% D
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Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: p ) I� Date: 3 2r/ Client: M a roc L f hG�e r Sheet No. —of
Project:
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PH.Consulting Engineers and Surveyors �1 /
By: P) Date: 3 2 `1 S� Client: AA a ✓ �c L Sheet No. —of
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Subject: C O h c P n -Lra ` (7 n >o k,4S
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PH.Consulting Engineers and Surveyors I
By: F� 1, / Date: 3 2. v � Client: /�� ��C L I n de ►� Sheet No. of
Project: W e S� b V r y ? V p 2 h--�
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Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
Project: `,, e
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PH.Consulting Engineers and Surveyors .
By: [7 I''%� // r � Date: 3 20 S� Client: /ylo. rk Li � � e w Sheet No. _ of
Project: �/ e 5 D V f 2 n�
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PH. FAX 482-9382
Consulting Engineers and Surveyors
By: P l E Date: Client: Sheet No. —of
Project: \-xJe-J U,
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PH. 2
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STEWART&O SSOCIATES 103 . MEL 1RF , FORT gOLLINS, CO 80521
PH.Consulting Engineers and Surveyors
By: P 1 R Date: 3 2 U 9 Client: 114o r tC L! eld C l— Sheet No. of _
Project: W/ fJJ_b (J V V Zf
Subject: Gt S l n C l C L/
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PH.Consulting Engineers and Surveyors
By: .P 1 TZ 1 Date: 3 Z° 9 s Client: M oa ik L ! , �e � Sheet No. _
Project: w/ es4 y r p U 2
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PH.Consulting Engineers and Surveyors
By: p L Date: 3 Lf/ 4 Client: /OGt ri< b h Je r Sheet No. _ of _
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Consulting Engineers and Surveyors
By: Pf /E LL Date: Client: MC' rk L?n j er Sheet No. —of _
Project: �✓ �U U I- V D 2 n
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STEWART&ASSOCIATES
Consulting Engineers and Surveyors
103 S. MELDRUM, FORT COLLINS, CO 80521
PH. 482-9331 FAX 482-9382
By: Pl R< Date: 3 2v 9 i
Project: W es4-� u ry P UL
Client: /V(o rt-c t f'n c1 e ! Sheet No. of
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Westbury Second Filing
Page 2
Runoff from the basins and critical point flows are shown on the calculation sheets in this report.
EROSION:
The Westbury development is located in a high rainfall erodibility zone and in a moderate
wind erodibility zone.
The Second Filing consists of 5.92 acres above the PV & LC ditch and 10.56 acres below
the ditch. The area below the ditch will drain to the detention pond where a sediment trap shall be
installed. Grading will take place on the area above the ditch before the bridge and curbs are
constructed to carry flows across the ditch; so a temporary flow cutoff ditch and berm will be
placed along the west side of the PV & LC ditch to intercept flows and sediment.
The detention pond area and disturbed portions of rear yards will be seeded and mulched.
Straw bales will be placed along the swale on the north side of Lots 1 through 14 and along the
swales through the detention pond. Gravel inlet filters will be placed around all catch basins and
sidewalk culverts.
The 200 foot barrier spacing for wind erosion control will be provided by the curbs and
rainfall erosion control procedures. All erosion control measures shall comply with City of Fort
Collins Criteria.
WESTBURY SECOND FILING
SITE LOCATION AND INFORMATION
Westbury Second Filing is a 16.48 acre tract located in the Northeast 1/4 of Section 3,
Township 6 North, Range 69 West of the Sixth P.M., City of Fort Collins, County of Larimer,
State of Colorado. The site is about 600 feet south of Harmony Road and borders the west side
of Shields Street. Westbury First Filing lies between the site and Harmony Road.
OFFSITE FLOWS:
The total runoff from Westbury First Filing enters the Second Filing along Westbury Drive
and also a small amount enters from the drainage easement at the east side of the First Filing.
This runoff from the First Filing includes runoff generated by the First Filing and also
runoff from the 3.1 acre tract lying immediately west of the First Filing and also runoff from The
Ridge development and Harmony Road to the west of the Pleasant Valley and Lake Canal ditch.
Calculations of these offsite flows are shown on the calculation sheets in this report. The 100
year offsite flow form the 3.1 acre tract plus The Ridge is calculated to be 47.5 c.f.s.. This flow
shall be routed between Lots 2 and 3 of the First Filing to Westbury Drive, where it will flow
south to the Second Filing.
SECOND FILING DRAINAGE:
Runoff from the First Filing shall be routed through the Second Filing to a detention pond
to be constructed along the west side of Shields Street. This detention pond is sized to detain for
both Westbury First and Second Filings, with a release equal to the 2 year historic runoff from the
total site area of 24.5 acres.
Calculations of the release rate and required pond volume are included in the calculation
sheets. Release from the pond will be through a restricted outlet into the existing 15 inch CMP
under Shields Street. Offsite flows from the Ridge and other areas to the west will overflow the
pond and Shields Street and then be carried to the east across the Larimer Community College in
an existing swale which was constructed for the Westbury outflow. This swale is in a 20 foot
easement and will carry 50.6 c.f.s. before overtopping.
SECOND FILING DESIGN:
Runoff generated by the Second Filing will be carried by the streets and storm drain piping
to the detention pond, except for the rear yards of Lots 40, 41, 42, 43, 47, 48, 49, 50, 51, 52, 53
and 54, which will drain directly into the PV & LC ditch. Also, runoff from the pavement via
Shields Street and the Shields and Westbury intersection cannot enter the detention pond since the
high water line of the pond is approximately 1.5 feet above the curb flow line at this intersection.
The Second Filing is divided into 13 basins, and the runoff from each of these basins, as
well as the combined flows at critical points, are shown on the plan included with this report.
No Text
Westbury P. U. D.
Page 4
Erosion will be controlled in the swales by placing straw bale barriers,
and a sediment trap will be placed over the detention pond outlet. Also, the
paved streets shall be cleaned and straw bale barriers shall be placed between
the developed lots and the temporary detention pond.
Wind erosion will be controlled by the curbs and pavement and by the
rainfall erosion control procedures.
Erosion control procedures shall comply with the City of Fort Collins
Criteria.
Westbury P.U.D.
Page 3
A berm will be constructed along the north,
ponding area, and the existing vegetation in the
maintained as much as practical. The shape and
be revised as necessary when drainage design is
final buildout of all the.filings.
east and south sides of the
bottom of the pond will be
size of this ponding area will
done for future sizing, at
The existing 15 inch CMP under South Shields Street will remain as is
until future widening construction of South Shields Street takes place. This
15 inch CMP is at the low point in the borrow ditch, and it must remain open
to carry borrow ditch flows from both the north and south. The Westbury
detention pond outlet pipe, which.is a 12 inch diameter pipe with a 9 inch
diameter restricted opening, will release into the west borrow ditch of South
Shields Street where the flow will combine with the borrow ditch flows from
the north and south. These flows will then drain under South Shields Street
through the existing 15 inch CMP and also through an existing 15 inch RCP which
is located about 70 feet south of. the 15 inch CMP. The invert of the 15 inch
RCP is approximately 1 foot higher than that of the 15 inch CMP, so ponding
occurs before the 15 inch RCP is utilized.
These existing 15 inch pipes:outflow on the east side of South Shields
Street onto the property of the Front Range Community College. An easement
has been obtained from the school districts to allow the swales and storm flows
to cross the school property. Copies of this easement and agreement are
included with this report. The east portion of the swale system across the
Community College property is already in place by construction about ten years
ago. This existing swale system is around the college parking lots and to
the east to tie into the Mail Creek drainageway. A new swale will be
constructed from drainage under�Shields Street to this existing swale. The
release from the Westbury detention pond will be 4.4 c.f.s. which will be added
to existing offsite flows from the Thayer property to the south and the Gress
Gallery property to the north. These combined flows then cross under Shields
Street in the two 15—inch pipes and then through the swale system. The
calculated maximum flow through the two 15—inch pipes is 16.6 c.f.s. If the
Thayer property and Gress Gallery property develop, their allowable runoff
will be reduced to.the 2—year historic amount.
EROSION CONTROL
The Westbury P.U.D. site is located in a high. rainfall erodibility zone,
and in a moderate wind erodibility zone.
The 8.1—acre First Filing will be .developed at this time, and the existing
vegetation will be maintained on the remainder of the site, except in the area
of sanitary sewer construction and the construction of the berm around the
detention pond. The berm will be seeded and mulched.
The concrete and paving will be installed to provide erosion protection,
and the disturbed portions of the rear yards of the lots will be seeded and
mulched.
Westbury P.U.D.
Page 2
9. There is a possibility that storms greater than the 100—year
occurrence will overflow Shields Street, but the downstream swales across the
community college property will accommodate additional flows without causing
damage to buildings.
10. An existing irrigation lateral
site from west to east will be rerouted
This pipe will exit the east side of Lot
easement across the site.
SITE LOCATION AND EXISTING CONDITION
which crosses the north side of the
around the housing in a 12—inch pipe.
15 and will be located in a platted
Westbury P.U.D. is a 24.5—acre site located in the Northeast '—, of Section
3, Township 6 North, Range 69 West, of the Sixth P.M., Fort Collins, Colorado.
The site is "L" shaped and touches West Harmony Road on the north and South
Shields Street on the east. The undeveloped Thayer property lies to the south;
and the Ridge, which is a developed subdivision of large residential lots and
open spaces, is to the west. Also to the west is a 3.1—acre single —residence
tract. The 7—acre Gress Gallery property is located in the "L" to the east
and north. This site has only three residential —type buildings and no paved
streets, so we have considered it undeveloped, with a C.of 0.20.
The Pleasant Valley and Lake Canal ditch crosses the property in a
northwest to southeast direction, and development of that portion of Westbury
lying west of the ditch will require a bridged street crossing. That design
will be a part of future filings.
The existing site is covered with heavy natural grass and alfalfa
vegetation. All that part of the site located east of the Pleasant Valley
and Lake Canal ditch, including the offsite 3.1—acre single —residence tract,
drains to an existing ponding area located along the west side of South Shields
Street at the southeast corner of the Westbury site. The existing Shields
Street roadway is raised and provides the dike for this ponding area. Outflow
from the ponding area is under Shields Street to the east through an existing
15—inch CMP and an existing 15—inch RCP.
PROPOSED DRAINAGE
A temporary detention pond will be constructed in the existing ponding
area located at the southeast corner of the Westbury site. The release rate
from this pond will be the 2—year historic runoff from the total 24.5—acre
Westbury site, which is calculated to be 4.4 c.f.s. A temporary easement will
be dedicated on the unplatted portion of Westbury for this temporary pond and
the flow route from the First Filing to the pond._.. „
The total .volume of the permanent detention pond will not be constructed
for development of the First Filing. A temporary pond will be sized to hold
the developed runoff from the Westbury First Filing, plus the existing,
undeveloped runoff from the 3.1—acre offsite single —residence tract, plus the
10.12—acre undeveloped portion of the Westbury site lying east of the Pleasant
Valley and Lake Canal ditch. We presume no existing flows from the west will
cross the Pleasant Valley and Lake Canal ditch. The volume required for the
First Filing pond is 62457 cubic feet, or 1.43 acre feet.
DRAINAGE AND EROSION CONTROL REPORT
WESTBURY P.U.D.
GENERAL DRAINAGE INFORMATION ABOUT SITE
1. The McClellands and Mail Creek Major Drainageway Plan applies to
this site. The site is located along the southern edge of the basin.
2. There are no major basin improvements planned in the vicinity of
the site.
3. Stormwater release rates permitted in this basin are 2—year historic
flows.
4. The upstream offsite basins consist of 4.1 acres of three (3) large
residential lots and open space in the Ridge subdivision, and of a 3.1—acre
single —residence tract. The 4.1 acres in the Ridge is existing development,
and there is a possibility the 3.1—acre tract may be developed into additional
residential lots.
5. There are no release rate restrictions on the Ridge property; and,
should the 3.1—acre tract be developed, it will require detention and will
be restricted to a 2—year historic release rate. The runoff from the Ridge
and from the existing 3.1—acre tract will be routed through the. Westbury
development via sideline lot easements.
6. The Westbury development will match existing grades on adjoining
sites, and positive flow will be maintained from the adjoining sites.
7. The Pleasant Valley and Lake Canal ditch crosses the Westbury site,
and runoff from new hardsurfaced areas will be carried across the ditch on
a proposed street crossing bridge. (This bridge will be part of a future
filing.)
8. There is an existing well—defined drainage route leaving the site.
This drainage crosses under South Shields Street in two existing 15—inch pipes.
The flow is then across the Front Range Community College property across a
meadow in sheet flow to an existing drainage swale around the college parking
lots. This swale was constructed by the college about ten years ago. It
carries offsite flows as well as parking lot runoff to the. Mail Creek channel.
The runoff from the two 15—inch pipes which now sheet flows across the meadow
will be placed in a channel which will carry it to the south side of the college
property and then easterly along this south side until it turns north to the
existing swale around the parking lots. There is a dedicated easement for
this drainage Swale from Shields Street to Mail Creek, and a copy of this
easement is included in the appendix.
Construction of the Westbury development will not increase the downstream
runoff quantity, although the total volume of runoff will increase due to more
hard surfacing. The proposed detention ponding on the Westbury site will
control flows so that downstream conditions will not be impacted.
STEWART&ASSOCIATES
Consulting Engineers and Surveyors
March 20, 1995
Mr. Basil Hamdan
Stormwater Utility
City of Fort Collins
P.O. Box 580
Fort Collins, CO 80522
Dear Basil:
The following drainage and erosion control report for Westbury Second Filing is an
addition to the report prepared in September of 1994 for Westbury First Filing. The narrative
portion of the 1994 report is included immediately following this cover letter since it provides
information about the total Westbury site.
The paved portion of South Shields Street and the east 100 feet of Westbury Drive is
lower than the proposed 100 year high water line of the detention pond, so this area will not be
piped into the pond but instead will go directly into the outlet pipe under Shields Street.
Also, the back portion of Lots 40, 41, 42, 43, 47, 48, 49, 50, 51, 52, 53 and 54 will drain
directly into the Pleasant Valley and Lake Canal ditch. The developer has received approval from
the ditch company to release this runoff directly into the ditch.
A variance from the City Storm Drainage Criteria is hereby requested to release these
flows undetained.
The design and calculations of storm drainage and erosion control for Westbury Second
Filing complies with City of Fort Collins Criteria.
Sincerely,
Phillip I. Robinson, P.E. & L.S.
Vice President
rsc
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 REPORT
FOR
WESTBURY P.U.D.
SECOND FILING
PREPARED FOR
MARK LINDER
PREPARED BY
STEWART & ASSOCIATES, INC.
103 SOUTH MELDRUM STREET
FORT COLLINS, COLORADO 80521
303/482-9331
MARCH 20, 1995
10