HomeMy WebLinkAboutDrainage Reports - 05/21/1993FINAL DRAINAGE &
EROSION CONTROL REPORT
FOR
DAKOTA PINES P.U.D.
(NORTH SIDE OF HORSETOOTH ROAD
EAST OF TIMBERLINE ROAD)
PREPARED FOR:
DESYN HOMES
CHRIS RAY
3555 STANFORD ROAD
SUITE 102
FORT COLLINS, COLORADO 80525
FEBRUARY 26, 1993
(REVISED AUGUST 2 1993)
PREPARED BY:
PARSONS & ASSOCIATES
CONSULTING ENGINEERS
432 LINK LANE PLAZA
FORT COLLINS, COLORADO 80524
(303) 221-2400
PROJECT NUMBER: 93.02 DKT
TABLE OF CONTENTS
Introduction
1
Site Description
1
Historic Drainage
3
Master Drainage
4
Drainage Criteria
6
Drainage Under Developed Conditions
6
Erosion Control
8
Conclusions and Recommendations
9
Calculations
Appendix A
Erosion Control Calculations
Appendix B
Grading and Drainage Plan
Back Pocket
Figure 1 Vicinity Map 2
Figure 2 Drainage Schematic 5
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FINAL DRAINAGE &
EROSION CONTROL REPORT
FOR
DAKOTA PINES P.U.D.
(NORTH SIDE OF HORSETOOTH ROAD
EAST OF TIMBERLINE ROAD)
FORT COLLINS, COLORADO
Introduction
This drainage report has been prepared along with final engineering drawings to provide
design information for the development of 27 single family residences and 12 townhomes
along the north side of Horsetooth Road just east of its intersection with Arctic Fox Drive.
This report was prepared in conformance with the City of Fort Collins Storm Drainage Design
Criteria and Construction Standards and in conformance with the Master Drainage Study
prepared as part of the Pinecone Overall Development Plan.
Site Description
This study area is located in the Southwest Quarter of Section 29, Township 7 North,
Range 69 West of the 6" Principal Meridian, City of Fort Collins, Larimer County, Colorado
(see Figure 1). Dakota Pines P.U.D. is a 4.81 acre parcel designated as Tract "A" in the
Dakota Ridge P.U.D. final drainage report. The initial construction will provide for 27 single
family residential tracts averaging 6250 square feet and 12 townhome tracts averaging 3000
square feet. The density of development is approximately 8 units per acre which would
classify the area as high density, even though it has been zoned as a Planned Residential
District (R-P).
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i PROJECT SITE
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II
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N. T. S.
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FIGURE I
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The southern boundary of this project is adjacent to Horsetooth Road and the Fox
Meadows Subdivision. The north and west sides are surrounded by the proposed Fort Collins
High School. The eastern boundary runs along Red Mountain Drive, and the Dakota Ridge
Subdivision.
The site has been used as irrigated farm land and planted with various crops. The
fields are typically bare from October through May. Surface drainage and irrigation flow from
southwest to northeast. Grades approach one percent at the southwest corner of the site and
flatten at the eastern edge of the property.
Historic Drainage
Although no development or drainage improvements currently exist on the site,
drainage patterns are controlled by adjacent streets and will flow on to Red Mountain Drive
once it is constructed. Horsetooth Road provides a drainage barrier from runoff to the south.
Flows from the south side of Horsetooth Road and from the Fox Meadows Subdivision are
directed to a detention pond at the southwest corner of Caribou Road and Horsetooth Road.
Flows from the north side of Horsetooth Road will be collected in the curb and gutter, and
flow down Red Mountain Drive.
Timberline Road intercepts runoff from the development to the west and diverts these
flows to the Foothills Basin regional drainage facilities to the north of this site. The centerline
of Timberline Road and the curb and gutter along the west side of the roadway insure that
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runoff is diverted to the north. Flows from the area between the crown of Timberline Road
and Dakota Pines run from west to east where they are intercepted by an existing irrigation
ditches and eventually flow along the Horsetooth curb and gutter.
The runoff from the proposed Fort Collins High School site and commercial Center will
flow to the northeast into detention pond '213'. Berms running north/south along the
western boundary of Dakota Pines establish a drainage barrier between this site and the Fort
Collins High School site. The majority of the runoff to the east from the Dakota Ridge
Subdivision, will collect in a concrete Swale on its eastern boundary which flows into retention
Pond "A" (Figure 2). Pond "A" is for temporary storage only, ultimately pond 214 will receive
stormwater when Dakota Ridge Phase II is completed. Storm flows collected on the west side
of Red Mountain Drive curb and gutter will empty into detention pond '213.
The historic 2-year runoff from the Dakota Pines P.U.D. is 1.4 cfs and the 100-year
is 5.2 cfs. Calculations for the historic runoff are shown in Appendix A.
Master Drainage
Dakota Pines P.U.D. is within the Pinecone Overall Development Plan Drainage Study
which identifies drainage basins and storm water facilities for the entire Pinecone
Development. The heart of this plan is a proposed 36" outfall line which will convey
stormwater from the two major detention ponds which affect this project. The first pond area
(Pond 213) collects water from 109 acres (Basin 62) including the school site, the 15 acre
park site, Tract "A" (Basin A) and other development to the west of Red Mountain Drive. The
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DRAINAGE SCHEMATIC
FIGURE 2
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second area (Pond 214) is proposed to be located at the southeast corner of the overall
Pinecone site and will provide detention for 69 acres of single family residential development
(Basin 64). Both of these ponds will discharge into the proposed 36" outfall line which will
convey releases from detention ponds 213 & 214 to the Fossil Creek Reservoir Ditch
approximately one -quarter mile to the east. The Dakota Pines P.U.D. drainage system was
designed to be in conformance with these guidelines. The Poudre R-1 School District has
contractual obligations with the developers of Dakota Pines and Desyn Homes to perform final
design and construction of both detention pond 213 and the outfall line. Dakota Pines is
designed to function on a temporary basis until the school district finishes these
improvements.
Drainage Criteria
The Rational Formula, as identified in the Fort Collins Storm Drainage Design Criteria
manual will be used to calculate runoff from this site. Manning's formula was used to
determine the capacities of channels, curb sections and pipes. All coefficients, nomographs
and design valves used in this report were provided by the Fort Collins Storm Drainage Design
Criteria manual and "Urban Drainage and Flood Control Criteria" manual.
Drainage Under Developed Conditions
As shown on Figure 2, the Dakota Pines P.U.D. is designated as Tract "A" and Basin
'A' in the Dakota Ridge P.U.D. Final Drainage Report. Flow from this basin will be directed
to detention pond '213' via Red Mountain Drive and enter through curb over topping along
the west flowline or collect at a 15' curb inlet as shown in Figure 2.
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Basin "A"
This basin is broken down into three subbasin which are described below:
Subbasin
Description
Area (Ac)
Q
9100
A-1
North one-half of Horsetooth Road
0.96
2.5
7.5
(750' centerline of parking entrance
to centerline Red Mountain Drive)
A-2
Western Half of Tract 'A'
3.49
5.3
20.8
A-3
Eastern Half of Tract 'A'
1.55
2.9
10.9
A-4
West one-half Red Mountain Drive
(1095' from intersection of Pike Circle
to high point north of sump.)
0.71
1.9
6.7
Total
7.13
9.4
35.1
The Dakota Pines P.U.D. is a high density residential area, and the runoff coefficients
are based on this classification. Runoff from this basin will flow along the west curb line of
Red Mountain Drive to a detention pond being constructed as part of the new Fort Collins
High School project. The initial site grading for detention pond '213' has been completed, and
the outfall pipe is scheduled to be completed in the Fall of 1993. The 100-year water surface
elevation for this pond is 4923.0 ft.-msl. Poudre R-1 school district will maintain these
improvements. The Basin "A" boundaries conform to the southern and eastern boundaries
of Basin '62' as identified in the Pinecone Master Drainage Plan.
All four subbasins ultimately concentrated at the same location (CP #4), the 1 5' curb
inlet. However, Basin 'A' was broken down into four subbasins to provide flows for the street
capacity calculation to compare to.
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The 2- and 100-year flow for fully developed conditions are 9.4 and 35.1 cfs,
respectively. This is an increase over the runoff rates from Dakota Ridge Drainage Report.
A runoff coefficient of 0.45 was used in the Dakota Ridge drainage report which accounts for
the difference in flow.
As stated in the supporting calculations of this report (sheet 11 of 13), the gutter
capacity of Red Mountain Drive is 13.1 cfs each flowline. A total peak flow of 35.1 cfs in
the west flowline is anticipated, additional flows are designed to spill over the top back of
curb and into detention pond 213. This is accomplished by increasing the existing cross -slope
of Red Mountain Drive to 3% (to centerline). This 3% cross -slope will begin at the north end
of Pike Circle and continue past the low point and sump at the 15' inlet. Major storm flows
will concentrate at the curb head and spill to the west, no cross -street flow will be
anticipated, detention pond 213 has adequate capacity to handle these flows and was
originally designed to accommodate all runoff from this area.
Erosion Control
This project is located in an area designated by the City of Fort Collins as having
moderate potential for both wind and water erosion.
Wind Erosion
This property is typically barren ground through the winter months when wind
erosion is the most severe. The construction of improvements in this area will provide
an area less likely to experience wind erosion than the surrounding area. In addition
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the area will be mulched immediately after overlot grading is completed with two ton
of hay or straw applied to each acre and properly anchored.
Water Erosion
A series of curbs will keep runoff controlled on -site. These flows will be routed
to detention pond '213' at the west edge of Red Mountain Drive which will also act
as a sedimentation trap during the construction process.
The sequence of construction for erosion control improvements will be as follows.
1. Complete Overlot Grading.
2. Seed & Mulch Lot Areas.
3. Construct Utilities.
4. Construct Drainage Improvements & Streets.
5. Sod Lot Areas.
Conclusions and Recommendations
Dakota Pines P.U.D. will be included in the Dakota Ridge and proposed Fort Collins
High School storm drainage system. As such, the drainage system is designed to
accommodate this proposed project and function within the overall system. A summary of
the design concepts and proposed improvements which will accomplish that goal follows:
"a
1 . The majority of the individual lots drain towards Pike Circle which will flow into
Red Mountain Drive curb and gutter.
2. Runoff from this site will flow into detention pond '213' on the Fort Collins
High School site.
3. The 1 5' inlet is large enough to handle the 2-year flow from this development
with a capacity of around 14 cfs (sheet 12 of 13).
4. Pike Circle, Horsetooth Road and Red Mountain Drive have the flow capacity
to handle the 2- and 100-year runoffs without effecting property. The
calculations are shown in Appendix A.
5. This site is not located within an established floodway or floodplain.
6. No on -site detention is designated for this area since off -site storage was
planned in the Pinecone O.D.P.
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REFERENCES
1. Storm Drainage Design Criteria and Construction Standards, City of Fort
Collins, May 1984.
2. Urban Storm Drainage Criteria Manual, Urban Drainage and Flood Control
District, March 1969.
3. Topography, Southwest Quarter Section 29, Township 7 North, Range 69
West.
4. Fossil Creek Drainage Basin - Master Drainageway Planning Study, Simons, Li
& Associates, Inc., August 1982.
5. "Final Drainage & Erosion Control Report for Dakota Ridge, P.U.D. Parsons &
Associates Consulting Engineers, July 1992.
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APPENDIX A
CALCULATIONS
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Ft. Co In., ado 80524 MADE BY :/L�' � DATE �/ Z7 .q 3 CNECI�D DATE SHEET I OFF
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ASSOCIATES PROJECT "t>AVDrA- -PiNGS C�ULATIOHS FOR
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FL C.11.. C.b .& 90524
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PARSONS & CLIENT -pee NA1 4\omres JOB NO. 0362 per
F�- ASSOCIATES PROJECT PAY. a- Ytm;=-s Cg CULATIONS FOR Clt
CONSULTING ENGINEERS �{
FL C 11., CDIO,.& 80520 MADE BY DL DA �27 CHECKED DATE SHEET OF -+
PARSONS &
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9�02 DkT
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PROJECT DhYwTjk
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MADE DATE
OT�DIQcD DATE
SHEET OF
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f5=1 PARSONS & CLIENT -De&iN mLL.No. q302 DKT
ASSOCIATES PROJECT DiIgoTA- pIUL:K CucuuTIONS FOR V!UA4�
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FL , Co11 Colm"o 90524 MADE BY 9LE DATE �1�3 CHECKED DATE SNEET OF—L3—
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PROJECT:D�V(3T'F'
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MADE BY � �.F. DATE
CHECKED DATE
FL Coll., Col.,". 84M20
SHEET Oi
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ASSOCIATES PROJECT -VAY'Dv* -Pl~lu-S CALDLILATIONS FOR -P-UNo-T-F
CONSULTING ENGINEERS MADEBY 'OL%. pATt S•31
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APPENDIX B
EROSION CONTROL CALCULATIONS
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RAINFALL PERFORMANCE STANDARD EVALUATION
PROJECT: �AY-C) jA 1 S STANDARD FORM A
COMPLETED BY: /d '�V ANS DATE: 5. ZQrQ3
DEVELOPED ERODIBILITY Asb Lsb Ssb Lb Sb PS
SUBBA�IN ZONE (ac) (ft) M (feet) (%) CO
A 2
3,q4
G 60
Av3
40
A-4
0 . b�b
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MARCH 1991 8-14 DESIGN CRITERIA
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EFFECTIVENESS CALCULATIONS
PROJECT: ppy-01Q 'PINES STANDARD FORM B
COMPLETED BY: "9AN TAUS DATE:
Erosion Control C-Factor P-Factor
Method Value Value Comment
aJAIe� I o o.so 15' cy t� S 1� Gv
C �C %%Zc
AS 61- 1pQ0.01
P �K'1M2n{" O •O l 1 •O '�IrF cIRcL%E
Seed;AC ; AAiAx 0.0(, 1,0 /III *.)js w� ,d Afeez
EisI�Jlx,o��d to (2+Om/0�re.)
aj°,C 9mu c°aer
MAJOR
PS
SUB
AREA
BASIN
(t)
BASIN
(Ac)
CALCULATIONS
- �
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0•65 (o.OG) s O?5(0.01) = o.o4ZS
1.0
4
EFFECTIVENESS CALCULATIONS
PROJECT: -P�VO-TA, ,Q INt 5 STANDARD FORM B
COMPLETED BY: VAh O �&+AN S. DATE: 5.31, 43
Erosion Control C-Factor P-Factor
Method Value Value Comment
�Cw
�5
G.u�e Ldet (ter , p o , s p LP &�s.;, A•A Z,ie
(�0.kat4 trots)
SePdhQ � M�t�� 0.06
Jh,,F- � 0 qll �;sbui�x� A-�co
AA
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D.ue�.nn y 5
MAJOR
PS
SUB
AREA
BASIN
($)
BASIN
(Ac)
CALCULATIONS
79,7
A•3
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A-�
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TABLE >
CONSTRUCTION SEQUENCE
PROJECT: OAXOT.4 PINES STANDARD FORM C
SEQUENCE FOR 19 93 ONLY COMPLETED BY: D.L. -17"S DATE: 2/»/93
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.
.oaa
YEAR
Jana
.rutr
WEEK
f
2
1 s
1 t
5
6
7
6
OVERLOT GRADING
WIND EROSION CONTROL
Soil Roughing
F1
Perimeter Barrier
Additional Barriers
Vegetative Methods
Soil Sealant
Other
RAINFALL EROSION CONTROL
STRUCTURAL,
Sediment Trap/ Basin
Inlet Filters
(In
tulle
I per
Dck)to
idge
Straw Barriers
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
Contour Furrows
Terrocin
Asphalt Concrete Paving
Other
VEGETATIVE:
Permanent Seed Planting
Mulching/ Sealant
Temporary Seed Planting
Sod Installation
III
Nettings/ Mats/ Blankets
Ti
Other I
I
I
DATE SUBMITTED
fPARSONS & CUEivT V n) 4o m 4:5 JOB NO. 4302 � 21-
ASSOCIATES PRWECT -j-->Akz CrtA -Pig'CS CALCULATIONS FOR
CONSULTING ENGINEERS MADE SV DATE �43 CHECKED DATE SHEET OF S
FL r u.. Cobr.do W524
I
t
1
1)
1
1
1
1
1
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T
LOT I] iP.33.3 LOTis
bell^JY4 .J wr l l
ihJJ.� PT•
1 m
y"III I T VD
11 IIII It I Z LOr n NE
Let I I IIIJ 32 / JA
II IiI LOi 1 LO
vv I � � III I o 1 LDTI, I I
L✓
\ I III I II V LOT xx _Y
VIII I I `I\ I a l ore I I
I
I I LOT 14 I LOT ¢ 111 1 L
we I ILOT
LOT 25
LOT eLOT
♦ I I \ I ___J L —
Lori] "'UM
1 ) 1A NE
L
- -. OL L I LO JS
I i I LOT N
I�LOT A 0 I LOT 37
Or LD 34�.
LOT DO
LOT b
IT
` n LOT 31 I - 1.55 AL
1➢i ]9
37
S t
I
--Tit
II
I ,-----IT--—,31
2 X
4
3 III Ij
I —
it
II
5 aJ At II II
II
LE
H p, C�O_CHE�TOPAACOURT
- AMID Dsnxc aDLwAu1, J UUcnt°T 5uUMT
none
Teel
E. HORSETOOTH ROAD
MEADOWS SUBD.
I I
\ I I
M all
1
\
It
\ PIKE CIRCLE SOUTH Ad
LOT 27 \ — u _
m NO. MIT AN 20
sex ALL Awr sto
All
1
LOT 28 LOT 32
—� LOT 136 I
�y
1TI33 i t--
LOT 29
�� s LOTI 37
i LOTI 34
LOT 30
LOT I38
LOT 35
b F—
LOT 31 }
LOT 1,39
XO"D
Au PIwSyEO nopts el
BE GRACED AT A uMIYUS Cf
ID; ME TIE ngsr s AwAY
PENN NNE ELVIWATM.
LOT ZJ
LOT 29 9I op
LOT 29 r
NO
LOT 30 —
II I II LOT 31
pp II B' e'
II( II
I II I I T—
III I '
IIII I�
I AM 4 0, TAELEB
AM C 0 AM
A-3 J 10 lag
A-4 IA 42
a,- 5-
0.0 JU
0�- Z5
- GRADING PLAN
GRAPHIC SCALE
1 by AT My
I lmp .50M1
unto
PARSONS & ASSOCIATES
432 Link LINE/ Plan. EN CONSULTING ENGINEERS FL Collins, Colofado 80524
(303) 221-2400
TABLE E
COASTRLLTfON SdpUdAE'S
PW GLBDIM KV♦s Jr/.xD PORK G
LEaMENCE Flat It -ALONLY gRIPIERp BF at IPLY9 DAM: �.M
NIIa AN, by ai N a x e �e or . II Mm, om M.imiSA ol be md ee
i.e may . F Wmivan. Ir e oli io•• SI> mama ran Lo vh,al , mwo.>» xr os my Eremi,.
MIND EROSION CONTROL
SON RVShbq
Poll Banp
Rol III
i•mlbe Methods
sop Sea Onl
Other
RAINEAL. LED JOIN CONTROL
a INUTTRAC
SM l Trap/ Bash
t FNtne (Im
Sera, sorrow.
St Een.e Boners
Nora I
Bare Sol Prepcmem
Cmlour lunar
Intoelna
@n:roN/ Caro.. FAI
VEOETAnIE:
Formal Seed Fla
NN9
RUIchNg/ smiant
Send
Tom WICIII Sid PlmelE
Sod
Nothe %�I MankW
Ormer
DATE SUeulrrm
GRAPHIC SCALE rn.0
r ....A - I 0I �%NA Fn
\ Re/ Ne. /
� I I '
HIGH OMT
n- 333x
nIW ;
\� \ PIKE CIRCLE SOUTH R�
\ yen
RA
960 µB
e2e'
LOT 32 El£VATCNS ARE FOR REFERENCE ONLY
_ LOT 3s n2IC T OVERLOT GRADING PAN
NOT TO SCALE
e LOT 3J b f Y H ,
zt a _ LOT 3] I SEEDMIR P.L. :.,ril,Ii All
LOT 34 o r RECOMENDED MIXED
POUNDS OF PERCENTPOUNDSb SPECIES PTW/AC OF
Ls/ACRE OP MI% /ACRE
IS' $' SO.DY LOT SS SMOOTH B WxEATGRAss 16.9 T SMOOTH BNOME 10 1 35
20
LOT }S a- 1¢ fl SIDQOATS GpARA .9 x0 212
„ f TOTAL 100 17,6
B' LOT 39
ry b SEED MIXTURES MR SITES WITH DISTINCTIVE SOIL PROBLEMS (E.E.,
ALXALINITY, SALINITY OR RUSH RATER TABLE) SHOULD BE DEVELOPED BY A
TRAINED SPECIALIST.
mMULCH (ALL DISTORDED AREAS)
ONE OR MORE OF TX6 POLLOMING MULCHES MALL BE USED WITH A PERENNIAL
DRYESND GRASS SEED MIXTURE.
MULCH ACCEPTABLE -
DATES OF USE APPLICATION RATE
STRAW OR MAY DAN. 01 - DEC. 31
HYDRAULIC
2 TONS/ACRE
EROSION CONTROL) MR' 151 W'y 15 2 T Ns/ACRE
p (HATS OR BLVINETS) .SAN. 01 - DEC NOT APPLICABLE
/ ^/�A BAY OR STRAW MULCH SMALL BE FREE OP NOXIOUS NERDS AND AT LEAST 50%
//'r WITH OF THE PSMALL OF 10 INCXES 09 MORE IN L&YGTX. WHEN SEEDING
NATIVE GRASSES, MAY MGM A NATIVE GRASS Z SUGGESTED
% MULCHING MATERIAL, IF AVAILABLE. 5 A
pcn
/ - FERTTLIZER REQUHiEMENTS (ALL DISTURBED AREAS)
SITES WILL BE FERTILIZED ACMIXE Tp 2ABpgA'FORy SOIL ANALYSIS
-- AND RECOFWMN TION.
1 -- 2. IFAPPROVED BY ME CITY OPWP COLLINS, IX ABSENCE OF A SOIL
ANALYSIS, OF A MINIMUM OF AO UNOS OF AVAILABLE N'TR M END 40
POI1Np5 OF AVAILABLE P
A PHOSPHORUS RILL BE PLIED PER ACRE.
93.02-DKT
heat
AU6 0 g 19g3
DAKOTA PINES P. U.D.
4
GRADING, DRAINAGE, &EROSION CONTROL PLAN 5