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FINAL DRAINAGE STUDY
AND
EROSION CONTROL REPORT
FOR
RIGDEN FARM FILING THREE,
PARKSIDE WEST
Prepared For:
Parkside Homes
1501 Academy Court
Suite 203
Fort Collins, CO 80524
(970)407-9551
Date: September 6, 2001
Project No. 0048
Consulting Engineer:
Loonan and Associates, Inc.
1630 South College Ave.
P.O. Box 270852
Fort Collins, CO 80527
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P 0. box 270952
5767e , e0 90527
(970) 493-2808
57, Z (970) 495- 9735
August 3, 2001
Mr. Glenn Schlueter
City of Fort Collins
Stor mwater Utility Department
700 Wood Street
Fort Collins, CO 80522
Dear Mr. Schlueter:
On behalf of our client we are submitting the attached Final Drainage Study for
Rigden Farm Filing Three, Parkside West. The purpose of this report is to evaluate and
present the drainage impacts from the proposed Construction of Rigden Farm Filing
Three, Parkside West. The drainage report assesses the changes to the developed flow'
conditions and proposed improvements to resolve the impacts of the drainage flow
condition.
The Final Drainage Study for Rigden Farm Filing Three, Parkside West was
' prepared in accordance with the provisions of the City of Fort Collins Storm Drainage
Criteria —revised January 1997.
Loonan and Associates, Inc.
Tames R. LoonM, P.E"
Registered Professional
Colorado P.E. 19195
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Table of Contents
U
Introduction................................. ..............................................page 1
ExistingCondition.........................................................................page 1
1
Drainage Impact...........................................................................page 1
Proposed Site Conditions
Major Drainage Basins
Offsite Basins
Onsite Basins
1 Offsite Runoff.............................................................................page 2
'
Onsite Runoff..............................................................................page 2
Conclusion.................................................................................page 3
Erosion and Sediment Control ..........................................................page 3
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APPENDIX A
Final Drainage Study
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FINAL DRAINAGE STUDY
FOR
PARKSIDE WEST AT RIGDEN FARM
introduction
Parkside West at Rigden Farm is a proposed multi -family residential subdivision in the
City of Fort Collins, Colorado. The site is generally located on the South side of East
Drake Road midway between Timberline Road and County Road 9. The entire Rigden
Farm development consists of the majority of the North'/2 of Section 29, T7N, R68W,
Sixth Principal Meridian, Larimer County, Colorado. Parkside West at Rigden Faun
consists of approximately 3.22 acres located west of Rigden Parkway between Drake
Road and Limon Drive.
The purpose of this Final Drainage Study is to evaluate and present the drainage impacts
from Parkside West at Rigden Farm. In the evaluation, a site description of the project
and its relationship to the Rigden Farm development will be presented. This Final
Drainage Study presents the changes to the developed flow condition and proposed
improvements to resolve the impact of the developed flow condition. This Final
Drainage Report demonstrates compliance with the approved final "Drainage and Erosion
'
Control Report for Rigden Farm Filing One, P.D.P," dated September 30, 1999, by JR
Engineering.
'
Existing Condition Description
'
Currently the ground is gently sloping and covered with native grass. The site is bound by
Rigden Parkway on the East, Drake Road on the North, Limon Drive on the South and
Rockford Drive on the West.
In its' present state, the site slopes from the West to the East at approximately 1.5%. The
current runoff drains East and South into Pond 216 (from JR's Filing One report). Pond
216 is being built by the developers of Rigden Farm. This pond provides the Detention
and water quality for this site.
The North Tributary System combines with the 24-inch culvert under Rigden Parkway
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almost immediately downstream of Rigden Parkway. JR Engineering's ultimate design
for the Rigden Parkway — Drake Road intersection calls for the drainage swale and
culverts parallel to Drake to be removed and replaced by Drake Road curb and gutter
conveying storm flows to new inlets on Rigden parkway, which in turn discharge into the
North Tributary System. In effect, the swale and culverts are temporary or interim. The
'
North Tributary System conveys all flows from the north part of the site.
The developed runoff from this site has been accounted for in the "Drainage and Erosion
Control Report for Rigden Farm Filing One, P.D.P," dated September 30, 1999, by JR
'
Engineering. Please refer to attached excerpts from their study that is located in
Appendix A.
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Drainage Impact
Proposed Site Conditions
Parkside West at Rigden Farm consists of 8 buildings with 6 dwelling units each, for a
total of 48 residential units. In addition to the 8 residential buildings, there are 6 garage
buildings. The proposed development is accessed from Rigden Parkway and Rockford
Drive.
Major Drainage Basins
Parkside West at Rigden Farm lies within Reach 2 of the Foothills Basin.
Offsite Basins
Due to the construction of the adjacent streets, there are no offsite drainage basins that
enter this site.
Onsite Basins
Sub -basins A and B- These sub -basins makeup the southwest 0.28 acre portion of the site
that drains onto Rockford Drive and then onto that portion of Limon Drive
that drains west. The basin's proposed land use consists of'h of one multi-
family building, a portion of one garage, and a portion of an asphalt
parking lot with the remainder being landscaped.
Sub -basins C, D, E, and F- These sub -basins makeup the southeast 1.37 acre portion of
the site that drains onto that portion of Limon Drive that drains east onto
Rigden Parkway. The basins proposed land use consists of several multi-
family buildings and garages, asphalt driveways and parking, with the
remainder being landscaped.
Sub -basin G- These sub -basins makeup the northwestern 0.37 acre portion of the site that
drains to a proposed inlet in Rockford Drive. The basin's proposed land
use consists of a portion of several multi -family buildings with the
remainder being landscaped.
Sub -basins H, I, and J- These sub -basins makeup the northeastern 1.20 acre portion of the
site that drains to an existing 24" culvert under Rigden Parkway at Drake
Road. The basins' proposed land use consists of multi -family buildings
and garages with the remainder being landscaped.
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OFFSITE RUNOFF
There is no offsite runoff that enters this site.
ONSITE RUNOFF
The runoff produced from the 10 onfite basins drains into the Rigden Farm Filing One
storm system.
Sub -basins A and B- These sub -basins will drain onto Rockford Drive and then onto that
portion of Limon Drive that drains west. The Drainage and Erosion
Control Report for Rigden Farm Filing One assumed 0.28 acres from this
site would drain onto Limon Drive and head west. Sub -basins A and B
consists of 0.28 acres, with a composite C of 0.75.
Sub -basins C, D, E, and F- These sub -basins will drain onto Rigden Parkway or that
portion of Limon Drive that drains east to Rigden Parkway. The Drainage
and Erosion Control Report for Rigden Farm Filing One assumed 1.34
acres from this site would drain onto Limon Drive and head east to Rigden
Parkway. Sub -basins C, D, E, and F consist of 1.37 acres, with a
composite C of 0.70.
Sub -basin G- This sub -basin will drain westerly onto Rockford Drive. The storm system
in Rockford Drive is designed to convey the runoff from this sub -basin to
the existing storm system in Drake Road (North Tributary Storm Sewer).
Sub -basins H, I, and J - These sub -basins will drain northerly to the roadside swale
adjacent to Drake Road. This swale drains easterly into the North
Tributary Storm Sewer before conveying all flows under Rigden Parkway.
According to the Drainage and Erosion Control Report for Rigden Farm
Filing One, the North Tributary Storm Sewer is sized to accommodate
runoff flows from the developed area using a design capacity of 23.21 cfs.
The combined runoff from these basins including sub -basin G is 11.09 cfs
using a composite C of 0.76. The North Tributary System combines with
the 24-inch culvert under Rigden Parkway almost immediately downstream
of Rigden Parkway. JR Engineering's ultimate design for the Rigden
Parkway — Drake Road intersection calls for the drainage swale and
culverts parallel to Drake to be removed and replaced by Drake Road curb
and gutter conveying storm flows to new inlets on Rigden parkway, which
in turn discharge into the North Tributary System. In effect, the swale and
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culverts are temporary or interim. The North Tributary System conveys all
flows from Basins H, I & J.
CONCLUSION
The runoff that will be produced by Parkside West at Rigden Farm has been accounted
for. More area will drain to the inlet at DP 6 than was previously calculated in the
Drainage Report for Rigden Farm Filing One. However, the increase area is only 2%
from this site and less than '/z of one percent of the entire area for sub -basin 111 (5.61
acres).
EROSION AND SEDIMENT CONTROL
This report describes methods which are recommended to control wind erosion, water
erosion and sediment during and after the construction of drainage structures and site
grading.
DISCUSSION
The clearing and stripping of land for site grading, overlot grading, or for the construction
of drainage structures, may cause localized erosion rates with subsequent deposition and
damage to offsite properties. Uncontrolled, such erosion could destroy the aesthetic and
practical values of individual sites, and cause damage to downstream property.
In general, erosion and sediment control measures will consist of minimizing soil
exposure, control runoff across exposed areas, and sediment control at drainage
structures. Each of these measures is described below and shall be utilized by the
developer and/or the contractor during any construction activity that occurs at this site.
GENERAL EROSION AND SEDIMENT CONTROL MEASURES
Minimizing Soil Exposure: The construction area and duration of soil exposure shall be
kept to a minimum. All other areas shall have a good cover of vegetation or mulch.
Grading shall be completed as soon as possible after commencement. A temporary cover
crop, a permanent vegetative cover crop, or other landscaping shall be established in the
disturbed areas. Re -vegetation shall consist of native grasses, lawn grasses, or various
winter wheat. Decorative rock, flower gardens, or shrubs shall also be utilized in the final
landscaping to cover the soil. Re -seeded areas shall be mulched with straw or hay to
protect exposed soil until vegetation is established.
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' EROSION CONTROL PLAN
The proposed erosion control measures are presented on the Grading and Erosion Control
Plan located in the Appendix of this report.
1 In summary, the erosion control measures consist of:
1. Temporary seeding on all of the land to be developed
2. Inlet protection at every inlet
3. Silt fences installed on the Eastern side of the development
' 4. Vehicle tracking control
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APPENDIX A
Final Drainage Study
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' Parkside West
concrete &
sub -basin asphalt roof lawn area C-2yr C-100yr
a
0.081
0.01
0.05
0.14
0.70
0.88
b
0.01
0.04
0.06
0.11
0.57
0.71
c
0.02
0.08
0.14
0.24
0.54
0.68
d
0.22
0.34
0.17
0.73
0.79
0.98
e
0.01
0.02
0.06
0.09
0.48
0.60
f
0.01
0.06
0.16
0.231
0.46
0.58
9
0.01
0.08
0.23
0.32
0.45
0.56
h
0.01
0.08
0.12
0.21
0.55
0.69
1
0.01
0.09
0.13
0.23
0.55
0.69
j
0.01
0.08
0.18
0.27
0.48
0.60
k
0.38
0.05
0.22
0.65
0.71
0.89
Totals 1
0.771
0.931
1.521
3.221
0.65
0.81
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MAY 1984
R-M-P Medium Density Planned Residential District — designation for medium density
areas planned as a unit (PUD) to provide a variation in use and building placements
with a minimum lot area of 6,000 square feet.
R-L-M Low Density Multiple Family District— areas containing low density multiple family
units or any other use in the R-L District with a minimum lot areaof 6,000 square feet
for one -family or two-family dwellings and 9,000 square feet Jor multiple -family
dwellings.
M-L Low Density Mobile Home District — designation for areas for mobile home parks
containing independent mobile homes not exceeding 6 units per acre.
M-M Medium Density Mobile Home District — designation for areas of mobile home
parks containing independent mobile homes not exceeding 12 ynits per acre.
B-G General Business District — district designation for downtown business areas,
including a variety of permitted uses, with minimum lot areas equal to 1 /2 of the total
floor area of the building.
B-P Planned Business District — designates areas planned as unit developments to
provide business services while protecting the surrounding residential areas with
minumum lot areas the same as R-M.
H-B Highway Business District — designates an area of automobile -orientated busi-
nesses with a minimum lot area equal to 112 of the total floor area of the building.
B-L Limited Business District — designates areas for neighborhood convenience
centers, including a variety of community uses with minimum lot areas equal to two
times the total floor area of the building.
C Commercial District —designates areas of commercial, service and storage areas.
1-L Limited Industrial District —designates areas of light industrial uses with a minimum
area of lot equal to two times the total floor area of the building not to be less than
20,000 square feet
I-P Industrial Park District —designates light industrial park areas containing controlled
industrial uses with minimum lot areas equal to two times the total floor area of the
building not to be less than 20,000 square feet.
I-G General Industrial District —designates areas of major industrial development.
T Transition District — designates areas which are in a transitional stage with regard
to ultimate development.
For current and more explicit definitions of land uses and zoning classifications, refer to the
Code of the City of Fort Collins, Chapters 99 and 118.
Table 3-3
RATIONAL METHOD RUNOFF COEFFICIENTS FOR COMPOSITE ANALYSIS
Character of Surtax Runoff Coefficient
Streets, Parking Lots, Drives:
Asphalt................................................................................................ 0.95
Concrete............................................................................................. 0.95
Gravel................................................................................................. 0.50
Roofs..........................................................................................................
Lawns, Sandy Soil:
Flat<2'/e.............................................................................................
Average2 to 7%..................................................................................
Steep>7'/...................................................................................:.......
Lawns, Heavy Soil:
Flat<2%.............................................................................................
Average2 to 7%..................................................................................
Steep>7%.....................................................:....................................
3-4
0.95
0.10
0.15
0.20
0.20
0.25
0.35
DESIGN CRITERIA
' 3.1.7 Time of Concentration
In order to use the Rainfall Intensity Duration Curve, the time of concentration must be
known. This can be determined either by the following equation or the "Overland Time of
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Flow Curves' from the Urban Storm Drainage Criteria Manual, included in this report (See
Figure 3-2).
'
Tc=1.87 (1.1 —CC,) D`2
S�
Where Tc =Time of Concentration, minutes
S = Slope of Basin, % i
'
C = Rational Method Runoff Coefficient
D = Length of Basin, feet
Ct = Frequency Adjustment Factor I
'
Time of concentration calculations should reflect channel and storm sewer velocities as well
as overland flow times. i
3.1.8 Adjustment for Infrequent Storms
'
The preceding variables are based on the initial storm, thatis, the two to ten year storms. For
storms with higher intensities an adjustment of the runoff troefficient is required because of
the lessening amount of infiltration, depression retention, and other losses that have a
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proportionally smaller effect on storm runoff.
These frequency adjustment factors are found in Table 3
Table 3-4
RATIONAL METHOD FREQUENCY ADJUSTMENT FACTORS
Storm Return Period Frequency Factor
'
(years) C,
2 to 10 1.00
11 to 25 1.10
26 to 50 1.20
51 to 100 1.25
Note: The product of C times C, shall not exceed 1.00
3.2 Analysis Methodology I
The methods presented in this section will be instituted for use in thg determination and/or verification
of runoff at specific design points in the drainage system. These methods are (1), the Rational Method
and (2) the Colorado Urban Hydrograph Procedure (CUHP). Other computer methods, such as
SWMM, STORM, and HEC-1 are allowable if results are not radically different than these two. Where
applicable, drainage systems proposed for construction should provide the minimum protection as
determined by the methodology so mentioned above.
3.2.1 Rational Method
For drainage basins of 200 acres or less, the runoff may be calculated by the Rational
'
Method, which is essentially the following equation:
Q = C,CIA I
Where Q = Flow Quantitycfs
'
A =Total Area of Basin, acres
Ct = Storm Frequency Adjustment Factor (See Section 3.1.8)
C = Runoff Coefficient (See Section 3.1.6) I
I = Rainfall Intensity, inches per hour (See Section 3.1.4)
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3.2.2 Colorado Urban Hydrograph Procedure
For basins larger than 200 acres, the design storm runoff should be analyzed by deriving
'
synthetic unit hydrographs. It is recommended that the Colorado Urban Hydrograph
Procedure be used for such anaiysis. This procedure is detailed in the Urban Storm Drainage
Criteria Manual, Volumed , Section 4.
MAY 1984 3-5
DESIGN CRr rERIA
DRAINAGE CRITERIA MANUAL
RUNOFF
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VELOCITY IN FEET PER SECOND
FIGURE 3-2. ESTIMATE OF AVERAGE FLOW VELOCITY FOR
USE WITH THE RATIONAL FORMULA.
*MOST FREQUENTLY OCCURRING "UNDEVELOPED"
LAND SURFACES IN THE DENVER REGION.
REFERENCE: "Urban Hydrology For Small Watersheds" Technical
Release No. 55. USDA, SCS Jan. 1975,
5 -1-84
URBAN DRAINAGE & FLOOD CONTROL DISTRICT
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City of Fort Collins
Rainfall Intensity -Duration -Frequency Table
for using the Rational Method
(5 minutes - 30 minutes)
Figure 3-1a
Duration
(minutes)
2-year
Intensity
in/hr
10-year
Intensity
in/hr
100-year
Intensity
in/hr
5.00
2.85
4.87
9.95
6.00
2.67
4.56
9.31
7.00
2.52
4.31
8.80
8.00
2.40
4.10
8.38
9.00
2.30
3.93
8.03
10.00
2.21
3.78
7.72
11.00
2.13
3.63
7.42
12.00
2.05
3.50
7.16
13.00
1.98
3.39
6.92
14.00
1.92
3.29
6.71
15.00
1.87
3.19
6.52
16.00
1.81
3.08
6.30
17.00
1.75
2.99
6.10
18.00
1.70
2.90
5.92
19.00
1.65
2.82
5.75
20.00
1.61
2.74
5.60
21.00
1.56
2.67
5.46
22.00
1.53
2.61
5.32
23.00
1.49
2.55
5.20
24.00
1.46
2.49
5.09
25.00
1.43
2.44
4.98
26.00
1.40
2.39
4.87
27.00
1.37
.2.34
4.78
28.00
1.34
2.29
4.69
29.00
1.32
2.25
4.60
30.00
1.30
2.21
4.52
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' Project Title: RIGDEN FARM Project Engineer: JR ENGINEERING. LTD.
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' 07/26/99 02:22:48 PM 0 Haestad Methods, Inc. 37 Brookside Road Waterbury, CT 06708 USA (203) 755.1666 Page 1 of 1
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No Text
' swoo !'1
TRAPEZOIDAL CHANNEL ANALYSIS
' RATING CURVE COMPUTATION
December 20, 2000
PROGRAM INPUT DATA
DESCRIPTION VALUE
--------------------------------------------------------------------------------
Channel Bottom Slope(ft/ft)................................ 0.01
Manning's Roughness Coefficient (n-value)................... 0.027
Channel Left Side Slope (horizontal/vertical)............... 4.0
Channel Right Side Slope (horizontal/vertical).............. 4.0
' Channel Bottom Width(ft).................................... 1.0
Minimum Flow Depth(ft)..................................... 0.1
Maximum Flow Depth(ft).......... ....:...................... 1.0
Incremental Head(ft)....................................... 0.1
COMPUTATION RESULTS
Flow Flow Flow Froude Velocity Energy Flow Top
' Depth Rate Velocity Number Head Head Area Width
(ft) (cfs) (fps) (ft) (ft) (sq ft) (ft)
--------------------------------------------------------------------------------
0.1 0.14 0.99 0.628 0.015 0.115 0.14 1.8
0.2 0.52 1.45 0.689 0.033 0.233 0.36 2.6
0.3 1.2 1.82 0.728 0.051 0.351 0.66 3.4
-__-.- n 4 99 7 14 n 757 0071 n A71 1 n4 42 1 1(jFI
0.5 3.64 2.43 0.781 0.092 0.592 1.5 5.0
0.6 5.5 2.7 0.802 0.113 0.713 2.04 5.8
0.7 7.85 2.95 0.82 0.135 0.835 2.66 6.6
0.8 10.73 3.19 0.836 0.159 0.959 3.36 7.4
0.9 14.19 3.43 0.851 0.183 1.083 4.14 8.2
' 1.0 18.26 3.65 0.864 0.207 1.207 5.0 9.0
HYDROCALC Hydraulics for Windows, Version 1.0 Copyright (c) 1996
Dodson & Associates, Inc., 5629 FM 1960 West, Suite 314, Houston, TX 77069
Phone:(281)440-3787, Fax:(281)440-4742, Email:software@dodson-hydro.com
All Rights Reserved.
4 i
N
or
1
/TU 4 �O
EFFECTIVENESS CALCULATIONS
PROJECT: STANDARD FORM B
COMPLETED BY: DATE:
Erosion Control C-Factor P-Factor
Method Value Value Comment
L
{J /1u
MAJOR
PS
SUB
AREA
BASIN
($)
BASIN
(Ac)
CALCULATIONS
s
f v - Z
-
7- Z
s2
MARCH 1991 8-15 DESIGN CRITERIA
iCONSTRUCTION
SEQUENCE
PROJECT:
�jY x fl,' 6OEN // 1
STANDARD FORM C
SEQUENCE
FOR T9-2�''' / ONLY COMPLETED BY: `'
DATE: i
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
by the City Engineer.
,approval
MONTHYEAR 1�
ir'1117i
15�7�
OVERLOT GRADING
,WIND EROSION CONTROL
Soil Roughening
Perimeter Barrier
Additional Barriers
' Vegetative Methods
Soil Sealant
Other
IRAINFALL EROSION CONTROL
STRUCTURAL:
' Sediment Trap/Basin
Inlet Filters
Straw Barriers
Silt Fence Barriers
Sand Bags
Bare Soil Preparation
I Contour Furrows
Terracing
Asphalt/Concrete Paving
Other
1
VEGETATIVE:
' Permanent Seed Planting
Mulching/Sealant
Temporary Seed Planting
' Sod Installation
Nettings/Mats/Blankets
Other
STRUCTURES: INSTALLED BY
MAINTAINED BY .
VEGETATION/MULCHING CONTRACTOR
I
DATE SUBMITTED
APPROVED BY CITY OF FORT COLLINS ON
MARCH 1991 8-16 DESIGN CRITERIA
'Z / 9
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STORM DRAINA(
IMPROVEMENT
SEE DESIGN E
JR ENGINEERIP
B
1
HP
M
Q
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02 war 0.48 ch HP
0100 .-2.09�_
\
edge of asphalt (typ) F R PROPOSED STORM CONTROL NOTES
S WER SEE REVISED DESIGN NON -KRILL SE SNGAND IO
1. I, IS IXL EROSION
AND EDI THE DEVELOPER T FOR OFIIXL iM WIMAIµM4 ♦ DRILL SEEDING NMO NYORO MULCHING U
B J.R. ENGINEERING / PD uuiR DURING oolJ55UUC l � ME oT[caa YM MAAU DOLL SEED Au Max-IRRIu,R GRASS SEED BY PUNS Or PRE�
E LOCAL AREAS WHICH ARE VUME A LC ED EROSION AND YECHMML F R DRAWN DOLL SMORS (MOT BRIWON SEEDER) p1 3
SLL LAKE NECESSARY MEASURES TO PROTECT OHSRE AND OFFSPC EOLLOMO BY Pi WHEELS OR DRAG CHAINS, SEED A, THE RATES C 0 MY
J PROPERTY. SHOWN. SEED IN TWO PASSES AT RIGHT ANGLES TO ONE AMOMR. T or
winner
RKERS $
SOW HAU THE NEED IN EACH PASS. PROVIDE MAOR OTHER 0
2. THE CONTRACTOR SHALL INSTALL A NET FENCE ALONG THE MUMS TO ASSURE. THAT ME SUCCESSIVE SEEDED STRIPS WILL a
y6
SOUTH AND EAST Ul M ME PROPOSED DISMRYO AREAS PRIOR OVERLAP OR BE SEPARATED BY A SPACE NO GREATER THAN THE SPACE j R LL
1W ` TO BEGINNING MY OVERLOT GRA , ME SILT FENCE SMALL BE BETWEEN ME BOXES PLANTER BY THE COUIPWRT BEING US[O. [n
D2 seI54 CBS L W N ED 70 PROTECT AwACLM, MIOPLRIY TOM UNMEC AnON, SEED WRING W.XDY WEATHER. 8
^ AMO OBLAIMP D UNTIL THE CONTRACTOR INSIN
C OORNWTR TRIM R OPIpVLL FRgL.ME CM Or FORT f. ELM "-IRRIGATED SU9i AREAS. 00 NET SOW SEED ELM TREE DR
THEY SHALL NO, BE RE $$$$
-/ CO Dl SHRUB WATERING RINGS. J = a A
S. MEASURES SHALL BE UNDERTAKEN SPILLAGE ,0 F,HE MI-5BL SOIL YYLCMIXC{pCOU RCD fOR TEMP. SE[NXLj: Y
WALKTE OMU DO D O[N6 NFROM VLMMIEE LRV XO U Z m
M[ SITE D AND DENNISDEDS SHALL TO TILACKFD AIOXG MULCH FOLLOWING SOIL [ yAD
-- ROADWAYS AHD/OP PAVED STREETS. J z
\ i0 C MURD-MULL AREAS WMMX HAVE BEEN ORAL
- \ ALL DISTURBED AREA NOT N BULONL SIDEMIX A pOAOCA$i SEC ORR ENI3 TO iWY A HOMOGENEOUS 0
I -- - PEAR W OR ROADWAY SHALL BE MU SRpR WITH DROUGHT SLURRY, LUNG ITHE COLD OF ,HE MULCH AS A Y[ G[M. LL 2
54' R A ,p[RANT WM RRGA,ED TIME. SPRAY THE RR MIXTURE UXFCRYLY GVER THE DCSGNATEO y O.
SEEDED AREA Ll'R
5. INSTALL STRA1E W TALL BARRIER Al ME STARCOLUMNS
M CORRUCEMOVA . B. THE MIXTURE SHALL BE WLIR AT A RATE RECOMMENDED BY
LOMDIWTL WITH iX[ CM OF [DEAL GOWNS FOR R[YMLL. THE YAMUFACTURER.
v I 2 I B. GENERAL EROSION CONTROL CONSTRUCTION PLAN NOTES. CRT
W FORT COLLINS, IULY 1995, MYGPo-MULCHING SHALL HOT BE DOME IN THE PRESENCE OF
12- ^IYItJ C AND
WATER OR MIGN v ft THOROUGHLY CLEAN OVEnPUY AREASIZS
� W)ME A ME LT OF FORT COONS SMRYWATR =I EROSION D SRC AY[Ni1[5 Afi(R 11 t[MIML.
inv 99999 v^^�V .492E COryrpp INSREaM MUST BE WTmm AT LEAST 24 HOURS MIOR GO F4
1 - PAN /m 1 I in V i(QiT 4919 To ANY CONSTRUCTION ON THIS s1R. PROJRn CPTI ,ION SEQUENCE w py s I
E 0.5% / 11 I PAN B. ALL REQUIRED PERIMETER SILT ILMCI IO SHALL BE INSTALLED PMKSIOL WEST L1 rE I
F 0 f0. S i yI pppI� PRIOR TO ANY LAND DISTURBING ACTIVITY (STOCKPILI MABOARD POKY C SEQUENCE D� 1999 ONLY. COMPLETED BY: ANY
W
N PAN J RM D jJIAGE STRIPPING. GRACING. ETC.). ALL OTHER REWIRED EROSION V X S < b
TOFF I e I eo sr. I IMPROV MEINTS CONTROL MEASURES sxau BE Ixs,LLuo AT ML ARROP mATROEamE--.-aATn AnCannD ? �' M
♦92). ` 1 G` l E CONSTRUCTION SEQUENCE AS INDICATED IN THE m y D+ p
\ �M 19 .10 J I EE DE GIV BY PROJECT SCHEDULE. COMTR PH P4Ns. AND EROSION CONTROL mp WMMay use of a Nor Ime or symKal imm, ..n.ian AW CUN { J Of U I
REMU. to As InIll MWjor XTI NicWNm ban Y} y d F
o I 4127.00 1 J) ENGINIEE RING c Ro-DlmlRuxD vEcnAnM sxAu D rrtorzcTED Ax0 ae>�Wa".�a9 BCnedale may re9a m6mlxlm A m, mhat Far MIN
. z% ••• ? = g'SC
n'/ I I RETAINED WHEREVER PO KE. REMOVAL OR DISTURBANCE Or
W EY MB CITY Engine¢ p U O
1 1 I EXISTING VEGLRnOM SMALL UNITED TO ME Ru REQUIRED FOR CONCRETE BE=11 in BE
IMMEDIATE CONSTRUCTION OPERATIONS. D FOR THE SHORWs RETAINING WALL \. 4
` y will $ I PRACTICAL PERIOD Of TIME Tip '1 Y
p. AsOILs EXPOSED WRING "NO DISTURBING ACTIVITY p TV g
(S DUNG. GRADING. CroryIMrALYTIOMs. STMKPWW
/ ILL\ ALL. IFILLING. L2.J SHALL BE KEPT IN A ROUGHEN CONDITION BY or
RMPIML M DIMING ALONG LAND COXNURS UNTIL MULCH. k- T, � VEBQATICN. OR OTHER KE Exr EROSION CONTROL IS INSTALLED. V NTH. P
.27 ( _a ow \\ MO MADE IN MUD* OUTSIDE PROJECT SRE[T RIGHT M WAY SWLL I
II I REMAIN EXPOSED BY "No DISTURBING ACTIVITY FOR WERE MANE 9'I' f
I!� y BE in
�. 4 j II. EROSION WLR EWAED,M.DRARORETC.MAN )MM, CHANNEL SECTION A -A
1 \ \ a A I INSTAL N CANLES (E.G.(a[ED/ APPROVEDNBI ME S,ORWA ER a ♦ Scum. uMEss oraRWn
0.57 \ pnu,r.
2\ __ 1 _ L nSCOPE -001LIEN
F. ,nE RORRR SXNLL CI WATERED RO WIRYMCD AT ALL ]' COHC PW - 0.015
L_ -- YR WRING CAISiRVCIION ACIIYTIES SO As r0 RCYFNT WIND-
- - BAY aN
%• I -- CAUSEDERDSIGH. ALL LAND DISTURONGACMES :HALLBE CHANNEL SECTION B-B
_- K ,� / EOIATELY DI VONDI U[D WHEN FUGITIVE DUST IMPACTS ADJACENT 41W - 079'
!/ - �� a G-11 / EIn901GMEEERING o[PO EN1m By THE CITY or Ton cauxs IRE . LI• .IW . a.w roe
FF ow r N B F. LL TEYPORYM1 (S, MUL) EROSION CONTROL MEASURE • O.M
49 6D ., \ /1}/.HjRL� /��/J� SHALL N INSPECTED WO REPAIRED OR RLCDHS1RVRR AS ON - 076 IN � 4CV[ - 2.OS
PA \ - G-12 hY (l 1 CEC�W AFTER EACH N D PRFORYANL[ Or LIU AUNOFF [WILL
INTENDED FOXRION ASSURER TO LL PH 9 2' MIN.
' e MAIMEDSEWRn. PARIWUO,Y THESE ON LAVED WO AY W W oro.W sm + DIED - aJl n:
KEY AN Min 1 SURFACES. SHAM BE REWOVED AND OPPOSED OF A A YAMMER AND ,Ep »OM - e,Go ETW - 0 JS'
- I LOCATION 50 AS MR TO CAUSE THEIR RELEASE INTO ANY vl W - 1,5, No
10.7Fr%- 1 "- MAIKAGEWAY.
D N
Q I 1 - •I 4.NO SOIL AD SOILSTOCKINUE SHAM SIOLKPIIES WM BLED TEN RWECRD FROM SEDIMENT0) FEET IN ,. 2' CWC. PAN
SPORT IT„RFACERWGHEXIXG.WATERING.ANDPERILER CHANNEL SECTION C-C
1. 1 I 1 SILT FENCING. SAL STOCKPILE MYNNAG AFTER 30 DAYS
4. ' H sxm BE MIND AND WmMED.
R 7M ? ~ -- _ _�J ELK I I I I I 1 M. CRY ORDINANCE PROMIBRS THE TRMKNG. MOPPING, OR AM 201/202
OF As 271 12G1.13 y1 I I MMSITIW OF SOIL OR ANY HICILACE OTRR MATERIAL ONTO CITY STREEM I A S 0 K D J r Y A Y J
A4 -D.' I G 1 I I I BY Oft SHAM BEOM ANY CLEM[DVIMMEDIATELY BY INADVERTENT
RCONTRACTORIILO MATERIAL 11 I
j n0.5% A I 1I
II I I 11I I !I I
T I ill
I
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e
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1 AM FIT As, Min\` V I ! 11
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Ine 6" curb (tyy) L
02 50 HeLIHD
1
�LIMON DRIVE--Gift'II
SUMMARY OF DRAINAGE DATA
DRAINAGE
BASINS
AREA
DEVELOPED
DEVELOPED
2-YR C
2-YIR 0
100-YR C
100-YR 0
A
0.14
OJO
0.28
0.88
1.23
B
0.11
0,57
0.18
0J1
0.78
C
0.24
0.54
0.37
0.68
1,62
D
073
0.79
1.64
0.98
7.12
E
009
0.48
0.12
0.60
0.54
F
0,23
0.46
0.30
0.58
1.33
G
a32
0.45
0.41
0.56
1.78
H
0.21
am
0.33
0.69
1.44
1
0.23
0.55
0.3E
069
1.58
J
0.27
0.48
37
0.80
1.61
K
0.65
071
1,32
0.89
5.76
_--LEGENDwei
loy my my wer my low my my my my wer Ds[D eANB BWHOARv
QAt Nobel HAVE
PROPOSED BASIN LABELWWASN
0.55 WWASN AREA
QROPGSm DESIGN PANT
PROPOSED FLOW WOODEN
ROPoSEO RR WLYEMT wM FES
ON
x® x RQ SILT I�VEHICLE TEACHING CONTROL
® TP MEET MZCw (RAM£L FLTRI
�N® STRAW BAI BMRIR
PROPOSED 2' SDEWAUJK CHASE
O2 PROPOSED 2* CURB CUT
03 PROPOSED 4' PVC DOWNSPOUT CHASE
OVCRDr GRAVING
WIND EROSION CONTROL
S"I gnenll
Perim.< Balmer
Barren
mili Method,
Sao Somali
Other
PAMFALL EROSION
CONTROL TRUCTURAL-
S,bl ,.l T p/li
Fliters
Sir I no IBarrlen
Sand Lao
It...S
o.e P nPonllon
C, Ian. FaMaa
Yhm at/C... re Paying
a .nl Sol voning
Ma Somali/ $eam
Te Wa0SAM PWning
IN
Olne691/ Mua / Banble
MOT[ ION EROSION CA ATTRACTS. ME
EROSION CONTROL 0[M1L SHEET,
GRAPHIC SCALE
5 TO NO 1M
s mOe - W ,L
City of
ForF Comm. Colombo
UTILITY
PLAN APPROVAL
APPROVED:
CRY Engineer
Dale
CHECKED
BY:
W»v a VbMmim, MINT
We
CHECKED
BY.
Mlam..ater UNITY
Go,
CHECKED
BY.
PINS a Monalon
WB
CHECKED
BY
irINA L191",
Data
CHECKED
BY
-
9
W
fn
>
N
W
Y
OIL,5
O
V
Ty
I
L2F.
A
yy4
U
C
Ly
P
GO
O
'TIC'
m
A
A O =
o
O
Go 0
�u ct
AT
K C U t
O O 'Q V2
d
O
W
FOR CONSTRUCTION DATE: DATE:7/25/Ol
11