HomeMy WebLinkAboutDrainage Reports - 12/07/1995FINAL
EROSION CONTROL REPORT
FOR
WOODLAND PARK ESTATES I TST, INC.
P.U.D.
SUBMITTED TOO
CITY OF FORT COLLINS
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TARANTO, STANTON & TAGGE
im Consulting Engineers
CLIENT
JOB NO. ,Q- / ✓9 "DQJ
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G050713-84
' Table 8-1 lists several gradations of riprap. The minimum average size designation for loose riprap 1 8
Tab
shall be 12 inches. Smaller sizes of riprap shall be either buried on slopes which can be easily
maintained (4 to t minimum side slopes) or grouted if slopes are steeper. Grouted riprap should meet
all the requirements for regular riprap except that the smallest rock fraction (smaller than the 10 per-
cent size) should be eliminated from the gradation. A reduction of riprap size by one size designation
' (from 18 inches to 12 inches or from 24 inches to 18 inches) is permitted for grouted riprap.
Table 8-1
i CLASSIFICATION AND GRADATION OF ORDINARY RIPRAP
% of Total Weight
Smallerthanthe Stone Size dsot
Riprap Designation Given Size (in pounds) Cinches)
70.100 85
Class 6 tt 50-70 35
35-50 10 6
' 2-10 <1
70=100 440
Class 12 50-70 275
35-50 85 12
2.10 3
100 1275
Class 18 50-70 655
35-50 275 18
2-10 10
100 3500
Class 24 50-70 1700
35-50 655 24
2-10 35
t dyo = Mean Particle Size. At least 5o percent of the mass shall be stones equal to or larger than this dimension.
tt Bury on 4 to 1 side slopes or grout rock if slopes are steeper.
Table 8-2 summarizes riprap requirements for a stable channel lining based on the following
relationship:
' VSO.v
'
o.ao = 5.8 . (dso) ' (Ss-1)
' in which, V = Mean channel velocity in feet per second
S = Longitudinal channel slope in feet per foot
Ss = Specific gravity of rock (minimum Ss= 2.50)
dso = Rock size in feet for which 50 percent of the riprap by weight is smaller.
The rock sizing requirements in Table 8-2 are based on the rock having a specific gravity of 2.5 or
I� more. Also, the rock size does not need to be increased for steeper channel side slopes, provided the
side slopes are no steeper than 2h:1v. Rock lined side slopes steeper than 2h:1v are not
I recommended.
1' Table 8-2
RIPRAP REQUIREMENTS FOR CHANNEL LININGS tt
VSo.t7f(S'_ 1)0.eet Rock Type tt
0 to 1.4 No Riprap Required
1.5 to 4.0 Class 6 Riprap
4.1 to 5.8 Class 12 Riprap
5.9 to 7.1 Class 18 Riprap
7.2 to 8.2 Class 24 Riprap
t Use S, = 2.5 unless the source of rock and its densities are known at the time of design.
11 Table valid only for Froude number of 0.8 or less and side slopes no steeper than 2h:1v.
I'
MAY 1984 8-2 f DESIGN CRITERIA
�,
The thickness of the riprap layer should be at least 1.75 times dso (at least 2.0 times dso in sandy soils)
and should extend up the side slopes at least one foot above the design water surface. At the upstream
'
and downstream termination of a riprap lining; the thickness should be increased 50 percent for at least
3 feet to prevent undercutting. Where only the channel sides are to be lined, the riprap blanket should
extend at least three feet below the existing channel bed and the thickness of the riprap layer
underneath the channel bed increased to at least three times dso to prevent under cutting.
Riprap should be placed on either filter material (gravel bedding), a plastic filter cloth, or a combination
'
of both to protect channel embankment materials from washing out through the riprap. Generalized
filter material specifications are listed in Tables 8-3 and 8.4. The Type I filter in Table 8-3 is designed to
be the lower layer in a two layer filter for protecting fine grained soils and has a gradation identical to
Colorado Division of Highways concrete sand specification AASHTO M 6 (Section 703.01). The Type
11 filter, the upper layer in a two layer filter, is equivalent to Colorado Division of Highways Class A filter
material (Section 703.09) except that it permits a slightly larger maximum rock fraction.
For fine grained soils either a two layer filter (Type I topped by Type 11), or a single 12-inch layer of Type
II filter is required. For coarse sand and gravel (50% or more by weight retained on the #40 sieve), only
the Type II filter is required. Filter cloth is not a complete substitute for filter material. Recommenda-
tions for its use are made in the Urban Storm Drainage Criterial Manual.
Table 8-3
GRADATION FOR FILTER MATERIAL
% by Weight passing Square Mesh Sieves
Types Type 11
(CDOH concrete sand specification (COON Class A,
Sieve Size (AASHTO M6) Section 703.01) Section 703.09)
3^ 90-100
1.112" ... ...
�l
3/4' ... 20-90
318" 100 ...
#4 95-100 0.20
'
# 16 45-80
#50 10-30
'
#100 2-10 ..•
# 200 0-2 0-3
Table 8-4
THICKNESS REQUIREMENTS FOR FILTER MATERIAL
Minimum Thickness (Inches)
Fine Grained Soils t Course Grained Soils tt
Riprap Designation Type 1 Type 11 Type 11
Gabions, slope mattresses,
Class 6 and Class 12 riprap................................... 4 4 6
'
Class 18 and Class 24 riprap................................. 4 6 8
t May substitute one 12 inch layer of Type II bedding.
tt Fifty percent or more by weight retained on the #40 sieve.
_
1'
MAY 1984 8.3 DESIGN CRITERIA
I
I
1
1
TABLE 8
RAINFALL PERFORMANCE STANDARD EVALUATION
Project: Woodland Park P.U.D. Standard Form A
Sequence For 1995 Only
Completed By: KGS Date: August 11, 1995
DEVELOPED
ERODIBILITY
Asb (ac)
I Lsb (ft)
Ssb (%)
Lb (ft)
Sb
PS (%)
SUB -BASIN
ZONE
M
Al
Moderate
3.33
970
0.82
A2
Moderate
1.77
950
0.84
A3
Moderate
2.45
590
0.34
A4
Moderate
1.26
210
0.71
A5
Moderate
0.23
150
1.23
A6
Moderate
0.59
365
1.23
A7
Moderate
3.64
1,200
1.00
A8
Moderate
2.00
185
1.00
TOTAL
760.28
0.82
75.5 (88.82)
B 1
Moderate
1.90
990
1.00
B2
Moderate
2.57
1,300
1.28
B3
Moderate
3.86
1,100
1.23
B4
Moderate
2.89
920
1.28
B5
Moderate
4.06
950
1.23
B6
Moderate
0.85
275
1.23
TOTAL
1,005.43
1.22
78.8 (92.71)
Cl
Moderate
4.63
1,050
0.70 .
TOTAL
1,050
0.70
73.2 (86.12)
D1
Moderate
11.14
800
3.30
TOTAL
800
3.30
82.5 (97.06)
E1
Moderate
8.00
500
5.00
E2
Moderate
5.00
500
1.00
TOTAL I
I
1
1 500 1
3.46
82.7 (97.29)
TABLE 9. EFFECTIVENESS CALCULATIONS
I
11
I
l_1
1
PROJECT: WOODLAND PARK P.U.D. STANDARD FORM B
COMPLETE BY: KG.S. DATE: AUG. 14, 1995
EROSION CONTROL METHOD C-FACTOR P-FACTOR COMMENT
BARE GROUND 1.00 0.90 ROUGHENED
RAVEL LNL.ET FILTER 1.00 0.80
PAVEMENT 0.01 1.00
STABLISHED VEGETATION 0.03 1.00
EED & MULCH 0.06 1.00
MAJOR
SUB
PS
AREA
CALCULATIONS
BASIN
BASIN
(%)
(AC)
A
Al
75.5
3.33
75%RESEED/MULCH
(88.82)
25% BARE GROUND
INLET FILTER
WT. C-FACTOR= 0.30 (0.01)
WT. P-FACTOR = 0.78 (1.00)
EFF. = 77% (99%)
A2
75.5
1.77
75% RESEED/MULCH
(88.82)
25% BARE GROUND
INLET FILTER
WT. C-FACTOR = 0.30 (0.01)
WT. P-FACTOR = 0.78 (1.00)
EFF. = 77.0% (99%)
A3
75.5
2.45
70% RESEED/MULCH
(88.82)
30% BARE GROUND
INLET FILTER
WT. C-FACTOR = 0.34 (0.01)
WT. P-FACTOR = 0.78 (1.00)
EFF. = 74% (99%)
A4
75.5
1.26
80% RESEED & MULCH
(88.82)
20% BARE GROUND
INLET FILTER
WT. C-FACTOR = 0.25 (0.01)
WT. P-FACTOR = 0.78 (1.00)
EFF. = 80% (99%)
TST Inc.
Consulting () Values in parenthesis
Engineers are Post Construction
TABLE 9. EFFECTIVENESS CALCULATIONS
I
I
I
i
i
A5
75.5
0.23
70% RESEED & MULCH
(88.82)
30% BARE GROUND
INLET FILTER
WT. C-FACTOR = 0.34 (0.01)
WT. P-FACTOR = 0.78 (1.00)
EFF. =74% (99%)
A6
75.5
0.59
70% RESEED & MULCH
(88.82)
30% BARE GROUND
INLET FILTER
WT. C-FACTOR = 0.34 (0.01)
WT. P-FACTOR = 0.78 (1.00)
EFF. = 74% (99%)
A7
75.5
3.64
100% RESEED & MULCH
(88.82)
WT. C-FACTOR = 0.06 (0.06)
WT. P-FACTOR = 1.00 (1.00)
EFF. = 94.0% (99%)
A8
75.5
2.00
100% RESEED & MULCH
(88.82)
WT. C-FACTOR = 0.06 (0.01)
WT. P-FACTOR= 1.00 (1.00)
EFF. = 94% (990/,)
A
75.5
15.27
AREA WT. EFF. = 82.9%> 75.5%; (99%)> (88.82%)
(88.82)
B
B 1
78.8
1.90
100% RESEED & MULCH
(92.71)
WT. C-FACTOR = 0.06 (0.06)
WT. P-FACTOR = 1.00 (1.00)
EFF. = 94.0% (99%)
B2
78.8
2.57
70% RESEED & MULCH
(92.71)
30% BARE GROUND
INLET FILTER
WT. C-FACTOR = 0.34 (0.01)
WT. P-FACTOR = 0.78 (1.00)
EFF. = 74% (99%)
TST Inc.
Consulting
Engineers
( ),Values in parenthesis
are Post Construction
TABLE 9. EFFECTIVENESS CALCULATIONS
I
1
I
1
I
B3
78.8
3.86
80% RESEED & MULCH
(92.71)
20% BARE GROUND
INLET FILTER
WT. C-FACTOR = 0.25 (0.06)
WT. P-FACTOR = 0.78 (1.00)
EFF. = 80% (99%)
B4
78.8
2.89
80% RESEED & MULCH
(92.71)
20% BARE GROUND
INLET FILTER
WT. C-FACTOR = 0.25 (0.06)
WT. P-FACTOR = 0.78 (1.00)
EFF. = 80% (99%)
B5
(92.71)
4.06
80% RESEED & MULCH
(90.6)
20% BARE GROUND
INLET FILTER
WT. C-FACTOR = 0.25 (0.01)
WT. P-FACTOR = 0.78 (1.00)
EFF. = 74% (99%)
B6
78.8
0.85
50% RESEED & MULCH
(92.71)
50% BARE GROUND
INLET FILTER
WT. C-FACTOR = 0.53 (0.06)
WT. P-FACTOR = 0.76 (1.00)
EFF. = 60% (99%)
B
78.8
16.13
AREA WT. EFF. = 79.6%> 78.8; (99%) > (92.71%)
(92.71)
C
Cl
73.2
4.63
100% RESEED & ESTABLISHED VEG.
(86.12)
WT. C-FACTOR = 0.06 (0.02)
WT. P-FACTOR = 1.00 (1.00)
EFF. = 94% (98%)
C
73.2
4.63
AREA WT. EFF. = 94%> 73.2%; (98%)> (86.12%)
(86.12)
' TST Inc.
Consulting () Values in parenthesis
Engineers are Post Construction
TABLE 9. EFFECTIVENESS CALCULATIONS
S
I
I
I.7
D
DI
82.5
11.14
100% RESEED & ESTABLISHED VEG.
(97.06)
WT. C-FACTOR = 0.06 (0.02)
WT. P-FACTOR =1.00 (1.00)
EFF. = 94.0% (98%)
D
82.5
11.14
AREA W. EFF. = 94%> 82.5%; (98%) > (97.06%)
(97.06)
E
El
82.7
8.00
100% ESTABLISHED VEGETATION
(97.29)
WT. C-FACTOR = 0.025 (0.025)
WT. P-FACTOR =1.00 (1.00)
EFF. = 97.5% (97.5%)
E2
82.7
5.00
100% ESTABLISHED VEGETATION
(97.29)
WT. C-FACTOR = 0.025 (0.025)
WT. P-FACTOR =1.00 (1.00)
EFF. = 97.5% (97.5%)
E
82.7
13.00
AREA WT. EFF. = 97.5%> 82.7%; (97.5%)> (97.29%)
(97.29)
TST Inc.
Consulting
Engineers
() Values in parenthesis
are Post Construction
II
TABLE 10
CONSTRUCTION SEQUENCE
Project: Woodland Park P.U.D. Standard Form C
Sequence For 1995 Only
Completed By: KGS Date: August 11, 1995
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
1995
MONTH
:5kr pi-
OG"i.
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
As t eGESSAey
Straw Barriers
Silt Fence Barriers
s YIECEssaey
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
Structures: Installed by: Contractor
Date Submitted: . it ms
Maintained by: Owner
Approved by City of Fort Collins on:
1
1
1
1
1
1
1
1
1
1
1
1
1
i
1
1
i
TST, INC.
Consulting Engineers CONCEPTUAL OPINION OF COST
Client:
CHATEAU CUSTOM BUILDERS INC
Job No 10-788-001
;pate 8%11/95
Project
...................OLAND PARK P U D :
By KGS
No `
Item
Quantity''
Units
Unit Cost
Total;
Comments .. !.
EROSION CONTROL
1
Reseed/Mulch
36.35
AC.
$650.00
$23,627.50
$0.0149/S.F.
2
Inlet Filter
6
EA.
$400.00
$2,400.00
3
Silt Fence
1,594
L.F.
$3.00
$4,782.00
4
Construction Cost
$30,809.50
1.5 x Cost
$46,214.25
Total Security
$46,214.25
1
City Reseeding Cost
36.35
AC.
$500.94
$18,209.17
$0.0115/S.F.
1.5 x Cost
$27,313.75
Total Security
$27,313.75
Security to be Used
$46,214.25
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