HomeMy WebLinkAboutdrainage reportDrainage Report
for
Meadowcreek Subdivision
Phase 4
Brazos County, Texas
July, 2009
Developer:
Main Street Homes - CS, Ltd.
900 Congress Avenue, Suite L-100
Austin, Texas 78701
(512) 801-8832
Prepared By:
Civil Development, Ltd.
2033 Harvey Mitchell Parkway South
College Station, Texas 77840
(979) 764-7743
09V
3'~~'c(/
Drainage Report - Executive Summary
Meadow Creek Subdivision, Phase 4
Brazos County, Texas
June 17, 2009
ENGINEER
Civil Development, Ltd. - Ginger Urso, P.E. (ginger@cdlbcs.com)
P.O. Box 11929
College Station, Texas 77842
Phone: (979) 764-7743 Fax: (979) 764-7759
OWNER/DEVELOPER
Main Street Homes - CS, Ltd.
900 Congress Avenue, Suite L-100
Austin, Texas 78701
(512) 801-8832
GENERAL DESCRIPTION AND LOCATION
This project consists of the development of Phase 4 of the Meadow Creek Subdivision in Brazos County.
Phase 4 is a single-family residential development, which will include the construction of utilities and
infrastructure.
Phase 4 is located to the south of Phase 2 of the Meadow Creek development. The development is located
west of FM 2154 along the south side of Koppe Bridge Road approximately 1 mile from Wellborn, Texas
Area: 20.566 acres
Existing Land Use: Vacant
Proposed Land Use: Single-Family Residential
Number of Lots: 88 residential
Drainage Basin: Peach Creek Drainage Basin
FEMA FIRM: #48041 C0200-C, dated July 2, 1992
Floodplain: None of this phase of the development lies within the floodplain.
HYDROLOGIC CHARACTERISTICS
The existing site was cleared in 2005. The elevations range from 306 to 325, sloping in generally southerly
direction, where runoff leaves the site in an existing drainage channel. Ultimately, this runoff flows into
a tributary of Peach Creek and then into Peach Creek.
GENERAL STORMWATER PLAN
The drainage plan for this development will involve the installation of additional pipes, inlets & junction
boxes, which will collect and transmit the runoff into Detention Ponds 2A & 2B. The runoff that is collected
by these detention ponds will be discharged into a tributary of Peach Creek, which will flow into Peach
Creek.
COORDINATION & STORMWATER PERMITTING
The project will require that a Notice of Intent be submitted to the Texas Commission for Environmental
Quality. No other permits are anticipated for this project.
The following items comprise this drainage report for this project:
Executive Summary
Appendix A - Drainage Area Calculations
Appendix B - Depth of Flow in Gutter
Appendix C - Storm CAD Pipe & Inlet Analysis
Appendix D - Drainage Area Map (Exhibit A)
Page 1 of 1
APPENDIX A
Drainage Area Calculations
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APPENDIX B
Depth of Flow in Gutter Calculations
Meadowcreek Subdivision
Phase 4
Depth of Flow in Gutter
(Rafar M Fxhihit A fnr Guitar I ncatinnsl
10-year storm
100-year storm
Gutter
A
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Slope
tc
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Location
Area #
(acres)
(ft/ft)
(min)
(in/hr)
(cfs)
(ft)
(in)
(In/hr)
(cfs)
(ft)
(in)
Al
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1.55
0.55
0.0150
20.9
6.064
5.17
0.301
3.61
8.238
7.02
0.338
4.05
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1.37
0.55
0.0150
18.5
6.471
4.88
0.294
3.53
8.776
6.61
0.330
3.96
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2
1.72
0.55
0.0100
22.5
5.823
5.51
0.333
3.99
7.920
7.49
0.373
4.48
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3
1.53
0.55
0.0100
19.2
6.346
5.34
0.329
3.95
8.611
7.25
0.369
4.42
B1
2A+3A
1.01
0.55
0.0080
10
8.635
4.80
0.329
3.95
11.639
6.47
0.368
4.42
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19
0.14
0.55
0.0080
10
8.635
0.66
0.157
1.88
11.639
0.90
0.176
2.11
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0.11
0.55
0.0124
10
8.635
0.52
0.132
1.58
11.639
0.70
0.148
1.77
B4
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0.15
0.55
0.0124
10
8.635
0.71
0.148
1.78
11.639
0.96
0.166
1.99
Cl
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1.45
0.55
0.0080
22.6
5.809
4.63
0.325
3.90
7.901
6.30
0.365
4.38
C2
5
1.26
0.55
0.0200
11.9
8.014
5.55
0.293
3.52
10.817
7.50
0.328
3.93
C3
4
2.09
0.55
0.0200
24.6
5.539
6.37
0.308
3.70
7.544
8.67
0.346
4.16
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5A
1.21
0.55
0.0100
13.8
7.487
4.98
0.320
3.84
10.120
6.74
0.359
4.30
C5
4A
0.50
0.55
0.0100
10
8.635
2.37
0.243
2.91
11.639
3.20
0.271
3.26
C6
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0.39
0.55
0.0080
10
8.635
1.85
0.230
2.77
11.639
2.50
0.258
3.09
C7
11
0.92
0.55
0.0080
10
8.635
4.37
0.318
3.82
11.639
5.89
0.356
4.27
C8
12
0.96
0.55
0.0080
10
8.635
4.56
0.323
3.88
11.639
6.15
0.361
4.34
C9
13
0.19
0.55
0.0080
10
8.635
0.90
0.176
2.11
11.639
1.22
0.197
2.36
C10
14
0.15
0.55
0.0080
10
8.635
0.71
0.161
1.93
11.639
0.96
0.180
2.16
C11
15
0.49
0.55
0.0080
10
8.635
2.33
0.251
3.01
11.639
3.14
0.281
3.37
C12
16
0.34
0.55
0.0080
10
8.635
1.61
0.219
2.63
11.639
2.18
0.245
2.94
C13
17
0.34
0.55
0.0080
10
8.635
1.61
0.219
2.63
11.639
2.18
0.245
2.94
C14
18
0.28
0.55
0.0080
10
8.635
1.33
0.204
2.44
11.639
1.79
0.228
2.73
C15
6
1.15
0.55
0.0100
13.8
7.487
4.74
0.314
3.77
10.120
6.40
0.352
4.22
C16
6A
0.93
0.55
0.0080
14.3
7.362
3.77
0.301
3.61
9.954
5.09
0.337
4.04
C17
<11
0.61
0.55
0.0080
10
8.635
2.90
0.273
3.27
11.639
3.90
0.305
3.66
D1
7
0.54
0.55
0.0300
10
8.635
2.56
0.203
2.44
11.639
3.46
0.227
2.73
D2
9
0.07
0.55
0.0300
10
8.635
0.33
0.094
1.13
11.639
0.45
0.106
1.27
D3
8
1.26
0.55
0.0200
27.1
5.240
3.63
0.250
3.00
7.148
4.95
0.281
3.37
D4
10
0.04
0.55
0.0200
10
8.635
0.19
0.083
0.99
11.639
0.26
0.092
1.11
Transverse (Crown) slope (ft/ft)
27' street = 0.0300
Stralaht Crown Flow (Solved to find actual depth of flow in cutter, v):
Q = 0.56 * (z/n) * S"2 * y°" b y = {Q / [0.56 * (z/n) * sl/21)3/8
n = Roughness Coefficient = 0.018
S = Street/Gutter Slope (ft/ft)
y = Depth of flow at inlet (ft)
z = Reciprocal of crown slope:
27' street = 33
APPENDIX C
Storm CAD Pipe & Inlet Analysis
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APPENDIX D
Post Development Drainage Area Map
(Exhibit A)
~ ~ 1 I O
,z A = .-•1
I N / `.iwe.
I J o
2.09 N s
1.45: I~i : I - m of
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LEGEND w O U
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SCALE IN FEET
- sr- sr-
PROPOSED STORM SEWER
m
STORM INLET
DRAINAGE AREA BOUNDARY
TIME OF CONCENTRATION
CALCULATION FLAW PATH
- - - -
PROPERTY UNE
2~B
0.13
DRAINAGE AREA NUMBER &
ACREAGE
C15
GUTTER DEPTH CHECK LOCATION
Li a O
0
Q
w
EXHIBfr
A
Meadowcreek Subdivision Phase 4A
Engineer's Estimate
April 14, 2009
Item
No.
Description
Estimated '
Unit
Quantity
Unit Price
Estimated Cost
Streets & Sitework
1
Mobilization/Construction Staking
1 LS
15,000.00
15,000.00
2
Excavation/Grading (est. 3200 cy cut)
1 LS
16,000.00
16,000.00
3
Mixing & Compaction of Lime Stabilized Subgrade (6" depth)
6,712 SY
2.10
14,095.20
4
Hydrated Lime (27 lb/sy)
91 TN
160.00
14,560.00
5
Base Material - 8" depth
708 Sy
12.00
8,496.00
6
Base Material - 6" depth
4,216
SY
8.50
35,836.00
7
Asphalt Paving - 2" depth
4,924
SY
11.75
57,857.00
8
Concrete Curb and Gutter (all types)
3,322
LF
11.00
36,542.00
9
Trunkated Dome Pavers in HC Ramps
135
SF
15.00
2,025.00
10
Sidewalk - 4" depth
7,020
SF
3.25
22,815.00
11
Concrete Apron - 6" depth
2,266
SF
5.50
12,463.00
12
End of Road Signs
4
EA
125.00
500.00
13 1
Hydromulch Seeding (curb to ROW, excluding SW)
10,807
SY
0.60
6,484.20
Subtotal - Streets & Sitework 242,673.40
Storm Drainage
14
Detention Pond Excavation (est. 31000 cy cut)
1
LS
124,000.00
124,000.00
15
18" HDPE Pipe, structural backfill
34
LF
45.00
1,530.00
16
24" HDPE Pipe, structural backfill
54
LF
55.00
2,970.00
17
24" HDPE Pipe, non-structural backfill
316
LF
48.00
15,168.00
18
10' Recessed Inlet
2
EA
3,200.00
6,400.00
19
Standard Junction Box
1
EA
2,500.00
2,500.00
20
Connect to existing inlet
1
EA
1,500.00
1,500.00
21
Raise berm on Pond 1
1
EA
5,000.00
5,000.00
22
Pond 2A Outlet Pipe Modification
2
EA
1,000.00
2,000.00
23
Pond 2B Concrete HW w/dissipator blocks
1
EA
3,000.00
!3,000.00
24
Pond 2B Outlet Structure w/trash rack
1 EA
2,500.00
2,500.00
25
Inlet Protection
3 EA
100.00
300.00
26
Construction Exit
1 EA
1,800.00
1,800.00
27
Rock Rip Rap
191 SY
45.00
8,595.00
28
Silt Fence
3,430 LF
3.25
11,147.50
29
TV Inspection (storm sewer)
608 LF
4.001
2,432.00
Subtotal - Storm Drainage 190,842.50
Page 1 of 2
Meadowcreek Subdivision Phase 4A
Engineer's Estimate
April 14, 2009
Item
Description
Estimated
Unit
Unit Price
Estimated Cost
No.
Quantity
Water
30
6" Water PVC CL200 (C909) - non-structural backfill
960
LF
20.00 19,200.00
31
8" Water PVC CL200 (C909) - structural backfill
141
LF
27.00 3,807.00
32
8" Water PVC CL200 (C909) - non-structural backfill
726
LF
22.00! 15,972.00
33
Fire Hydrant Assembly (incl. 6"x6" tee, valve, bend & hydrant)
1
EA
2,900.00 2,900.00
34
8" M.J. Gate Valve
4
EA
950.00, 3,800.00
35
6" M.J. Gate Valve
3
EA
750.00
2,250.00
36
8"x 8" M.J. Tee
1
EA
450.00
450.00
37
8"x 6" M.J. Tee
2
EA
450.00
900.00
38
6"x 6" M.J. Tee (cut in to existing 6" line)
1
EA
750.00
750.00
39
8"x 6" M.J. Reducer
1
EA
350.00
350.00
40 '
8"x 22.5° M.J. Bend
8
EA
350.00
2,800.00
41
2" Blow Off Assembly
2
EA
900.00
1,800.00
42
Connect to existing water line
1
EA
500.00
500.00
43
12" PVC Sleeve
108
LF
25.00
2,700.00
44
1" Water Service, <15 ft (avg length = 1 ft)
1
EA
450.00
450.00
45
1" Water Service, > 15 ft (avg length = 58 ft), w/4"x30' sleeve
5
EA
1,500.00
7,500.00
46
1.5" Water Service, < 15 ft (avg length = 1 ft)
9
EA
700.00
6,300.00
47
1.5" Water Service, > 15 ft (avg length = 58 ft), w/4"x30' sleeve
14
EA
1,700.00
23,800.00
Subtotal - Water 96,229.00
Sewer
48
6Sewer SDR 26 D-3034 - structural backfill
87
LF
35.00
3,045.00
49
6" Sewer SDR 26 D-3034 - non-structural backfill
1,745
LF
22.00
38,390.00
50
6" Sewer SDR 26 D-2241 - structural backfill
10
LF
37.00
370.00
51
6" Sewer SDR 26 D-2241 - non-structural backfill
30
LF
25.00
750.00
52
8" Sewer SDR 26 D-3034 - structural backfill
51
LF
38.00
1,938.00
53
8" Sewer SDR 26 D-3034 - non-structural backfill
2,143
LF
24.00
51,432.00
54
8" Sewer SDR 26 D-2241 - non-structural backfill
40
LF
26.00
1,040.00
55
4' Manholes - 0'- 8.00' Depth
2
EA
2,500.00
5,000.00
56
4' Manholes - 8.0l'- 10.00' Depth
5
EA
2,800.00
14,000.00
57
4' Manholes - 10.0l'- 12.00' Depth
5
EA
3,300.00
16,500.00
58
4" Sewer Service, < 15 ft (avg length = 1 ft)
13 EA
450.001 5,850.00
59
4" Sewer Service, > 15 ft (avg length = 58 ft)
11 EA
1,300.00i 14,300.00
60
4" Sewer Service Tap w/stack (for future service)
45 EA
450.001 20,250.00
61
TV Inspection (sanitary sewer)
4,106 LF
3.50 14,371.00
Of T`\~ 1
* ~ «1/
85623
r
4 9/, y10q
Page 2 of 2
Subtotal - Sewer 187,236.00
TOTAL CONSTRUCTION $716,980.90
Drainage Report
for
Meadowereek Subdivision
Phase 4
Brazos County, Texas
November, 2008
Developer:
Main Street Homes - CS, Ltd.
900 Congress Avenue, Suite L-100
Austin, Texas 78701
(512) 801-8832
Prepared Bv:
Civil Development, Ltd.
2033 Harvey Mitchell Parkway South
College Station, Texas 77840
(979) 764-7743
Drainage Report - Executive Summary
Meadow Creek Subdivision, Phase 4
Brazos County, Texas
November 14, 2008
ENGINEER
Civil Development, Ltd. - Ginger Urso, P.E. (ginger@cdlbcs.com)
P.O. Box 11929
College Station, Texas 77842
Phone: (979) 764-7743 Fax: (979) 764-7759
OWNER/DEVELOPER
Main Street Homes - CS, Ltd.
900 Congress Avenue, Suite L-100
Austin, Texas 78701
(512) 801-8832
.
!ne etl1
GINGZR ~".j "Iso
••00O @Ib O:~•_~pCG bd••O
{ •
~AL
GENERAL DESCRIPTION AND LOCATION
This project consists of the development of Phase 4 of the Meadow Creek Subdivision in Brazos County.
Phase 4 is a single-family residential development, which will include the construction of utilities and
infrastructure.
Phase 4 is located to the south of Phase 2 of the Meadow Creek development. The development is located
west of FM 2154 along the south side of Koppe Bridge Road approximately 1 mile from Wellborn, Texas
Area: 20.566 acres
Existing Land Use: Vacant
Proposed Land Use: Single-Family Residential
Number of Lots: 88 residential
Drainage Basin: Peach Creek Drainage Basin
FEMA FIRM: #48041 C0200-C, dated July 2, 1992
Floodplain: None of this phase of the development lies within the floodplain.
HYDROLOGIC CHARACTERISTICS
The existing site was cleared in 2005. The elevations range from 306 to 325, sloping in generally southerly
direction, where runoff leaves the site in an existing drainage channel. Ultimately, this runoff flows into
a tributary of Peach Creek and then into Peach Creek.
GENERAL STORMWATER PLAN
The drainage plan for this development will involve the installation additional pipes, inlets & junction boxes,
which will collect and transmit the runoff into Detention Ponds 2A & 2B. The runoff that is collected by
these detention ponds will be discharged into a tributary of Peach Creek, which will flow into Peach Creek.
COORDINATION & STORMWATER PERMITTING
The project will require that a Notice of Intent be submitted to the Texas Commission for Environmental
Quality. No other permits are anticipated for this project.
The following items comprise this drainage report for this project:
Executive Summary
Appendix A - Drainage Area Calculations
Appendix B - Depth of Flow in Gutter
Appendix C - Storm CAD Pipe & Inlet Analysis
Appendix D - Drainage Area Map (Exhibit A)
Page 1 of I
APPENDIX A
Drainage Area Calculations
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APPENDIX B
Depth of Flow in Gutter Calculations
Meadowcreek Subdivision
Phase 4
Depth of Flow in Gutter
/Rafor to Fvhihit A fnr rli ittar I ncatinncl
10-year storm
100-year storm
Gutter
A
Slope
tc
110
Q+o
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Q+oo
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Location
Area #
(acres)
C
(Wit)
(min)
(in/hr)
(cis)
(ft)
(in)
(in/hr)
(cfs)
(ft)
(in)
Al
<2
1.55
0.55
0.0150
20.9
6.064
5.17
0.301
3.61
8.238
7.02
0.338
4.05
A2
<3
1.37
0.55
0.0150
18.5
6.471
4.88
0.294
3.53
8.776
6.61
0.330
3.96
A3
2
1.72
0.55
0.0100
22.5
5.823
5.51
0.333
3.99
7.920
7.49
0.373
4.48
A4
3
1.53
0.55
0.0100
19.2
6.346
5.34
0.329
3.95
8.611
7.25
0.369
4.42
B1
2A+3A
1.01
0.55
0.0080
10
8.635
4.80
0.329
3.95
11.639
6.47
0.368
4.42
B2
19
0.14
0.55
0.0080
10
8.635
0.66
0.157
1.88
11.639
0.90
0.176
2.11
B3
<6A
0.11
0.55
0.0124
10
8.635
0.52
0.132
1.58
11.639
0.70
0.148
1.77
B4
<6A
0.15
0.55
0.0124
10
8.635
0.71
0.148
1.78
11.639
0.96
0.166
1.99
C1
<4
1.45
0.55
0.0080
22.6
5.809
4.63
0.325
3.90
7.901
6.30
0.365
4.38
C2
5
1.26
0.55
0.0200
11.9
8.014
5.55
0.293
3.52
10.817
7.50
0.328
3.93
C3
4
2.09
0.55
0.0200
24.6
5.539
6.37
0.308
3.70
7.544
8.67
0.346
4.16
C4
5A
1.21
0.55
0.0100
13.8
7.487
4.98
0.320
3.84
10120
6.74
0.359
4.30
C5
4A
0.50
0.55
0.0100
10
8.635
2.37
0.243
2.91
11.639
3.20
0.271
3.26
C6
<12
0.39
0.55
0.0080
10
8.635
1.85
0.230
2.77
11.639
2.50
0.258
3.09
C15
6
1.15
0.55
0.0100
13.8
7.487
4.74
0.314
3.77
10.120
6.40
0.352
4.22
C16
6A
0.93
0.55
0.0080
14.3
7.362
3.77
0.301
3.61
9.954
5.09
0.337
4.04
C17
<11
0.61
0.55
0.0080
10
8.635
2.90
0.273
3.27
11.639
3.90
0.305
3.66
D1
7
0.54
0.55
0.0300
10
8.635
2.56
0.203
2.44
11.639
3.46
0.227
2.73
D2
9
0.07
0.55
0.0300
10
8.635
0.33
0.094
1.13
11.639
0.45
0.106
1.27
D3
8
1.26
0.55
0.0200
27.1
5.240
3.63
0.250
3.00
7.148
4.95
0.281
3.37
D4
10
0.04
0.55
0.0200
10
8.635
0.19
0.083
0.99
11.639
0.26
0.092
1.11
Transverse (Crown) slope (ft/ft)
27' street = 0.0300
Straight Crown Flow (Solved to find actual depth of flow in gutter, v):
Q = 0.56 * (z/n) * S" * y6/3 y = (Q / 10.56 * (z/n) * S.+/2VIS
n = Roughness Coefficient = 0.018
S = Street/Gutter Slope (ft/ft)
y = Depth of flow at inlet (ft)
z = Reciprocal of crown slope:
27' street = 33
APPENDIX C
Storm CAD Pipe & Inlet Analysis
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APPENDIX D
Post Development Drainage Area Map
(Exhibit A)