HomeMy WebLinkAbout02-00500153- 00074484Design Report
Proposed Sanitary Sewer Line Improvements
for
Castlegate Subdivision - Section 10
College Station, Texas
August 2002
Prepared By:
TEXCON General Contractors
1707 Graham Road
College Station, Texas 77845
(979) 690-7711
i~~~ OF~~• 7,14
.
l!......
JOSEPH .SCMULTZ
.
ytl0 9~6 SS 9 : ~s
c '
F•
ss t
1.0 INTRODUCTION & DESCRIPTION
The purpose of this report is to provide a description of the proposed sanitary sewer to be
constructed with the Castlegate Subdivision - Section 10, and to provide the criteria used
in the design of this sanitary sewer system. The project will include the construction of
approximately 3,008 feet of sanitary sewer line. The line will service the proposed
development of the Castlegate Subdivision, Section 10, and the future development of
Castlegate Sections 11, 12 and 13.
2.0 SANITARY SEWER - Design Flow and Pipe Size Calculations
The proposed sewer line is to be constructed of 6"and 8" diameter SDR-26, PVC pipe
which meets the requirements of ASTM-D3034. The proposed manholes are 4' diameter
manholes, and vary from 7' to 16' in depth, with sewer line slopes ranging from 0.4% to
2.0%. The maximum distance between manholes is less than 500 feet, as required by the
Texas Natural Conservation Commission (TNRCC). The minimum allowable slopes for
8" and 6" pipes per TNRCC requirements are 0.33% and 0.50% respectively. All
construction shall meet the current City of College Station Standard Specifications for
Sanitary Sewer Construction. The sewer line information is summarized in Table 1.
3.0 DETERMINATION OF PEAK FLOW VALUES
The peak flows were based on using a daily use of 300 gallons per day for each dwelling
unit. The design peak flow is determined by multiplying the average daily flow by 1.5,
which results in the adjusted daily flow. This value is then multiplied by 3.0 to determine
the peak hourly flow. The velocities for the lines were calculated using Manning's
Equation. According to the TNRCC, the minimum velocity for sewer systems flowing full
is 2.0 feet per second. As shown in Table 1, the minimum anticipated flow velocities for
the proposed sewer lines at 50% full meet this requirement. The flow for 100% full will
not be less than the flow for 50% full; therefore, the TNRCC requirement is met. The
TNRCC requires that the maximum velocity for sewer systems flow full not exceed 10 feet
per second. The values in Table 1 are well below this maximum velocity.
TABLE 1 - SEWER LINE FLOW DATA
Manhole
No. of
Units From
Cumulative
Average
k Flow
P
Percent
50% Full
Z
N
Number
Size
Length
Slope
Dwelling Unit
Merging
Dwelling
Daily Flow
ea
Full
Flow
Velocity
c
J
From
To
(in)
(ft)
Services
Lines
units
(cfs)
(cfs)
(cfs)
(fps)
1006
1005
6
308.2
2.00
12
12
0.0056
0.0251
12.2
0.3968
4.0
Q
1005
1002
6
208.7
2.00
7
19
r3.96
0.0088
0.0397
15.2
0.3968
4.0
N
1002
V06
8
181.6
1.00
0
25(S10-2)
44
0.0204
0.0919
12.4
0.6042
3.5
1004
1003
6
101.3
0.60
2
2
0.42
0.0009
0.0042
6.9
0.2173
2.2
N
c
1003
1001
1002
1002
6
6
287.3
245.1
0.60
0.60
5
5
13
20
5
4.17
1.04
0.0093
0.0023
0.0418
0.0104
20.9
10.7
0.2173
0.2173
2.2
2.2
6
1007
6
241.4
1.90
12
12
2.50
0.0056
0.0251
12.3
0.3867
3.9
1
[t
1003
6
129.6
0.80
1
13
2.71
0.0060
0.0271
15.8
0.2509
2.6
1011
1010
6
217.3
1.10
8
8
1.67
0.0037
0.0167
11.6
0.2942
3.0
v
c
r
1010
1009
FVO
6
6
325.5
141.3
1.50
1.00
9
1
17
18
3.54
3.75
0.0079
0.0084
0.0355
0.0376
15.4
17.5
0.3436
0.2806
3.5
2.9
Future
V08
8
26.8
0.40
87
87
18.12
0.0404
0.1817
33.2
0.3821
2.2
V08
V07
8
180.9
0.40
0
18(S10-4)
11(future)
116
24.16
0.0538
0.2422
38.7
0.3821
2.2
N
j
V07
V06
8
327.4
0.40
0
116
24.16
0.0538
0.2422
38.7
0.3821
2.2
N
V06
V02
8
183.1
0.50
0
44(S10-1)
54(Sect.9)
109(future)
207
43.12
0.0960
0.4322
50.3
0.4272
2.4
n = 0.013
Refer to construction drawings for manhole locations.
4.0 CONCLUSIONS
It is our determination based on the criteria and data developed that the proposed sewer
line will provide sufficient capacity for the anticipated wastewater flows generated by this
development.
Design Report
Proposed Sanitary Sewer Line Improvements
for
Castlegate Subdivision - Section 10
College Station, Texas
August 2002
Prepared By:
TEXCON General Contractors
1707 Graham Road
College Station, Texas 77845
(979) 690-7711
S OF
TF~ 1
1.0 INTRODUCTION & DESCRIPTION
The purpose of this report is to provide a description of the proposed sanitary sewer to be
constructed with the Castlegate Subdivision - Section 10, and to provide the criteria used
in the design of this sanitary sewer system. The project will include the construction of
approximately 3,008 feet of sanitary sewer line. The line will service the proposed
development of the Castlegate Subdivision, Section 10, and the future development of
Castlegate Sections 11, 12 and 13.
2.0 SANITARY SEWER - Design Flow and Pipe Size Calculations
The proposed sewer line is to be constructed of 6"and 8" diameter SDR-26, PVC pipe
which meets the requirements of ASTM-D3034. The proposed manholes are 4' diameter
manholes, and vary from 7' to 16' in depth, with sewer line slopes ranging from 0.4% to
2.0%. The maximum distance between manholes is less than 500 feet, as required by the
Texas Natural Conservation Commission (TNRCC). The minimum allowable slopes for
8" and 6" pipes per TNRCC requirements are 0.33% and 0.50% respectively. All
construction shall meet the current City of College Station Standard Specifications for
Sanitary Sewer Construction. The sewer line information is summarized in Table 1.
3.0 DETERMINATION OF PEAK FLOW VALUES
The peak flows were based on using a daily use of 300 gallons per day for each dwelling
unit. The design peak flow is determined by multiplying the average daily flow by 1.5,
which results in the adjusted daily flow. This value is then multiplied by 3.0 to determine
the peak hourly flow. The velocities for the lines were calculated using Manning's
Equation. According to the TNRCC, the minimum velocity for sewer systems flowing full
is 2.0 feet per second. As shown in Table 1, the minimum anticipated flow velocities for
the proposed sewer lines at 50% full meet this requirement. The flow for 100% full will
not be less than the flow for 50% full; therefore, the TNRCC requirement is met. The
TNRCC requires that the maximum velocity for sewer systems flow full not exceed 10 feet
per second. The values in Table 1 are well below this maximum velocity.
TABLE I - SEWER LINE FLOW DATA
O
of
No
units From
Cumulative
Average
k Fl
P
Percent
50% Full
Z
d
Manhole
Number
Size
Length
Slope
.
Dwelling Unit
Merging
Dwelling
Daily/ Flow
ow
ea
FUII
Flow
Velocity
c
J
From
To
(in)
(ft)
Services
Lines
Units
(gpm)
(efs)
(cfs)
(°/a)
(cfs)
(fps)
1006
1005
6
308.2
2.00
12
12
2.50
0.0056
0.0251
12.2
0.3968
4.0
0
1005
1002
6
208.7
2.00
7
19
3.96
0.0088
0.0397
15.2
0.3968
4.0
rn
1002
V06
-
8
181.6
1.00
0
25(510-2)
44
9.17
0.0204
0.0919
12.4
0.6042
3.5
1004
1003
6
101.3
0.60
2
-
2
0.42
0.0009
2
6.9
0.2173
2.2
N
1003
1001
1002
1002
6
6
287.3
245.1
0.60
0.60
5
5
13
20
5
4.17
1.04
0.0093
-
0.0023
L0~010
4
20.9
10.7
0.2173
0.2173
2.2
2.2
c?
1 08
1007
6
241.4
1.90
12
12
2.50
0.0056
0.0251
12.3
0.3861
.9
j
007
1003
6
129.6
0.80
1
13
2.71
0.0060
0.0271
15.8
0.2509
2.6
1011
1010
6
217.3
1.10
8
8
1.67
0.0037
0.0167
11.6
0.2942
3.0
v
0
to
1010
-
1009
1009
_
V08
6
6
325.5
141.3
1.50
-
1.00
-
9
1
17
18
3.54
3.75
0.0079
0.0084
0.0355
0.0376
15.4
17.5
03436
0.2806
3.5
2.9
Future
VOS
8
26.8
0.40
87
87
18.12
0.0404
0.1817
33.2
2.2
V08
V07
8
180.9
0.40
0
18(510-4)
11 future
116
24.16
0.0538
0.2422
38.7
r0.3821
2.2
N
V07
V06
8
327.4
0.40
0
116
24.16
0.0538
0.2422
38.7
2.2
V06
V02
8
183.1
0.50
0
44(S10-1)
54(Sect.9)
109(future)
207
43.12
0.0960
0.4322
50.3
0.4272
2.4
n = 0.013
Refer to construction drawings for manhole locations.
4.0 CONCLUSIONS
It is our determination based on the criteria and data developed that the proposed sewer
line will provide sufficient capacity for the anticipated wastewater flows generated by this
development.
Design Report
Proposed Sanitary Sewer Line Improvements
for
Castlegate Subdivision - Section 10
College Station, Texas
August 2002
Prepared By:
TEXCON General Contractors
1707 Graham Road
College Station, Texas 77845
(979) 690-7711
i ~~P'•• I
OF •P•~sCHULTZ
1!
g,~6,a z
1.0 INTRODUCTION & DESCRIPTION
The purpose of this report is to provide a description of the proposed sanitary sewer to be
constructed with the Castlegate Subdivision - Section 10, and to provide the criteria used
in the design of this sanitary sewer system. The project will include the construction of
approximately 3,008 feet of sanitary sewer line. The line will service the proposed
development of the Castlegate Subdivision, Section 10, and the future development of
Castlegate Sections 11, 12 and 13.
2.0 SANITARY SEWER - Design Flow and Pipe Size Calculations
The proposed sewer line is to be constructed of 6"and 8" diameter SDR-26, PVC pipe
which meets the requirements of ASTM-D3034. The proposed manholes are 4' diameter
manholes, and vary from 7' to 16' in depth, with sewer line slopes ranging from 0.4% to
2.0%. The maximum distance between manholes is less than 500 feet, as required by the
Texas Natural Conservation Commission (TNRCC). The minimum allowable slopes for
8" and 6" pipes per TNRCC requirements are 0.33% and 0.50% respectively. All
construction shall meet the current City of College Station Standard Specifications for
Sanitary Sewer Construction. The sewer line information is summarized in Table 1.
3.0 DETERMINATION OF PEAK FLOW VALUES
The peak flows were based on using a daily use of 300 gallons per day for each dwelling
unit. The design peak flow is determined by multiplying the average daily flow by 1.5,
which results in the adjusted daily flow. This value is then multiplied by 3.0 to determine
the peak hourly flow. The velocities for the lines were calculated using Manning's
Equation. According to the TNRCC, the minimum velocity for sewer systems flowing full
is 2.0 feet per second. As shown in Table 1, the minimum anticipated flow velocities for
the proposed sewer lines at 50% full meet this requirement. The flow for 100% full will
not be less than the flow for 50% full; therefore, the TNRCC requirement is met. The
TNRCC requires that the maximum velocity for sewer systems flow full not exceed 10 feet
per second. The values in Table 1 are well below this maximum velocity.
TABLE 1 - SEWER LINE FLOW DATA
O
l
h
M
of
No
Units From
Cumulative
Average
k Fl
w
P
Percent
50% Full
Z
ro
e
an
o
Number
Size
Length
Slope
.
Dwelling Unit
Merging
Dwelling
Daily Flow
ea
o
Full
Flow
Velocity
J
From
To
(in)
(ft)
N
Services
Lines
Units
(gpm)
(CfS)
(cfs)
N
(CfS)
(fps)
1006
1005
6
308.2
2.00
12
12
2.50
0.0056
0.0251
12.2
0.3968
4.0
6
1005
1002
6
208.7
2.00
7
19
3.96
0.0088
0.0397
15.2
0.3968
4.0
rn
-
1002
V06
8
181.6
1.00
0
25(510-2)
44
9.17
0.0204
0.0919
12.4
0.6042
3.5
1004
1003
6
101.3
0.60
2
2
0.42
0.0009
0.0042
6.9
0.2173
2.2
N
c
rn
1003
-
1001
1002
1002
6
6
287.3
245.1
0.60
0.60
5
5
13
20
5
4.17
1.04
0.0093
0.0023
0.0418
0.0104
20.9
10.7
0.2173
0.2173
2.2
2.2
M
1008
1007
6
241.4
1.90
12
12
2.50
0.0056
0.0251
12.3
0.3867
3.9
o
1007
-j
1003
-
6
129.6
0.80
1
13
2.71
0.0060
0.0271
15.8
0.2509
2.6
1011
1010
6
217.3
1.10
8
8
1.67
0.0037
0.0167
11.6
0.2942
3.0
v
0
1010
1009
1009
V08
6
6
325.5
141.3
1.50
1.00
9
1
17
18
3.54
3.75
0.0079
0.0084
0.0355
0.0376
15.4
17.5
0.3436
0.2806
3.5
2.9
Future
V08
8
26.8
0.40
87
87
18.12
0.0404
0.1817
33.2
2.2
V08
V07
8
180.9
0.40
0
18(510-4)
11 future
116
24.16
0.0538
0.2422
38.7
r0.3821
2.2
V07
V06
8
327.4
0.40
0
116
24.16
0.0538
0.2422
38.7
2.2
U)
V06
V02
8
183.1
0.50
-
0
44(S70-1)
54(Sect.9)
109(future)
207
43.12
0.0960
0.4322
50.3
0.4272
2.4
n = 0.013
Refer to construction drawings for manhole locations.
4.0 CONCLUSIONS
It is our determination based on the criteria and data developed that the proposed sewer
line will provide sufficient capacity for the anticipated wastewater flows generated by this
development.
SUPPLEMENTAL DEVELOPMENT PERMIT INFORMATION
Application is hereby made for the following development specific site/waterway alterations:
ACKNOWLEDGMENTS:
I, Wo l lace .phi ( I t e, design engineer/owner hereby acknowledge or affirm that:
The information and conclusions contained in the above plans and supporting documents comply with the current
requirements of the City of College Station, Texas City Code, Chapter 13 and its associated Drainage Policy and Design
Standards. As a condition of approval of this permit application, I agree to construct the improvements proposed in this
application according to these documents and the requirements of Chapter 13 of th Colle e S ation City Code.
Property Owner(s)
CERTIFICATIONS: (for proposed alterations within designated flood hazard areas.)
A. 1, certify that any nonresidential structure on or proposed to be on this site
as part of this application is designated to prevent damage to the structure or its contents as a result of flooding from the
100 year storm.
Engineer Date
B. I certify that the finished floor elevation of the lowest floor, including any
basement, of any residential structure, proposed as part of this application is at or ab obase flood elevation
established in the latest Federal Insurance Administration Flood Hazard Study and maps` ,ngpnAX~,,,
Engineer
C. I, certify that the alterations or de
not diminish th flood-carrying capacity of the waterway adjoining or crossing this
or development are consistent with requirements of the City of College Station
encroachments of fl o ys and of loodway fringes. G
Engineer Date
Date
1ONAL
permit shall
r h alterations
3 concerning
D. I, do certify that the proposed alterations do not raise the level of the 100
year flood above elevation established in the latest Federal Insurance Administration Flood Hazard Study.
Engineer
Date
Conditions or comments as part of approval:
In accordance with Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure
that debris from construction, erosion, and sedimentation shall not be deposited in city streets, or existing drainage
facilities. All development shall be in accordance with the plans and specifications submitted to and approved by the City
Engineer for the above named project. All of the applicable codes and ordinances of the City of College Station shall
apply.
FNLPAPP.DOC 4/17/02