HomeMy WebLinkAboutDrainage ReportDRAINAGE REPORT
FOR
CALLAWAY-JONES
FUNERAL HOME
SITE IMPROVEMENTS
DECEMBER 15, Z010
PREPARED FOR:
CALJO, INC.
3001 SOUTH COLLEGE AVE.
BRYAN, TExAs 77801
MBESI No.10140011
McCLURE & BROWNE ENGINEERING/SURVEYING, INC.
1008 Woodcreek Dr., Suite 103 - College Station, Tx. 77845 (979) 693-3838 Engineer Reg. No. F-458
1314 10th Street, Suite 210 - Huntsville, Tx. 77320 - (936) 294-9749 Survey Reg. No. 101033-00
Callaway -Jones Funeral Home
Stormwater Management Technical Design Summary Report
MBESI No. 10140011
PART 1— Executive Summary Report
Section 1 — Contact Information:
Project Designer: McClure and Browne Engineering and Surveying, Inc.
1008 Woodcreek Drive, Suite 103
College Station, TX 77845
979-693-3838
Project Developer: Ca1Jo, Inc.
3001 South College Ave
Bryan, Texas 77801
979-822-3717
Submittal Date: December 15, 2010
Section 2 — General Information:
This development is a single lot funeral parlor to be constructed in College Station, 1000' south of the
intersection of F&B Road and F.M. 2818. The total area of the development is 3.45 acres.
Section 3 — Project Location:
The Callaway -Jones Funeral Home will be located in College Station on the west side of Harvey Mitchell
Parkway, 1000' south of the intersection of Harvey Mitchell Parkway and F&B Road. The entire project
site is located within the city limits of College Station. Refer to Exhibit A — Vicinity Map.
The project site is in the Whites Creek watershed. No portion of the site is located in the 100-year
floodplain (Zone AE) and is not regulated under the National Flood Insurance Program. Refer to Exhibit
B — Excerpt from FEMA FIRM Map # 48041CO143 C, July 2, 1992.
Section 4 — Hvdrolo2ic Characteristics:
The existing project site is un-grazed pasture land with few medium trees and underbrush. Under
developed conditions the site will be a funeral parlor, concrete pavement, and well maintained
landscaping areas. Discharges from the developed site will sheet flow across adjacent property to an
Unnamed Tributary to White Creek as indicated on Exhibit C-1 — Drainage Area Map for Peak Flow
Analysis. Under developed conditions stonnwater from the site will be conveyed to Point of Study "A"
via overland sheet flow. Discharges from the site will flow onto adjacent property and then to the primary
drainage system. According to the NRCS Web Soil Survey, existing soils on site are all in the Hydrologic
Soil Group D (refer to Exhibit D — Soils Map).
Stormwater Management Technical Design Summary Report
Callaway -Jones Funeral Home
Section 5 - Stormwater Management:
Per the BCS United Drainage Criteria Manual, this portion of the watershed lies in an "evaluate" section
which requires a detailed drainage analysis be conducted to determine whether stormwater detention will
` be required. According to the analysis performed in conjunction with this project, the peak flows from
this development will increase the peak flows of the existing drainage basin. Therefore, development will
have an adverse impact on dowstream properties and detention will be required. The property is divided
into three main drainage basins for pre- and post -development analysis. Each of these basins drain off of
the property in overland sheet flow. Drainage Basin 1 will not be affected by the proposed development
and has been excluded from the analysis. Drainage Basin 2 was analyzed using Point of Study "A".
Drainage Basin 3 was analyzed using Point of Study "B". Flow rates were determined at Points of Study
"A" and `B". Table 1 shows Pre- vs. Post -Developed Flow Rates at Point of Study "A". Table 2 shows
Pre- vs. Post -Developed Flow Rates at Point of Study "B". Refer to Exhibit E - Hydraflow Hydrograph
Calculations for more detailed calculations at the points of discharge.
Table 1: Pre- vs. Post-Develo ed Flow Rates at Point of Stud "A"
Return Period
Pre -Developed
(cfs)
Post -Developed
Change
cfs
Change
(%
2-Year
4.71
4.71
0.00
0.00
5-Year
7.56
7.46
-0.10
-1.35
10-Year
9.62
9.43
-0.19
-2.02
25-Year
1.3
1 10.9
-0.45
-3.96
50-Year
13.77
12.96
-0.81
-5.88
100-Year
15.83
14.55
-1.28
-8.09
Table 2: Pre- vs. Post -Developed Flow Rates at Point of Stud "B"
Return Period
Pre -Developed
cfs
Post -Developed
cfs
Change
cfs
Change
2-Year
0.83
0.62
-0.21
-25.18
5-Year
1.33
0.99
-0.35
-25.86
10-Year
1.70
1.25
-0.44
-26.12
25-Year
1.99
1.47
1 -0.53
-26.31
50-Year
2.42
1.78
-0.64
-26.57
100-Year
2.79
2.04
-0.74
-26.70
Stormwater from this project site will be conveyed by overland sheet flow from multiple discharge points
from the proposed detention ponds to Point of Study "A'. Exhibit C-2 - Drainage Area Map for
Detention Ponds and Inlets shows a delineation of drainage basins for all proposed detention ponds and
pond inlets.
I Section 6 - Coordination and Permitting:
This development requires coordination with TxDOT for a driveway permit. One 24" RCP Culvert will
be located within TxDOT R.O.W.
Stormwater Management Technical Design Summary Report
Callaway -Jones Funeral Home
,A71 T #F
ACTIO<
C01 T #23:
ACTION:
COI�IN�L�NT 24:
ACTION
COWMEM ENT #25:
ACTION:
COMMENT #26:
ACTION.
CO T #27:
ON:
COMMENT 428:
ACTIO
COMIC #29:
6ACION:
Please submit street sign plan and detail, to include correct block numbering. If you need
the street sign template, please let me know.
Duly Noted. Street Sign Detail and plan with correct block numbering will be submitted
upon approval and designation of block number.
Please verify and place note on plans that water services will be left between 2 and 3 feet
deep at the point of terminus by developer's contractor. Also note that a ball valve is
required at the point of terminus.
Duly Noted. See Revised Sheet C3.1.
(Drainage) As the construction of Callaway -Jones Way was required as a part of this
development, were the post development flows mitigated within this sites internal storm
mitigation system?
Yes, the post development flows have been accounted for and mitigated within the sites
internal storm mitigation system.
(Drainage Please provide a detention pond routing analysis summary table, identifying
the WSE at each storm event of each pond.
Storm Event
North Pond WSE
South Pond WSE
2-YR
342.36
343.30
5-YR
342.63
343.64
10- YR
342.80
343.89
25-YR
342.94
344.08
50-YR
343.09
344.34
100-YR
343.20
344.54
(Drainage) Does the North Pond include an emergency spill way?
Yes, the north berm of the north pond shall act as the emergency spillway during the 100-
yr event.
(Drainage)The North Pond appears to be missing 2 of the 3 outlet protections.
The missing outlet protections have been added. See Revised Sheet Cl.1.
(Drainage) What is the proposed surface treatment of the proposed spillways?
The proposed surface treatment shall be vegetative cover.
(Drainage) Any deviation form the BCS Drainage Guidelines -Detention Facility
Guidelines should be documented and defended in the Letter of Acknowledgment.
Duly Noted. See Revised Letter ofAcknowledgement
Callaway Jones Funeral Home — Final Plat Page 7 of 10
City Comment Response Letter
Section 7 — Reference:
Exhibit A
Vicinity Map
Exhibit B
Excerpt from FEMA FIRM
Exhibit C-1
Pre -Development Drainage Area Map for Peak Flow Analysis
Exhibit C-2
Post -Development Drainage Area Map for Peak Flow Analysis
Exhibit C-3
Drainage Area Map for Detention Ponds and Inlets
Exhibit D
Soils Map
Exhibit E
Hydraflow Hydrograph Calculations
Exhibit F
Technical Design Summary
Stormwater Management Technical Design Summary Report
Callaway -Jones Funeral Home
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VICINITY MAP
CALLAWAY--✓ONES FUNERAL HOME
COLLEGE STA770N, BR4ZOS COUNTY, TEXAS
UCCLE & BROWEENG/ENG/SUN, INC.rekN1031008 WcodcCo/1,ge
StaSon,
7X 77645
(979) 693-3636 Fax (979) 693-2554
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EXHIBIT D
Soils Map
Stormwater Management Technical Design Summary
Callaway -Jones Funeral Home
Hydrologic Soil Group —Brazos County, Texas
(MBESI No 10140011 - Callaway Jones Soil Report)
3W 36 W,
30° WIT
_ Map Sc e:12,030 W pMtetl anA sae(S.5"x 11")sheet
N Meters
a A 0 15 30 60 90
N feet
0 50 100 200 300
USDA Natural Resources Web Soil Survey
Conservation Service National Cooperative Soil Survey
ry
11/1512010
Page 1 of 4
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Hydrologic Soil Group —Brazos County, Texas
Hydrologic Soil Group
MBESI No 10140011 - Callaway Jones Soil Report
Hydrologic Soil Group —Summary by Map Unit— Brazos County, Texas
Map unitsymbol
Map unit name
Rating
Acres in AOI
Percent of AOI
Boa
Boonville fine sandy loam, 1 to 3
percent slopes
0
8.2
99.7%
Sa
Sandow loam, frequently flooded
C
0:0
0.3%
Totals for Area of Interest
8.2
100.0%
Description
Hydrologic soil groups are based on estimates of runoff potential. Soils are
assigned to one of four groups according to the rate of water infiltration when the
soils are not protected by vegetation, are thoroughly wet, and receive precipitation
from long -duration storms.
The soils in the United States are assigned to four groups (A, B, C, and D) and
three dual classes (A/D, B/D, and C/D). The groups are defined as follows:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained orwell drained
soils that have moderately fine texture to moderately coarse texture. These soils
have a moderate rate of water transmission.
�. Group C. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink -swell
potential, soils that have a high water table, soils that have a claypan or clay layer
at or near the surface, and soils that are shallow over nearly impervious material.
These soils have a very slow rate of water transmission.
If a soil is assigned to a dual hydrologic group (A/D, BID, or CID), the first letter is
for drained areas and the second is for undrained areas. Only the soils that in their
natural condition are in group D are assigned to dual classes.
Rating Options
Aggregation Method: Dominant Condition
Component Percent Cutoff., None Specified
Natural Resources Web Soil Survey 11/15/2010
Conservation Service National Cooperative Soil Survey Page 3 of 4
Hydrologic Soil Group —Brazos County, Texas
Tie -break Rule: Lower
USDA Natural Resources
4� Conservation Service
Web Soil Survey
National Cooperative Soil Survey
MBESI No 10140011 - Callaway Jones Soil Report
11115/2010
Page 4 of 4
EXHIBIT E
Hydraflow Hydrograph Calculations
Stormwater Management Technical Design Summary Report
__ Callaway -Jones Funeral Home
EXHIBIT E
Hydraflow Hydrograph Calculations
Stormwater Management Technical Design Summary Report
-- Callaway -Jones Funeral Home
1
Watershed Model Schematiqi ydraflow Hydrographs Extension for AutoCAD® Civil 3D02011 by Autodesk, Inc. v8
Legend
Hvd. Origin Description
1
SCS Runoff
Basin 1
2
SCS Runoff
Basin 2
3
SCS Runoff
Basin 2A
4
SCS Runoff
Basin 2B
5
SCS Runoff
Basin 2C
6
SCS Runoff
Basin 21)
7
SCS Runoff
Basin 3A
8
SCS Runoff
Basin 3B
9
SCS Runoff
Basin 3
10
Reservoir
North Pond
11
Reservoir
South Pond
12
Combine
Pr. POS A
13
Rational
Sub Basin
14
Rational
Sub Basin B
15
Rational
Sub Basin C
16
Rational
Sub Basin D
17
Rational
Sub -Basin E
18
Rational
Sub -Basin F
19
Combine
Pr. POS B
_Basin 1
Basin 2
Basin 3
_,3-=Basin 2A
f�
_4 -Basin 28
Basin 2C
11 -South Pond JIM 0 - North PondMaw-
/
Basin 3A
ca
_,$,Basin 3B
19 - Pr. POS B
C=6asin 2D
Ca
12 - Pr. POS A
Sub Basin A
Sub Basin B
Sub Basin C
1 -Sub Basin D
12— Sub -Basin E
_ 1�- Sub -Basin F
Project: 10140011-HydraFlow.gpw
Tuesday, Dec 14, 2010
L
Hydrograph Return Period RPP
ydcra ol ydrographs Extension for AutoCAD® Civil 3D® 2011 by Autodesk, Inc. v8
Hyd.
Hydrograph
Inflow
Peak Outflow (cfs)
Hydrograph
No.
type
hyd(s)
Description
(origin)
1-yr
2-yr
3-yr
5-yr
10-yr
25-yr
50-yr
100-yr
1
SCS Runoff
---
-----
0.304
-----
0.487
0.618
0.728
0.883
1.016
Basin 1',
2
SCS Runoff
---
---
4.706
----
7.563
9.624
11.35
13.77
15.83
Basin 2
3
SCS Runoff
----
---
4.710
-----
6.840
8.329
9.564
11.28
12.75
Basin 2A
4
SCS Runoff
--
-
4.042
----
5.823
7.069
8.101
9.539
10.77
Basin 2B
5
SCS Runoff
--
0.577
-----
0.926
1.177
1.386
1.680
1.930
Basin 2C
6
SCS Runoff
-----
-----
1.141
---
1.833
2.329
2.744
3.324
3.821
Basin 2D
7
SCS Runoff
---
----
0.232
---
0.364
0.458
0.537
0.647
0.740
Basin 3A
8
SCS Runoff
---
-----
0.389
----
0.625
0.794
0.936
1.134
1.303
Basin 3B
9
SCS Runoff
----
---
0.830
- - -
1.334
1.696
1.999
2.424
2.787
Basin 3
10
Reservoir
4
---
2.149
-----
3.711
4.836
5.614
6.719
7.497
North Pond
11
Reservoir
3
----
0.917
--
1.098
1.197
1.272
1.360
1.673
South Pond
12
Combine
5, 6, 10,
----
4.711
-----
7.461
9.430
10.90
12.96
14,55
Pr. POS A
11
13
Rational
-----
-----
2.042
----
2.521
2.810
3.201
3.608
3.778
Sub Basin A
14
Rational
----
----
1.839
----
2.270
2.531
2.882
3.249
3.402
Sub Basin B
15
Rational
---
----
3.445
-----
4.255
4.742
5.401
6.088
6.375
Sub Basin C
16
Rational
---
-----
0.252
---
0.311
0.347
0.395
0.446
0.467
Sub Basin D
17
Rational
----
----
0.830
-----
1.025
1.143
1.301
1.467
1.536
Sub -Basin E
18
Rational
--
----
2.734
-----
3.377
3.764
4.287
4.832
5.059
Sub -Basin F
19
Combine
7, 8,
-----
0.621
-----
0.989
1.253
1.473
1.780
2.043
Pr. POS B
Proj. file: 10140011-HydraFlow.gpw
Tuesday, Dec 14, 2010
25-Year Return Period
Stormwater Management Technical Design Summary Report
Callaway -Jones Funeral Home
Hydrograph
Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2011
Hyd. No. 12
Pr. POS A
Hydrograph type = Combine
Storm frequency = 100 yrs
Time interval = 2 min
Inflow hyds. = 5, 6, 10, 11
by Autodesk, Inc. v8 Tuesday, Dec 14, 2010
Peak discharge = 14.55 cfs
Time to peak = 12.13 hrs
Hyd. volume = 100,212 cuft
Contrib. drain. area = 0.715 ac
Q (Cfs)
15.00
Hyd.
Pr. POS A
No. 12 — 100 Year
Q (cfs)
- -
12.00
15.00
12.00
9.00
9.00
6.00
6.00
3.00
3.00
-- 0.00
0 2 4 6 8 10
® Hyd No. 12 —Hyd No. 5
® Hyd No. 11
0.00
12 14 16 18 20 22 24 26
—Hyd No. 6 —Hyd No. 10 Time (hrs)
Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3DO2011 by Autodesk, Inc. v8 Tuesday, Dec 14, 2010
Hyd. No. 9
Basin 3
Hydrograph type
= SCS Runoff
Peak discharge
= 2.787 cfs
Storm frequency
= 100 yrs
Time to peak
= 12.40 hrs
Time interval
= 2 min
Hyd. volume
= 16,326 cuft
Drainage area
= 0.536 ac
Curve number
= 80
Basin Slope
= 0.0 %
Hydraulic length
= 0 ft
Tc method
= TR55
Time of conc. (Tc)
= 34.20 min
Total precip.
= 11.00 in
Distribution
= Type III
Storm duration
= 24 hrs
Shape factor
= 484
Q (cfs
3.00
2.00
1.00
FIVIT11
0 2 4
® Hyd No. 9
Basin 3
Hyd. No. 9 -- 100 Year
6 8 10 12 14 16 18 20 22 24
Q (Cfs)
3.00
2.00
1.00
26
Time (hrs)
Hydrograph Report
Hydraflow Hydrographs Extension for AutoCAD® Civil 3D® 2011 by Autodesk, Inc. v8
Tuesday, Dec 14, 2010
Hyd. No. 19
Pr. POS B
Hydrograph type
= Combine
Peak discharge
= 2.043 cfs
Storm frequency
= 100 yrs
Time to peak
= 12.13 hrs
Time interval
= 2 min
Hyd. volume
= 8,089 Cuft
Inflow hyds.
= 7, 8
Contrib. drain. area
= 0.252 ac
Q (cfs)
3.00
2.00
m
ralff"A
0 2 4 6 8 10 12 14 16
® Hyd No. 19 — Hyd No. 7 — Hyd No. 8
18 20 22 24
Q (cfs)
3.00
2.00
1.00
26
Time (hrs)
EXHIBIT F
Technical Design Summary
Stormwater Management Technical Design Summary Report
Callaway -Jones Funeral Home
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
The Cities of Bryan and College Station both require storm drainage design to follow these
Unified Stormwater Design Guidelines. Paragraph C2 of Section III (Administration) requires
submittal of a drainage report in support of the drainage plan (stormwater management plan)
proposed in connection with land development projects, both site projects and subdivisions.
That report may be submitted as a traditional prose report, complete with applicable maps,
graphs, tables and drawings, or it may take the form of a "Technical Design Summary". The
format and content for such a summary report shall be in substantial conformance with the
-- description in this Appendix to those Guidelines. In either format the report must answer the
questions (affirmative or negative) and provide, at minimum, the information prescribed in the
"Technical Design Summary" in this Appendix.
The Stormwater Management Technical Design Summary Report shall include several parts
as listed below. The information called for in each part must be provided as applicable. In
addition to the requirements for the Executive Summary, this Appendix includes several
pages detailing the requirements for a Technical Design Summary Report as forms to be
completed. These are provided so that they may be copied and completed or scanned and
digitized. In addition, electronic versions of the report forms may be obtained from the City.
Requirements for the means (medium) of submittal are the same as for a conventional report
as detailed in Section III of these Guidelines.
Note: Part 1 — Executive Summary must accompany any drainage report
required to be provided in connection with any land development project,
regardless of the format chosen for said report.
Note: Parts 2 through 6 are to be provided via the forms provided in this
Appendix. Brief statements should be included in the forms as requested,
but additional information should be attached as necessary.
Part 1 — Executive Summary Report
Part 2 — Project Administration
Part 3 — Project Characteristics
Part 4 — Drainage Concept and Design Parameters
Part 6 — Plans and Specifications
Part 6 — Conclusions and Attestation
STORMWATER MANAGEMENT TECHNICAL DESIGN SUMMARY REPORT
Part 1 — Executive Summary
This is to be a brief prose report that must address each of the seven areas listed below.
Ideally it will include one or more paragraphs about each item.
Name, address, and contact information of the engineer submitting the report, and
of the land owner and developer (or applicant if not the owner or developer). The
date of submittal should also be included.
2. Identification of the size and general nature of the proposed project, including any
proposed project phases. This paragraph should also include reference to
applications that are in process with either City: plat(s), site plans, zoning requests,
STORMWATER DESIGN GUIDELINES Page 1 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
or clearing/grading permits, as well as reference to any application numbers or
codes assigned by the City to such request.
3. The location of the project should be described. This should identify the Named
Regulatory Watershed(s) in which it is located, how the entire project area is
situated therein, whether the property straddles a watershed or basin divide, the
approximate acreage in each basin, and whether its position in the Watershed
dictates use of detention design. The approximate proportion of the property in the
city limits and within the ETJ is to be identified, including whether the property
straddles city jurisdictional lines. If any portion of the property is in floodplains as
described in Flood Insurance Rate Maps published by FEMA that should be
disclosed.
4. The hydrologic characteristics of the property are to be described in broad terms:
existing land cover; how and where stormwater drains to and from neighboring
properties; ponds or wetland areas that tend to detain or store stormwater; existing
creeks, channels, and swales crossing or serving the property; all existing drainage
easements (or ROW) on the property, or on neighboring properties if they service
-- runoff to or from the property.
5. The general plan for managing stormwater in the entire project area must be
outlined to include the approximate size, and extent of use, of any of the following
features: storm drains coupled with streets; detention / retention facilities; buried
conveyance conduit independent of streets; swales or channels; bridges or culverts;
outfalls to principal watercourses or their tributaries; and treatment(s) of existing
watercourses. Also, any plans for reclaiming land within floodplain areas must be
outlined.
6. Coordination and permitting of stormwater matters must be addressed. This is to
include any specialized coordination that has occurred or is planned with other
entities (local, state, or federal). This may include agencies such as Brazos County
government, the Brazos River Authority, the Texas A&M University System, the
Texas Department of Transportation, the Texas Commission for Environmental
Quality, the US Army Corps of Engineers, the US Environmental Protection Agency,
et al. Mention must be made of any permits, agreements, or understandings that
pertain to the project.
7. Reference is to be made to the full drainage report (or the Technical Design
Summary Report) which the executive summary represents. The principal
elements of the main report (and its length), including any maps, drawings or
construction documents, should be itemized. An example statement might be:
"One -page drainage report dated , one set of
construction drawings (_sheets) dated and a
-page specifications document dated comprise
the drainage report for this project."
STORMWATER DESIGN GUIDELINES Page 2 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 2 — Project Administration
Start (Page 2.1)
Engineering and Design Professionals Information
Engineering Firm Name and Address:
Jurisdiction
McClure & Browne Engineering/Surveying, Inc.
City: Bryan
1008 Woodcreek Drive, Suite 103
X College Station
College Station, Texas 77845
Date of Submittal:
Lead Engineer's Name and Contact Info.(phone, e-mail, fax):
Other:
J. Dale Browne, Jr., P.E., CFM
Daniel R. Wetzel, E.I.T
Supporting Engineering / Consulting Firm(s):
Other contacts:
Developer / Owner / Applicant Information
Developer / Applicant Name and Address:
Phone and e-mail:
Ca1Jo, Inc.
979-822-3717
3001 S. College Ave.
Bryan, TX 77801
Property Owner(s) if not Developer / Applicant (& address):
Phone and e-mail:
Project Identification
Development Name: Callaway -Jones Funeral Home
Is subject property a site project, a single-phase subdivision, or part of a multi -phase subdivision?
Site Project If multi -phase, subject property is phase of
Legal description of subject property (phase) or Project Area:
(see Section 11, Paragraph B-3a)
3.45 acres Lot 1, Block 1, Subdivision
I s ' arty (phase) is second or later phase of a project, describe general statu
earlier phases. For it earlier phase Include submittal and r as.
General Location of Project Area, or subject property (phase):
Project site is located on Harvey Mitchell Parkway near the intersection of
Harvey Mitchell Parkway and F&B Road in College Station.
In City Limits?
Extraterritorial Jurisdiction (acreage):
Bryan: acres.
Bryan: College Station:
College Station: 3.45 ac. acres.
Acreage Outside ETJ:
STORMWATER DESIGN GUIDELINES Page 3 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 2 - Project Administration Continued (page 2.2)
Project Identification (continued)
Roadways abutting or within Project Area or
Abutting tracts, platted land, or built
subject property:
developments:
Harvey Mitchell Parkway
Charlie Mancuso 9395/252 (Undeveloped)
SM Propserties LLC 9874/242 (Undeveloped)
Valley Park Center 7675/282 (Valley Park)
Texas A&M Univ. System 1066/602WD (Undeveloped)
Texas A&M Univ. System 1172 308 (Undeveloped)
Named Regulatory Watercourse(s) & Watershed(s): Tributary Basin(s):
White Watershed Unnamed Tributary
Plat Information For Project or Subject Property (or Phase)
Preliminary Plat File #: 10-0050022S
Final Plat File #: 10-OOSO0257 Date:
Name: Knightsgate
Status and Vol/Pg: Pending Approval
If two plats, sec
Status:
Zoning Information For Project or Subject Property (or Phase)
Zoning Type: c-1 (3.45 ac. ) Existing or Proposed? Existing Case Code:
Case Date Status:
Zoning Type: Existing or Proposed? Case Code:
Case Date Status:
Stormwater Management Planning For Project or Subject Property (or Phase) f
nning Conference(s) & Date(s):
Participants:
Preliminary Report Require Submittal Date eview Date
Review Comments Addressed? Yes No_ InWr" 97 When?
Compliance With Preliminary Drainage R rt. 13ffefly describe (or attach documentation
explaining) any deviation(s) from provisions of P inary Drainage Report, if any.
STORMWATER DESIGN GUIDELINES Page 4 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 2 — Project Administration
Continued (page 2.3)
Coordination For Project or Subject Property (or Phase)
Note: For any Coordination of stormwater matters indicated below, attach documentation
describing and substantiating any agreements, understandings, contracts, or approvals.
Dept.
Contact:
Date:
Subject:
Coordina
With Other
Departments of
Jurisdiction
City (Bryan or
College Station
Coordination With
arize need(s) & actions taken (include contacts & dates):
Non jurisdiction
City Needed?
Yes No X
Coordination with
Summarize need(s) & actions inc ontacts & dates):
Brazos County
Needed?
Yes No X
Coordination with
Summarize need(s) & actions taken (include contacts & dates):
A TxDOT driveway permit will be required for this project.
TxDOT Needed?
Yes X No
Coordination with
Summarize need(s) & actions taken (include contacts & dates):
TAMUS Needed?
Approval of sewer service connection to TAMUS sewer system.
Yes X No
Permits For Project or Subject Property (or Phase)
As to stormwater management, are permits required for the proposed work from any of the entities
listed below? If so, summarize status of efforts toward that objective ins aces below.
Entity
Permitted or
Status of Actions (include dates)
a
Approved .
US Army Crops of
Engineers
No X Yes _
US Environmental
Protection Agency
No X Yes _
Texas Commission on
A Stormwater Pollution Prevention Plan must be
Environmental Quality
implemented prior to the start of construction
No Yes X
according to TPDES General Permit No. TXR150000.
Brazos River
Authority
No X Yes
STORMWATER DESIGN GUIDELINES Page 5 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 3 — Property Characteristics
Start (Page 3.1)
Nature and Scope of Proposed Work
Existing: Land proposed for development currently used, including extent of impervious cover?
Existing undeveloped land (pasture, with trees and underbrush). Existing
impervious cover is approximately 0 sf.
Site
Redevelopment of one platted lot, or two or more adjoining platted lots.
Development
x Building on a single platted lot of undeveloped land.
Project
Building on two or more platted adjoining lots of undeveloped land.
(select all
applicable)
Building on a single lot, or adjoining lots, where proposed plat will not form
a new street (but may include ROW dedication to existing streets).
Other (explain):
Subdivision
Cons r reets and utilities to serve one or ots.
Development
Construction of street s e or more proposed lots on
Project
Ian ad by pending plats.
Site proiects: building use(s), approximate floor space, impervious cover ratio.
Describe
Subdivisions: number of lots by general type of use, linear feet of streets and
Nature and
drainage easements or ROW.
Size Of
This project includes the addition of a single story funeral parlor
Proposed
buildings with associated paving and drainage facilities.
Project
Ex. I.C.= 0 sf (0%); Pr. I.C.= 71,757 sf (48%)
Is any work planned on land that is not platted
i lain:
or on land for which platting is not pending?
X No Yes
FEMA Floodplains
Is any pan of subject property abutting a Named Regulatory Watercourse
No Yes X
(Section 11, Paragraph B1) or a tributary thereof?
Is any pan of subject property in floodplain
No X Yes Rate Map 48041CO181 C
area of a FEMA-regulated watercourse?
—
Encroachment(s)
Encroac urpose(s): Building site(s) Roa ng(s)
into Floodplain
areas planned?
_ Utility crossing(s) ther (ex
No X
Yes
areas not shown on Rate Maps, has work been done toward amending the F
approved Floo define allowable encroachments in proposed are ain.
STORMWATER DESIGN GUIDELINES Page 6 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 3 — Property Characteristics
Continued (Page 3.2)
Hydrologic Attributes of Subject Property
(or Phase)
Has an earlier hydrologic analysis been done for larger area including subject property?
ference the study (& date) here, and attach copy if not already in City files.
Yes
Is the stormwater nagement plan for the property in substantial con f ance with the
earlier study? Yes No If not, explain how it di s.
If subject property is not part of multi-phas 'ect, describe stormwater management
No
X
plan for the property in Part 4.
If property is part of multi -phase ject, provide overvlbwof stormwater management plan
for Project Area here. In Pa describe how plan for subs t property will comply
therewith.
Do existing topographic features on subject property store or detain runoff? x No Yes
Describe them (include approximate size, volume, outfall, model, etc).
Any known drainage or flooding problems in areas near subject property? x No Yes
Identify:
Based on location of study property in a watershed, is Type 1 Detention (flood control) needed?
(see Table B-1 in Appendix B)
x Detention is required. _ Need must be evaluated. Detention not required.
What decision has been reached? By whom?
Detention will be required per study performed by McClure & Browne.
If the need for
How was determination made?
Type Detention
A hydrologic analysis shows that by increasing the peak runoff
must be evaluated:
for the site, stormwater will exceed the peak runoff of the
site to the outfall.
STORMWATER DESIGN GUIDELINES Page 7 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 3 — Property Characteristics
Continued (Page 3.3)
Hydrologic Attributes of Subject Property (or Phase)
(continued)
Does subject property straddle a Watershed or Basin divide? x No _ Yes If yes,
describe splits below. In Part 4 describe design concept for handling this.
Watershed or Basin
Larger acreage
Lesse e
Above -Project Areas(Section II, Paragraph B3-a)
Does Project Area (project or phase) receive runoff from upland areas? x No _ Yes
Size(s) of area(s) in acres: 1) 2) 3) 4)
Flow Characteristics (each instance) (overland sheet, shallow concentrated, recognizable
concentrated section(s), small creek (non -regulatory), regulatory Watercourse or tributary);
1) Overland Sheet
Flow determination: Outline hydrologic methods and assumptions:
NRCS Method was used. The site contains HSG D soils. The following Curve
Numbers were used:
Open Spaces=80; Commercial and Business District=95;
Does storm runoff drain from public easements or ROW onto or across subject property?
x No _ Yes If yes, describe facilities in easement or ROW:
Are changes in runoff characteristics subject to change in future? Explain
There is no undeveloped upland areas located above the project site.
Conveyance Pathways (Section 11, Paragraph C2)
Must runoff from study property drain across lower properties before reaching a Regulatory
Watercourse or tributary? No x Yes
Describe length and characteristics of each conveyance pathway(s). Include ownership of
property(ies).
375 LP of overland sheet flow into Unnamed Tributary.
BM Properties LLC 9874/242 (Undeveloped)
STORMWATER DESIGN GUIDELINES Page 8 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 3 — Property Characteristics
I Continued (Page 3.4)
Hydrologic Attributes of Subject Property (or Phase) (continued)
Conveyance Pathways (continued)
Do drainage
I r what part of length? % Created by? _ pla
easements
instru If instrument(s), describe their provisio
exist for any
part of
pathway(s)?
x No
Yes
Where runoff must cross lower properties, describe characteristics of abutting lower
property(ies). (Existing watercourses? Easement or Consent aquired?)
Un-grazed pasture with no shallow or defined channels.
Pathway
consent Aquired.
Areas
Describe any built or improved drainage facilities existing near the property (culverts,
bridges, lined channels, buried conduit, swales, detention ponds, etc).
There is one existing pond located to the north of the property that
is currently under study to be removed.
Nearby
Drainage
Facilities
Do any of these have hydrologic or hydraulic influence on proposed stormwater
design? X No _Yes If yes, explain:
STORMWATER DESIGN GUIDELINES Page 9 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Start (Page 4.1)
Stormwater Management Concept
Discharge(s) From Upland Area(s)
ff is to be received from upland areas, what design drainage features will be used t
accomm it and insure it is not blocked by future development? Describe fo area,
flow section, or i e point.
Discharge(s) To Lower Property(ies) (Section ll, Paragraph E1)
Does project include drainage features (existing or future) proposed to become public via
platting? x No _Yes Separate Instrument? X No Yes
er Guidelines reference above, how will
Establishing Easements (Scenario 1)
ru ff be discharged to neighboring
Pre -development Release (Scenari )
prop (ies)?
Combination of the two Scenari
Scenario 1. If easements are proposed, describe where needed, and provide stat of actions
on each. (Alta ad Exhibit #_)
Scenario 2: Provide general de ription of how release(s) wil a managed to pre -development
conditions (detention, sheet flow, p ially concentrated, et .. (Attached Exhibit # )
Combination: If combination is pro sed, explain how d harge will differ from pre -
development conZffiontherty line for each area (oIf
Scenario 2, o be used, has proposed design been coor ' ated with
owners) of r eiving property(ies)? No Yes Explain and pro ' e
documen on.
STORMWATER DESIGN GUIDELINES Page 10 of26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.2)
Stormwater Management Concept (continued)
Within Proiect Area Of Multi -Phase Project
gaining Basins or Watersheds and acres shifting:
Will project result
in shifting runoff
between Basins or
between
What design and mitigation is us pensate for increased runoff
Watersheds?
from gaining basin orwatersh
x No
Yes
How will runoff from Project
1. _ ' fac�ility0es) involving other develo%pme ects.
Area be mitigated to pre-
2 Establishing Fee to s erale cs� I Project Area.
development conditions?
Select any or all of 1, 2,
3. _ On phas i e) project basis Project Area.
and/or 3, and explain below.
ared facilit (type & location of facility; design drainage area served; relationship to size
Projec a): (Attached Exhibit #_)
2. For Overall Project Area (type & location a 'At' s): (Attached Exhibit #)
site roject: Describe plannedent
questions of this Part.
M�Rmphase-ror
aquatic echosystems proposed? No _Yes In which phase(s) orproje
?Are
other Best Manag-8nqQnt Practices for reducing stormwate ollutants proposed?
a
No Su rize type of BMP and ent of use:
I
—Yes
rn
aU o
O Z
If design of any runoff-handlin cilities deviate from p isions of B-CS Technical
a x
Specifications, check ty acility(ies) and explain in later q ions.
W
Detention ents Conduit elements Cha I features
Sw Ditches Inlets Valley gutters _ all$
Culvert features _ Bridges Other
STORMWATER DESIGN GUIDELINES Page 11 of26 APPENDIX. D: TECH. DESIGN SUMMAR`
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
IContinued (Page 4.3)
Stormwater Management Concept (continued)
Within Project Area Of Multi -Phase Project (continued)
Will Project Area include bridge(s) or culvert(s)? x No Yes Identify type and
_
general size and In which phase(s).
I n/retention serves (will serve) overall Project Area, describe how it relates t
phase or site pr ' h sical location, conveyance pathway(s), constru quence):
Within Or Serving Subject Property (Phase, or Site)
art of larger Project Area, is design in substantial conform earlier analysis
and report for =a? Yes No, then a3 nze the difference(s):
Identify whether each of the types of drainage features listed below are included, extent
and general characteristics.
—rlllcal shape? Surfaces?
Steepest side es:
Usual front slopes:
ual back slopes:
N
Flow line slopes: least
Typical distance from travelway:
=a
typical greatest
(Attached Exhibit #)
o
N z
a
o xl
Are longitudi culvert ends in compliance with R-CS Standar ecifications?
°'
s No, then explain:
yAl-intersections
or otherwise, do valley gutters cross arterial or collector stree
Yes If yes explain:
o a
NAre
valley gutters proposed to cross away from an intersection?
mo
rnZ
_ No _ Yes Explain: er of loca' ?
ti a
X
Q
STORMWATER DESIGN GUIDELINES Page 12 of26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.4)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
tter line slopes: Least Usual Greatest
Are i ets recessed on arterial and collector streets? Yes No If
identify here and why.
Will inlets captur 10-year design stormflow to prevent flooding of int sections (arterial
with arterial or colle or)? _ Yes No If no, explain ere and why not.
a
(D
Will inlet size and placemen revent exceeding allowabl ater spread for 10-year
W
design storm throughout site (o hase)? Yes No If no, explain.
5
om
a�
n
Sao curves: Are inlets placed at low poin ? Yes _ No Are inlets and
conduit sized to prevent 100-year stormflo om ponding at greater than 24 inches?
L o
_ Yes No Explain "no" swer
N
N
N
N
a)
Will 100-yr stormflow be ntained in combination of ROW aN buried conduit on
whole length of all str ts? Yes No If no, des 'be where and why.
for curb, gutter, and inlets comply with B-CS Technical Specifics' ns?
7desig
es _ No If not, describe difference(s) and attach justification.
Are any 12-inch laterals used? No X Yes Identify length(s) and where
used. Approximately 106 LF of 12" HDPE pipe is used to drain the north
detention pond.
r
m
Pipe runs between system
Typical 53' Longest 53'
access points (feet):
}
m XI
Are junction boxes used at each bend? Yes x No If not, explain where
>
and why.
c
No Bends are required.
o
Z
-`o
E
y
Are downstream soffits at or below upstream soffits?
Least amount that hydraulic
N
Yes X No If not, explain where and why:
grade line is below gutter line
(system -wide):
-0.25 ft.
STORMWATER DESIGN GUIDELINES Page 13 of 26 APPENDIX. D: TECH. DESIGN SUMMAM
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.5)
Stormwater Management Concept
(continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Describe watercourse(s), or system(s) receiving system discharge(s) below
(include design discharge velocity, and angle between converging flow lines).
0
1) Watercourse (or system), velocity, and angle?
North Detention pond outfall to overland sheet flow V= < 6 fps
a)
`o
E
2) Watercourse (or system), velocity, and angle?
South Detention pond outfall to overland sheet flow V= < 6 fps
C O
tim
3) Watercourse (or system), velocity, and angle?
T
�
�a
0
N O
a` a
E -
For each outfall above, what measures are taken to prevent erosion or scour of
in a)
receiving and all facilities at juncture?
N
1) Concrete Embedded with 8" diameter river rock
(6
fl-
N
2) Concrete Embedded with 8" diameter river rock
m
0
3)
swale(s) situated along property lines between properties? No Yes
Num r of instances: For each instance answer the following questions.
Surface tr ments (including low -flow flumes if any):
a�
c }
Flow line slopes (minimum a maximum):
a`
0
0 o
z
Outfall characteristics for each (velocity, c ver t angle, & end treatment).
A xl
3
m
m
Will 100-year designOSrm runoff be contained within easement(s r platted drainage
ROW in all insta s? _ Yes No If "no" explain:
STORMWATER DESIGN GUIDELINES Page 14 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.6)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
r side ditches used? No Yes If so, provide the followin
4)
Is 25-year o tained with 6 inches of freeboard throughout ? s No
_
Are top of banks separa road shoulders 2 feet o e. _Yes _ No
a�
Are all ditch sections trapezoidal an s . eat deep? _ Yes No
N
For any "no" answers provide I s) and exp .
a
0
0
conduit is beneath a swale, provide the following information (each instance).
Instance 1 Describe general location, approximate length:
N
Y
Is 100-ye design flow contained in conduit/swale combination? _ Ye —No
"no" expla'
UIf
o m
Space for 100-ye r storm flow? ROW Easement _ th
Z c
Swale Surface ty , minimum
Conduit Type and size, minimyKnand maximum
X m
and maximum slopes:
slopes, design storm:
c
0
o-
m
Inlets Describe how condui 's loaded (from streets/stor drains, inlets by type):
—
� a
ca
ca
U p
0 o
Access Describe how maintenance cess is p vided (to swale, into conduit):
o E
E
4) o
m
Instance 2 Describe general location, ppro ' ate length:
a E
m �
n L3
Is 100-year design flow containe in conduit/swale c bination?
—Yes —No
If "no" explain:
c o-
E t
Space for 100-year storm ow? ROW _ Easement Width
o
0
Swale Surface type, imum
Conduit Type and size, mi 'mum and maximum
m
and maximum slope '
slopes, design storm:
c `m
NInlets
—Describe ow conduit is loaded (from streets/storm drains, in] s by type):
a�
m �
3 0
y
�
escribe how maintenance access is provided (to swale, into cond '
7"f
STORMWATER DESIGN GUIDELINES Page 15 of26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters I Continued (Page 4.7)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
"yes" provide the following information for each instance:
Ins t ce 1 Describe general location, approximate length, surfacing:
c
o w
= ";
Is 100-year design w contained in swale? _ Yes _ No Is swale wholly
C >,
within drainage ROW . Yes _ No Explain "no" savers:
Access Describe how mainte nce access is provide
0
Z
a
c g
0
0
Instance 2 Describe general location, ap ximate length, surfacing:
a>
c a..
� m
n �
a�
o E
� a
3 m
Is 100-year design flow co fined in swale? _ Yes No Is swale wholly
`0
within drainage ROW? Yes No Explain "no answers:
_
N O
X
Access Descr' a how maintenance access is provided:
U_
Q
3
CL
Ins nce 3 4 etc. If swales are used in more than two instances, attach sheet
/providing all above information for each instance.
w" channels: Will any area(s) of concentrated flow be channelized (deepened
wide or straightened) or otherwise altered? _ No _ Yes If only s' tly
shaped, s "Swales" in this Part. If creating side banks, provide informati elow.
Will design rep li a natural channel? _ Yes No If "no", r each instance
o Q
describe section sha &area, flow line slope (min. & max.), s ces, and 100-year
o w
design flow, and amount reeboard:
0
Instance 1:
a
0
E
a)
>
0
Instance 2:
a
E o
— Z
x)
Instance 3:
as
U
STORMWATER DESIGN GUIDELINES Page 16 of26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.8)
Stormwater Management: Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
\Existing channels small creeks): Are these used? No Yes
I " es" provide the information below.
Wi small creeks and their floodplains remain undisturbed? _ Yes No How
_
man disturbance instances? Identify each planned location:
For each Ioc tion, describe length and general type of proposed impro ment
(including floo lain changes):
For each location, des ibe section shape & area, flow line sl a (min. & max.),
surfaces, and 100-year sign flow.
c
c
Watercourses (and tributaries): ide from fri a changes, are Regulatory
Watercourses proposed to be altered. _ o _Yes Explain below.
Submit full report describing proposed c n es to Regulatory Watercourses. Address
E
existing and proposed section size and sh e, surf aces, alignment, flow line changes,
>
length affected, and capacity, and provid f documentation of analysis procedures
and data. Is full report submitted? s No If "no" explain:
a
E
m
c
c
vAll
Proposed Channel Work: or all proposed chan eI work, provide information
requested in next three boxe .
If design is to replicate nat al channel, identify location a length here, and describe
design in Special Design ection of this Part of Report.
Y _ No If
Will 100-year flo be contained with one foot of freeboard? -A"
not, identify loc ion and explain:
/ easements sized to contain channel and required maintenance sp
_ No If not, identify location(s) and explain:
7as
STORMWATER DESIGN GUIDELINES Page 17 of26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.9)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
How many facilities for subject property project? 2 For each provide info. below.
For each dry -type facilitiy:
Facility 1
Facility 2
Acres served & design volume + 10%
1.058
8,910 CF
1.260
22,429 CF
100-yr volume: free flow & plugged
4,805 Ca
8,910 CF
17,557 CF
22,429 CF
Design discharge (10 yr & 25 yr)
.536 cfs
5.614 cfs
1.197 cfs
1.272 cfs
Spillway crest at 100-yr WSE?
_ yes x no
t yes no
Berms 6 inches above plugged WSE?
x yes _ no
x yes _ no
Explain any "no" answers:
Berm surrounding facility 1 is at elevation of 344.00 and will serve
as the spillway, should that elevation be reached.
w
a�
r
xlFor
each facility what is 25-yr design Q, and design of outlet structure?
Facility 1: 5.614 cfs, 10" and 12" HDPE multi -stage outlet pipes.
O
Z
Facility 2: 1.272 cis, 6" HIIPE single stage outlet pipe.
Do outlets and spillways discharge into a public facility in easement or ROW?
Facility 1: —Yes t No Facility 2: —Yes X No
-moo
If "no" explain: All outlets and spillways are designed to return the
odischarge
to overland sheet flow.
a
0
o
For each, what is velocity of 25-yr design discharge at outlet? & at s ilp Iwav?
Facility 1: 5.5 fps & N/A Facility 2: 6.2 fps & N/A
Are energy dissipation measures used? No t Yes Describe type and
u-
_
location: Concrete Embedded with 8" diameter river rock
c
0
0
E
For each, is spillway surface treatment other than concrete? Yes or no, and describe:
Facility 1:No, N/A
Facility 2:No, spillway will be concrete.
For each, what measures are taken to prevent erosion or scour at receiving facility?
Facility l: Concrete Embedded with 8" diameter river rock and pilot channels
Facility 2:Concrete Embedded with 8" diameter river rock and pilot channels
If berms are used give heights, slopes and surface treatments of sides.
Facility 1: 345.00, 4:1 slope outside, 3:1 slope inside, grass
Facility 2: 344.00, < 4:1 slope outside, 3:1 slope inside, grass
STORMWATER DESIGN GUIDELINES Page 18 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.10)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Do structures comply with B-CS Specifications? Yes or no, and explain if "no":
Facilityl; No, slopes interior to the detention pond are 3:1.
u_
C
Facility 2: No, slopes interior to the detention pond are 3:1.
C o c
»J o
c v
N
oFor
additional facilities provide all same information on a separate sheet.
Are parking areas to be used for detention? No X Yes What is
maximum depth due to required design storm? 0.241�, 100-YR
oadside Ditches: Will culverts serve access driveways at roadside ditches?
No _Yes If "yes", provide information in next two boxes.
Will 2 -yr. flow pass without flowing over driveway in all cases? Yes No
Without using flowing or standing water on public roadway? _ Yes _ No
Designs & terials comply with B-CS Technical Specifications? Y s —No
Explain any "n " answers:
N
Ol
C
oAre
culverts parallel to public r dway alignment? Yes No Explain:
u 0
a)
m
Q (
Creeks at Private Drives: Do private d ' e ys, drives, or streets cross drainage
ways that serve Above -Project areas or arpVTpublic easements/ ROW?
aa) z
—No Yes If "yes" provid nfor tion below.
N XI
How many instances? De vibe locatio nd provide information below.
�
Location 1:
U
u
Location 2:
Location 3:
For location enter value for:
1
2
3
Design ye passing without toping travelway?
Water epth on travelway at 25-year flow?
W er depth on travelway at 100-year flow?
or more instances describe location and same information on separate sheet.
STORMWATER DESIGN GUIDELINES Page 19 of26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.11)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
amed Reoulatory Watercourses I& Tributaries): Are culverts proposed on these
ilities? No Yes, then provide full report documenting assumptions
cri ria, analysis, computer programs, and study findings that support proposed
des i (a). Is report provided? Yes _ No If "no", explain:
m
Arterial or aior Collector Streets: Will culverts serve these types of r dways?
NNo
Yes How many instances? For each id tify the
a)
location and pro ide the information below.
v
Instance 1:
y
Instance 2:
c
o
Instance 3:
c
0
o t
z
Yes or No for the 100-year esign flow:
1
2
3
E
`o
Headwater WSE 1 foot below west curb top?
c
m
E
Spread of headwater within RO or easement?
Is velocity limited per conditions (Ta e C-11)?
Explain any "no" answer(s):
N
22 O
U -
T (6
(6 U
Xculveserve
3 0
o s
Minor Collector or Local Streets: these types of streets?
No Yes How m y instances? for each identify the
location and provide the informati below:
aro
a
Instance 1:
Instance 2:
Ca
o
Instance 3:
� N
For each instance ant value, or "yes" / "no" for:
1
2
3
U 6
c
Design yr. headwat WSE 1 ft. below curb top?
100-yr. max. dep at street crown 2 feet or less?
E
Product of veto ity (fps) & depth at crown (ft) = ?
Is velocity li ited per conditions (Table C-11)?
Limit of d n stream analysis (feet)?
Explain ny "no" answers:
STORMWATER DESIGN GUIDELINES Page 20 of26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.12)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
II Pro osed Culverts: For all proposed culvert facilities (except driveway/roadside
ch intersects) provide information requested in next eight boxes.
Do 41verts and travelways intersect at 90 degrees? _ Yes No If not,
identi location(s) and intersect angle(s), and justify the design(s):
Does drainag way alignment change within or near limits of culvert and urfaced
approaches the to? _ No _ Yes If "yes" identify locations) ascribe
change(s), and ju tification:
Are flumes or conduit to d charge into culvert barrel(s)? No —Yes If yes,
identify location(s) and prov a justification:
Are flumes or conduit to discharge i to or near su ced approaches to culvert ends?
No _ Yes If "yes" identi location(s describe outfall design treatment(s):
c
0
U
N
Is scour/erosion protection provided to nsure I g term stability of culvert structural
0
components, and surfacing at culve ends? Yes —No If "no" Identify
locations and provide justification(
Will 100-yr flow and spreqd of backwater be fully contained street ROW, and/or
drainage easements/ R ? _ Yes _ No if not, wh ot?
Do appreciable draulic effects of any culvert extend downstream o pstream to
neighboring la (s) not encompassed in subject property? No Yes If
yes" describ location(s) and mitigation measures:
A all culvert designs and materials in compliance with B-CS Tech. Specifications?
Yes _ No If not, explain in Special Design Section of this Part.
STORMWATER DESIGN GUIDELINES Page 21 of26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.13)
Stormwater Management Concept (continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
bridge included in plans for subject property project? _ No _ Yes
If "ye " rovide the following information.
Name(s) a functional classification of the roadway(s)?
What drainage ways) is to be c sed?
m
a
rn
v
ro
A full report supporting al spects of the proposed bridge(s tructural, geotechnical,
hydrologic, and hydr is factors) must accompany this summer eport. Is the report
provided. es _ No If "no" explain:
Is a Stormwater
Provide a general description of planned techniques:
Pollution Prevention
Silt fence and inlet filtration will serve as the
Plan (SW3P)
main protection against stcrmwater pollution. The
C1
established for
project construction?
Contractor shall use any other means necessary
m
throughout construction.
No X Yes
Special Designs — Non -Traditional Methods
Are any non-traditional methods (aquatic echosystems, wetland -type detention, natural stream
replication, BMPs for water quality, etc.) proposed for any aspect of subject property project?
X No —Yes If "yes" list general type and location below.
full report about the proposed special design(s) including rationale for use and
expected be Report must substantiate that stormwater management ' as will not
be compromised, an intenance cost will not exceed thos itional design
solution(s). Is report provided? _ Yes N no" explain:
STORMWATER DESIGN GUIDELINES Page 22 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.14)
Stormwater Management Concept
(continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Special Designs — Deviation From B-CS Technical Specifications
If any design(s) or material(s) of traditional runoff -handling facilities deviate from provisions of
B-CS Technical Specifications, check type facility(ies) and explain by specific detail element.
Detention elements Drain system elements Channel features
Culvert features Swales Ditches Inlets _Outfalls
Valley gutters Bridges (explain in bridge report)
able below briefly identify specific element, justification for deviation(s).
cific Detail Element
Justification for Deviation (attach additional sheets if eded)
1)
2)
3)
4)
5)
Have elements been coordina d with the City Engineer or her designee? For each item
above provide "yes" or "no", action date, and staff name:
1)
2)
3)
4)
5
Design Parameters
Hydrology
Is a map(s) showing all Design Drainage Areas provided? x Yes No
ummarize the range of applications made of the Rational Formula:
What is the size cation of largest Design Drainage Area to which Tonal Formula
has b pplied? acres Location (or identifier):
STORMWATER DESIGN GUIDELINES Page 23 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.15)
Design Parameters (continued)
Hydrology (continued)
In making determinations for time of concentration, was segment analysis used?
x No _ Yes In approximately what percent of Design Drainage Areas? %
As to intensity -duration -frequency and rain depth criteria for determining runoff flows, were any
criteria other than those provided in these Guidelines used? x No Yes If "yes'
identify type of data, source(s), and where applied:
For each of the stormwater management features listed below identify the storm return
frequencies (year) analyzed (or checked), and that used as the basis for design.
Feature
Analysis Year(s)
Design >aK
Storm system for arterial and collector streets
Storm drain sys forlocalstreets
Open channels
Swale/buried conduit combing' in lieu of channel
Swales
Roadside ditches and culverts serving them
Detention facilities: spillway crest and ' outfall
Detention facilities: outlet and veyance structure(s)
Detention facilities: volu when outlet plugged
Culverts servin9,pnvate drives or streets
Culverts ing public roadways
. ges: provide in bridge report.
Hydraulics
What is the range of design flow velocities as outlined below?
Design flow velocities;
Gutters
Conduit
Culverts
Swales
Channels
Highest (feet per second)
6.37
Lowest (feet per second)
2.80
Streets and Storm Drain Systems Provide the summary information outlined below:
Roughness coefficients used: For street gutters: 0 . 013
For conduit type(s) HD"E 0.012 Coefficients:
STORMWATER DESIGN GUIDELINES Page 24 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised February 2009
SECTION IX
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.16)
Design Parameters (continued)
Hydraulics (continued)
Street and Storm Drain Systems (continued)
For the following, are assumptions other than allowable per Guidelines?
Inlet coefficients? x No _Yes Head and friction losses x No _Yes
Explain any "yes" answer:
In conduit is velocity generally increased in the downstream direction? x Yes _ No
Are elevation drops provided at inlets, manholes, and junction boxes? X Yes _ No
Explain any "no" answers:
Are hydraulic grade lines calculated and shown for design storm? x Yes _ No
For 100-year flow conditions? X Yes _ No Explain any "no' answers:
What tailwater conditions were assumed at outfall point(s) of the storm drain system? Identify
each location and explain:
N/A
en Channels If a HEC analysis is utilized, does it follow Sec VI.F.5.a? Yes
Outside straight sections, is flow regime within limits of sub -critical flow? _ Yes _ No
If "no" list to ions and explain:
Culverts If plan sheets do t provide the following for each c ert, describe it here.
For each design discharge, will op tion be outlet (barrel ntrol or inlet control?
Entrance, friction and exit losse
:S:
Brid Provide all in bridge report
STORMWATER DESIGN GUIDELINES Page 25 of 26 APPENDIX. D: TECH. DESIGN SUMMAR)
Effecbve February 2007 As Revised February 2009
SECTION IX
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.17)
Design Parameters (continued)
Computer Software
What computer software has been used in the analysis and assessment of stormwater
management needs and/or the development of facility designs proposed for subject property
project? List them below, being sure to identify the software name and version, the date of the
version, any applicable patches and the publisher
Hydraflow Hydregraphs for AutoCAD 2011
Part 5 — Plans and Specifications
Requirements for submittal of construction drawings and specifications do not differ due to use of a
Technical Design Summary Report. See Section III, Paragraph C3.
Part 6 — Conclusions and Attestation
Conclusions
Add any concluding information here:
The Callaway -Jones Funeral Home Site Improvements will have no adverse impact to
downstream properties. Post -development runoff calculations show that peak runoff at
the point of study will be less than existing conditions.
Attestation
Provide attestation to the accuracy and completeness of the foregoing 6 Parts of this Technical
Design Summary Drainage Report by signing and sealing below.
`This report (plan) for the drainage design of the development named in Part B was prepared
by me (or under my supervision) in accordance with provisions of the Bryan/College Station
Unified Drainage Design Guidelines for the owners of the property. All licenses and permits
required by any and all state and federal regulatory agencies for the proposed drainage
improv an hav been issued r fall under applicable general permits
(Affix Seal)/may;: so:�F;\\�
,m
censedProfessionalEn rn er '• •••••••• O•.IR
•J. DALE BROWNE, JR.
State of Texas PE No. gJ a / �' q90 • 981890 •;Q�
STORMWATER DESIGN GUIDELINES Page 26 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
"- Effective February 2007 As Revised February 2009