HomeMy WebLinkAboutTechnical Design SummaryAPPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept ano
Design Parameters
Continued (Page 4.17)
Design
Parameters (continued)
Computer Software
What computer software has been use
management needs and/or the develor
project? List them below, being sure to
version, any applicable patches and th
V v \
in the analysis and assessment of stotmwater
ment of facility designs proposed for subject property
identify the software name and version, the date of the
publisher
Part 6 — Plans and Specifications
Requirements for submittal of construc
Technical Design Summary Report. S
ion drawings and specifications do not differ due to use of a
e Section III, Paragraph C3.
Part 6 — Conclusions and Attestation
Conclusions
Add any concluding information here:
i
i
I
I
i
i
Attestation
Provide attestation to the accuracy and
Summary Drainage Report by
completeness of the foregoing 6 Parts of this Technical
signing and sealing below.
-Design
"This report (plan) for the drainage design
by me (or under my supervision) in accordance
Unified Drainage Design Guidelines for
required by any and all state and federal
improvements have been issued or fall
of the development named in Part B was prepared
with provisions of the Bryan/College Station
the owners of the property. All licenses and permits
regulatory agencies for the proposed drainage
under applicable general per - "
SE OF t-
(Affix Se g4;.aeeeees
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STORMWATER DESIGN GUIDELINES Page 26 of 26 APPENDIX, D: TECH. DESIGN SUMMARY
Effective February 2007 As Revised August 2012
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Desi n 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? � No _ Yes Head and frifction losses is No
—Yes
Explain any "yes" answer:
In conduit is velocity generally increased in the downstream direction? No
_Yes _
Are elevation drops provided at inlets, manholes, and jurjction boxes? X Yes _ No
Explain any "no" answers: 7
i
i
Are hydraulic grade lines calculated and shown for design storm? x Yes No
_
For 100-year flow conditions? Yes _ No Explain any "no" answers:
i
What tailwater conditions were assumed at outfall point(s) of the storm drain system? Identify
each location and explain:
I
Open Channels If a HEC analysis is utilized, does it follow Sec VI.F.5.a? _ Yes _ No
Outside of straight sections, is flow regime within limits of,sub-critical flow? Yes No
_ _
If "no" list locations and explain:
i
Culverts If plan sheets do not provide the following for each culvert, describe it here.
For each design discharge, will operation be outlet (barrel) control or inlet control?
I
i
I
i
Entrance, friction and exit losses:
Pt i
5
Bridges tde etLin br{dge:fep6rt
STORMWATER DESIGN GUIDELINES Page 25 of 26
Effective February 2007
'H. DESIGN SUMMARY
As Revised August 2012
APPENDIX D - TECHNICAL DESIGN SU
Part 4 - Drainage Concept andl
Design Parameters
Continued (Page 4.15)
Desigrt'Parameters
(continued)
Hydrology (continued)
In making determinations for time of
_ No .4,_ Yes In approximately
concentration, was segment analysis used?
what percent of Design Drainage Areas? O %
As to intensity -duration -frequency and
criteria other than those provided ir!
identify type of data, source(s), and
rain depth criteria for determining runoff flows, were any
these Guidelines used? )6 No _Yes If "yes"
where applied:
For each of the stormwater manag
frequencies (year) analyzed (or ch
ment features listed below identify the storm return
cked), and that used as the basis for design.
Feature
I
Analysis Year(s)
Design Year
Storm drain system for arterial andlcollector
streets
Storm drain system for local street
O
O c�
Open channels
Swale/buried conduit combination i�
lieu of channel
Swales
Roadside ditches and culverts serving
them
Detention facilities: spillway crest
and its outfall
Detention facilities: outlet and conyleyance
structure(s)
Detention facilities: volume when o
tlet plugged
Culverts serving private drives or streets
Z
(�
Culverts serving public roadways
Bridges: provide in bridge report.
Hydraulics
What is the range of design flow vE
locities as outlined below?
Design flow velocities;
Gutters
Conduit
Culverts
Swales
Channels
Highest (feet per second)
Lowest (feet per second)
I 2.5�Z-
�( 3
Streets and Storm Drain Systems
Provide the summary information outlined below:
Roughness coefficients used:
For conduit type(s) l-c-P
For street gutters: Q O l6
Coefficients: 0,0 l3
STORMWATER DESIGN GUIDELINES I Page 24 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 1 As Revised August 2012
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)
In table below briefly identify specific element, justification for deviation(s).
Specific Detail Element
Justification for Deviation (attach additional sheets if needed)
1) 6tOt:- 5 OF-
tSG- -mar l v&. Uc.
2)
i
3)
I
4)
5)
(
Have elements been coordinated with the City Engineer or her/his designee? For each item
above provide "yes" or "no", action date, and staff name:
1) I
2
3)
4)
i
5)
Design Parameters;
Hydrology
Is a map(s) showing all Design Drainage Areas provided? Yes No
Briefly summarize the range of applications made of the Rational Formula:
i
i
I
I
What is the size and location of largest Design Drainage Area to which the Rational Formula
has been applied? —<3_ acres Location (or identifier):
STORMWATER DESIG
Effective February 2007
Page 23 of 26
D: TECH. DESIGN SUMMARY
As Revised August 2012
DIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and
Design Parameters
Continued (Page 4.13)
Stormwater M
. nagement Concept (continued)
Within Or Serving Subject Property (f2hase,
or Site) (continued)
Is a bridge included in plans
for subject property project? _ No _ Yes
If "yes" provide the following
information.
Name(s) and functional cla
sification of the roadway(s)?
What drainage is to
be crossed?
way(s)
rn
v
m`
A full report supporting all aspects
of the proposed bridge(s) (structural, geotechnical,
hydrologic, and hydraulic factors)
must accompany this summary report. Is the report
provided? —Yes
I No If "no" explain:
I'
Is a Stormwater
Pr
Dvide a general description of planned techniques:
Z;
Pollution Prevention
.=
Plan (SW3P)
d
established for
project construction?
No 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?
No —Yes If "yes" list general
type and location below.
Provide full report about the proposed
special design(s) including rationale for use and
expected benefits. Report must sribstantiate
that stormwater management objectives will not -
be compromised, and that maintenance
cost will not exceed those of traditional design
solution(s). Is report provided?
Yes No If "no' explain:
i
STORMWATER DESIGN GUIDELINES I Page 22 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 2007 1 As Revised August 2012
APPENDIX D —
DESIGN SUMMARY
Part 4 — Drainage Concept and Desi n Parame
ers
Continued (Page 4.12)
Stormwater Management Conc
pt (continued)
Within Or Serving Subject Property (Phase, or Site) (con
inued)
All Proposed Culverts: For all proposed culvert
facilities (except driveway/roadside
ditch intersects) provide information requested ir
next eight boxes.
Do culverts and travelways intersect at 90 degre
s? _Yes No If not,
identify location(s) and intersect angle(s), and justify
the design(s):
Does drainage way alignment change within or rearlimits
of culvert and surfaced
approaches thereto? No _ Yes If "y
s" identify location(s), describe
change(s), and justification:
Are flumes or conduit to discharge into culvert b
rrel(s)? _ No _ Yes If yes,
identify location(s) and provide justification:
Are flumes or conduit to discharge into or near s
rfaced approaches to culvert ends?
No _ Yes If "yes' identify location(s)
describe outfall design treatment(s):
c
c
0
U
N
>
is scour/erosion protection provided to ensure lor
ig term stability of culvert structural
tj
components, and surfacing at culvert ends?
Yes _ No If "no" Identify
locations and provide justification(s):
Will 100-yr flow and spread of backwater be fully
contained in street ROW, and/or
drainage easements/ ROW? _ Yes _ Kl
if not, why not?
i
Do appreciable hydraulic effects of any culvert extend
downstream or upstream to
neighboring land(s) not encompassed in subject
"yes"
property? No Yes If
describe location(s) and mitigation measures:
Are all culvert designs and materials in compliance
with B-CS Tech. Specifications?
Yes _ No If not, explain in Special D
sign Section of this Part.
Page 21 of 26
Effective February 2007
�H. DESIGN SUMMARY
As Revised August 2012
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Draina a Conce t an
Desi n Parameters
Continued (Page 4.11)
Stormwater III
anagement Concept (continued)
Within Or Serving Subject Property
Phase, or Site) (continued)
Named ReoulatoryWate
courses & Tribu ries : Are culverts proposed on these
facilities? No
Yes, then provide full report documenting assumptions,
_
criteria, analysis, compute
programs, and study findings that support proposed
design(s). Is report provided?
_Yes _ No If "no", explain:
Arterial or Ma'or Collectc
r Streets: Will culverts serve these types of roadways?
Yes Flow
NNo
many instances? For each identify the
m
location and provide the information
below.
Qo)
Instance 1:
Y
a
Instance 2:
Instance 3:
c
0
o
Yes or No for the 100-yea
design flow:
1
2
3
z
E
o
Headwater WSE 1 foot be]
w lowest curb top?
Spread of headwater within
ROW or easement?
N
Is velocity limited per cond
tions (Table C-11)?
N m
Explain any "no" answer(s):
N
O CO
U w,
O
o �
Minor Collector or LocalStreets:
Will culverts serve these types of streets?
No Yes
How many instances? for each identify the
location and provide the in
ormation below:
o. a>
n
Instance 1:
Nc
Instance 2:
m o
Instance 3:
N
i
For each instance enter v
lue, or "yes!'/ "no" for:
1
2
3
U N
o v
Design yr. headwater WSE
1 ft. below curb top?
Q E)
100-yr. max. depth at streE
it crown 2 feet or less?
E
Product of velocity (fps) &
depth at crown (ft) = ?
o
Is velocity limited per conditions
(Table C-11)?
Limit of down stream analysis
(feet)?
Explain any "no" answers:
NES I Page 20 of 26 APPENDIX. D:
Effective February 2007
As Revised August 2012
4P�
NfN
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Draina a Concei3t and Design Paramet
rs
Continued (Page 4.10)
Stormwater Management Concept
(continued)
Within Or Serving Subject Property (Phase, or Site) (coni
inued)
Do structures comply with B-CS Specifications?
Yes or no, and explain if "no":
Facility 1;
m
LL
Facility 2:
c -
o c
.= o
aGi
o
For additional facilities provide all same information
on a separate sheet.
Are parking areas to be used for detention?
No What is
maximum depth due to required design storm?
—Yes
Roadside Ditches: Will culverts serve access drveways
at roadside ditches?
_ No � Yes If "yes", provide informatior)
in next two boxes.
Will 25-yr. flow pass without flowing over driveway
in all cases? K Yes No
Without causing flowing or standing water on pudic
_
roadway? Yes _ No
Designs & materials comply with B-CS Technical
Specifications? X Yes _ No
Explain any "no" answers:
C1.
rn
c
o
Are culverts parallel to public roadway alignment
Yes _ No Explain:
u �
nlvl
Creeks at Private Drives: Do private driveways
drives, or streets cross drainage
m
ways that serve Above -Project areas or are in pu
lic easements/ ROW?
N z
No _ Yes If "yes" provide informat
on below.
How many instances? Describe locatioi
and provide information below.
>
Location 1:
0
2
Location 2:
Location 3:
For each location enter value for:
1
2
3
Design year passing without toping travelway?
Water depth on travelway at 25-year flow?
Water depth on travelway at 100-year flow?
For more instances describe location and same information
on separate sheet.
Effective February 2007
Page 19 of 26
As Revised August 2012
APPEI4DIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and
Desi n Parameters
Continued (Page 4.9)
Stormwater Management
Concept (continued)
Within Or Serving Subject Property (Phase,
or Site) (continued)
How many facilities for sub
ect property project? For each provide info. below.
For each dry -type facilitiy:
Facility 1
Facility 2
Acres served & design Volume
+ 10%
100-yr volume: free flow &
plugged
Design discharge (10 yr &
5 yr)
Spillway crest at 100-yr W
E?
—yes no
yes no
Berms 6 inches above plu
ged WSE?
_yes —no
_ yes _ no
Explain any "no" answers:
For each facility what is 25
yr design Q, and design of outlet structure?
Facility 1:
0
z
Facility 2:
Do outlets and spillways di
3charge into a public facility in easement or ROW?
Facility 1: —Yes
No Facility 2: —Yes —No
If "no" explain:
0
O
O.
O
a.
For each, what is velocity c
if 25-yr design discharge at outlet? & at spillway?
Facility 1: &
Facility 2: &
Are energy dissipation measures
used? No —Yes Describe type and
u_
location:
c
0
d
d
For each, is spillway surface
treatment other than concrete? Yes or no, and describe:
Q
Facility 1:
Facility 2:
For each, what measures
re taken to prevent erosion or scour at receiving facility?
Facility 1:
Facility 2:
If berms are used give hei
hts, slopes and surface treatments of sides.
Facility 1:
Facility 2:
STORMWATER DESIGI
Effective February 2007
18 of 48 AVFLNUTA. U: I CUH. ULNUN JUMNIAKY
As Revised August 2012
CTION
APPENDIX D -
DESIGN SUMMARY
Part 4 — Drainage Conce t and Desicin Parameters
Continued (Page 4.8)
Stormwater Management Concept
(continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Existing channels (small creeks): Are theseused?
No Yes
If "yes" provide the information below.
_ _
Will small creeks and their floodplains remain undisturbed?
Yes No How
many disturbance instances? Identify
each planned location:
For each location, describe length and general t
pe of proposed improvement
(including floodplain changes):
For each location, describe section shape & area,
flow line slope (min. & max.),
surfaces, and 100-year design flow.
a
c
oWatercourses
(and tributaries): Aside from fri
ge changes, are Regulatory
Watercourses proposed to be altered? N
Yes Explain below.
N
_
_
Submit full report describing proposed changes to
Regulatory Watercourses. Address
E
existing and proposed section size and shape, SL
rfaces, alignment, flow line changes,
>
length affected, and capacity, and provide full documentation
of analysis procedures
and data. Is full report submitted? Yes
No If "no" explain:
a
E
—
c
C
vAll
Proposed Channel Work: For all proposed
hannel work, provide information
requested in next three boxes.
If design is to replicate natural channel, identify Ic
cation and length here, and describe
design in Special Design section of this Part of Report.
Will 100-year flow be contained with one foot of f
eeboard7 if
not, identify location and explain:
—Yes —No
Are ROW / easements sized to contain channel e
nd required maintenance space?
Yes —No If not, identify location(s) ar
d explain:
STORMWATER DESIGN GUIDELINES Page 17 of 26
Effective February 2007
TECH. DESIGN SUMMARY
As Revised August 2012
APPE DIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Draina a Concept an
Desi n Parameters
Continued (Page 4.7)
Stormwater R
anagement Concept (continued)
Within Or Serving Subject Property
Phase, or Site) (continued)
If "yes" provide the following
information for each instance:
Instance 1 Describe gen
)ral location, approximate length, surfacing:
c
a
o
Lu
Is 100-year design flow co
tained in swale? Yes _ No Is swale wholly
j
within drainage ROW?
Yes _ No Explain "no" answers:
Access Describe how ma
ntenance access is provide:
o
�z
a
cX
U
Instance 2 Describe general
location, approximate length, surfacing:
,a
Q)
c c�
oo E
L N
Is 100-year design flow contained
in Swale? —Yes —No Is swale wholly
`o
within drainage ROW?
Yes _ No Explain "no" answers:
w
X
Access Describe how ma
ntenance access is provided:
0
a
a
Instance 3. 4, etc. If swa
as are used in more than two instances, attach sheet
providing all above informe
tion for each instance.
"New" channels: Will any
area(s) of concentrated flow be channelized (deepened,
widened, or straightened)
or otherwise altered? No Yes If only slightly
shaped, see "Swales" in th
s Part. If creating side banks, provide information below.
c
Will design replicate natur
I channel? _ Yes _ No If "no", for each instance
$ a
describe section shape &
rea, flow line slope (min. & max.), surfaces, and 100-year
o w
design flow, and amount o
freeboard:
Instance 1:
N �
r
E
o
Instance 2:
a
E o
z
C Y
Instance 3:
m
L
U
STORMWATER DESIGN
Effective February 2007
AP CNUIX. U: I tUN. UtJIIiN JUNIIVIAKr
As Revised August 2012
APPENDIX D — TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept and Desi n Paramet
rs
Continued (Page 4.6)
Stormwater Management Concept
(continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Are roadside ditches used? _ No
es If so, provide the following:
cis
25-year flow contained with 6 inches of freeboiard
throughout ? _Yes _ No
Are top of banks separated from road shoulders
2 feet or more? Yes No
Are all ditch sections trapezoidal and at least 1.5
_ _
feet deep? _ Yes No
Z
For any "no" answers provide location(s) and exr
lain:
10
0
If conduit is beneath a swale, provide the followir
g information (each instance).
Instance 1 Describe general location, approximate
length:
N
N
>-
Is 100-year design flow contained in conduit/swa
a combination? No
"no" explain:
_Yes
UIf
0 N
Space for 100-year storm flow? ROW _ E
sement _ Width
.c
Swale Surface type, minimum
Conduit Type
and size, minimum and maximum
and maximum slopes:
slopes, design
storm:
0
N �
c m
Inlets Describe how conduit is loaded (from stre
—
is/storm drains, inlets by type):
c
�
.c
U 0
c _o
Access Describe how maintenance access is pr
vided (to swale, into conduit):
0 10
(D�
(D o
c
Instance 2 Describe general location, approximate
length:
d) (D
N N
3
c v
Is 100-year design flow contained in conduit/swal
combination? Yes No
g '
2
If "no" explain:
c
0)
Space for 100-year storm flow? ROW Easement
Width
o
_
o
Swale Surface type, minimum
Conduit Type
and size, minimum and maximum
m
and maximum slopes:
I
slopes, design
storm:
oo
a� W
Inlets Describe how conduit is loaded (from stre
is/storm drains, inlets by type):
m �
3 0
QAccess
Describe how maintenance access is provided
(to swale, into conduit):
Effective February 2007
Page 15 of 26
TECH. DESIGN SUMMARY
As Revised August 2012
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 4 — Drainage Concept an
Design Parameters
Continued (Page 4.5)
Stormwater IN
lanagement Concept (continued)
Within Or Serving Subject Property
Phase, or Site) (continued)
Describe watercours
(s), or system(s) receiving system discharge(s) below
W
(include design discl
iarge velocity, and angle between converging flow lines).
U
1) Watercourse (orsystem),
velocity, and angle?
7 35' Fps
� moo"
0
E
2) Watercourse (or
system), velocity, and angle?
�o
c ,�
c d
U _C
°'
E
m E
3) Watercourse (or
stem), velocity, and angle?
T N
w
(D
O
� O
'n a
E
For each outfall above,
what measures are taken to prevent erosion or scour of
g` t
receiving and all faciities
at juncture?
CO
m
a
a�
2)
N
0
3)
Are swale(s) situated alon
property lines between properties? No _ Yes
Number of instances:
For each instance answer the following questions.
Surface treatments (includ
ng low -flow flumes if any):
o-
ti
C
Flow line slopes (minimum
and maximum):
O
N O
Z
v�
3
Outfall characteristics forEach
(velocity, convergent angle, & end treatment).
d
¢`
Will 100-year design storrr
runoff be contained within easement(s) or platted drainage
ROW in all instances?
Yes —No If "no" explain:
STORMWATER DESIGI
Effective February 2007
;H. UE51GN SUMMAKY
As Revised August 2012
APPENDIX D -
DESIGN SUMMARY
Part 4 — Drainage Concept and Desi n Parameters
Continued (Page 4.4)
Stormwater Management Concept
(continued)
Within Or Serving Subject Property (Phase, or Site) (continued)
Gutter line slopes: Least O •-75� Usual
O.?%`, Greatest I
Are inlets recessed on arterial and collector stre
ts? Yes No If "no',
identify where and why. N/C
Will inlets capture 10-year design stormflow to prevent
flooding of intersections (arterial
with arterial or collector)? Yes _ No
If no, explain where and why not.
v
N%0
Will inlet size and placement prevent exceeding i
illowable water spread for 10-year
design storm throughout site (or phase)?
Yes No If no, explain.
m
Sac curves: Are inlets placed at low points?
Yes No Are inlets and
conduit sized to prevent 100-year stormflow from
_
ponding at greater than 24 inches?
t o
Yes _ No Explain "no" answers.
0
a�
N
a)
Will 100-yr stormflow be contained in combination
of ROW and buried conduit on
whole length of all streets? Y,_ Yes
o If no, describe where and why.
Do designs for curb, gutter, and inlets comply wit
i B-CS Technical Specifications?
X Yes No If not, describe differ
nce(s) and attach justification.
Are any 12-inch laterals used? �No
Yes Identify length(s) and where
used.
NN
Pipe runs between system
Typical N by
Longest �53
a)access
points (feet):
EAre
junction boxes used at each bend? _
as No If not, explain where
N
and why.
c
� o
z
E
E
Uuo,
Are dov nstrearn soffits at or below upstream soff
ts?
Least amount that hydraulic
N
Yes 7,. No _ If not, explain where and
why:
grade line is below gutter line
(system -wide):
z.s1
NES
Effective February 2007
Page 13 of 26
CH. DESIGN SUMMARY
As Revised August 2012
N
D — TECHNICAL DESIGN SUMMARY
Part 4 — Draina a Conce t an
Design Parameters
Continued (Page 4.3)
Stormwater 0anagernent
Concept (continued)
Within Project Area Of Multi -Phase F
Iroject (continued)
Will Project Area include bridge(s)
r culvert(s)? No _ Yes Identify type and
general size and In which phase(s)
If detention/retention serves (willserve)
overall Project Area, describe how it relates to subject
phase or site project (physical loca
ion, conveyance pathway(s), construction sequence):
Within Or Serving Subject Property
Phase, or Site)
If property part of larger Project Ar
a, is design in substantial conformance with earlier analysis
and report for larger area?
es No, then summarize the difference(s):
Identify whether each of the types
of drainage features listed below are included, extent of use,
and general characteristics.
Typical shape?
Surfaces?
0
a
jm
Steepest side slopes:
Usual front slopes:
Usual back slopes:
( >
w
Flow line slopes: leasi
Typical distance from travelway:
typical greatest
(Attached Exhibit # )
o
z
-0
o
Are longitudinal culve
ends in compliance with B-CS Standard Specifications?
Yes
o, then explain:
At intersections or oth
rwise, do valley gutters cross arterial or collector streets?
C', }
No Y
s If yes explain:
(
r NIV
Are valley gutters proposed
to cross any street away from an intersection?
or
No
(number of locations?)
Z
_,& _YesExplain:
N c
v �
STORMWATER DESIG
Effective February 2007
As Revised August 2012
0
APPENDIX D —
DESIGN SUMMARY
Part 4 — Drainage Concept and Design Parameters
Continued (Page 4.2)
Stormwater Management Concept
(continued)
Within Project Area Of Multi -Phase Project
Identify gaining Basins or Watersheds
and acres shifting:
Will project result
in shifting runoff
between Basins or
between
What design and mitigation is used to
compensate for increased runoff
Watersheds?
from gaining basin or watershed?
No
Yes
How will runoff from Project
1. _ With facility(ies) involving
other development projects.
Area be mitigated to pre -
development conditions?
2 Establishing feat
g
to serve overall Project Area.
�
(
Select any or all of 1, 2,
3. _ On phase (or sit)
project basis within Project Area.
and/or 3, and explain below.
1. Shared facility (type & location of facility; design drainage
e area served; relationship to size of
Project Area): (Attached Exhibit #_)
2. For Overall Proiect Area (type & location of facilities): (Attached
Exhibit #)
3. By phase (or site) proiect: Describe planned mitigation'
measures for phases (or sites) in
subsequent questions of this Part.
Are aquatic echosystems proposed? No
_ Yes In which phase(s) or
project(s)?
a
a a)
>I
Are other Best Management Practices for reducir
g stormwater pollutants proposed?
0-
No Yes Summarize type of BM
and extent of use:
c
rn
°' 0
0 Z
design of any runoff -handling facilities deviate f
m provisions of B-CS Technical
IIf
Specifications, check type facility(ies) and explai
In later questions.
rn
)
_ Detention elements Conduit elem
ants Channel features
Swales —Ditches— Inlets --Valley
_
gutters _ Outfalls
Culvertfeatures —Bridges
Other
STORMWATER DESIGN GUI
Effective February 2007
U: I EUH. UtSIGN SUMMARY
As Revised August 2012
SECTION IX
APPENDIX
D -TECHNICAL DESIGN SUMMARY
Part 4 — Draina a Concept and
Desi n Parameters
Start (Page 4.1)
Stormw
ter Management Concept
Discharge(s) From Upland Area(s)
If runoff is to be received from upla
d areas, what design drainage features will be used to
accommodate it and insure it is not
blocked by future development? Describe for each area,
flow section, or discharge point.
C2il�sJ`f.
Discharge(s) To Lower Property(ies)
(Section II, Paragraph E1)
Does project include drainage features
(existing or future) proposed to become public via
platting? _No _�C_ Yes
Separate Instrument? No Yes
Per Guidelines reference above, how
will
i�
E �tlTfg Easements (Scenar o 1)
runoff be discharged to neighboring
Pre -development Release (Scenario 2)
property(ies)?_
Combination of the two Scenarios
Scenario 1: If easements are prop
sed, describe where needed, and provide status of actions
on each. (Attached Exhibit #
)
Scenario 2: Provide general descr
ption of how release(s) will be managed to pre -development
conditions (detention, sheet flow, partially
concentrated, etc.). (Attached Exhibit #_)
Combination: If combination is proposed,
explain how discharge will differ from pre -
development conditions at the property
`b,ScrlRazc-cam
line for each area (or point) of release.
D\vac-
a_H -tom { W OF -
If Scenario 2, or Combination are W
be used, has proposed design been coordinated with
owner(s) of receiving property(ies)
No _ Yes Explain and provide
documentation.
STORMWATER DESIGN GUIDELINES Page 10 of 26 APPENDIX. D: TECH. DESIGN SUMMARY
Effective February 20, As Revised August 2012
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 3 — Property Characteristics
Continued (Page 3.4)
Hydrologic Attributes of Subject Prope
(or Phase) (continued)
Conveyance Pathways (continued)
Do drainage
if yes, for what part of length?
% Created by? plat, or
easements
instrument. If instrument(s), describe
_
their provisions.
exist for any
part of
pathway(s)?
_ No
Yes
Where runoff must cross lower properties, descri
a characteristics of abutting lower
property(ies). (Existing watercourses? Easement
or Consent aquired?)
Pathway
Areas
Describe any built or improved drainage facilities
existing near the property (culverts,
bridges, lined channels, buried conduit, swales, c
etention ponds, etc).
Nearby
Drainage
Facilities
Do any of these have hydrologic or hydraulic infl
ence on proposed stormwater
design? No —Yes If yes, explai
:
I v/k
DIX D — TECHNICAL DESIGN SUMMARY
Part 3 — Property Characterist*
s
Continued (Page 3.3)
Hydrologic Attributes Of
Subject Property (or Phase) (continued)
Does subject property straddle a Watershed
describe splits below. In Part 4 deE
or Basin divide? No _ Yes If yes,
cribs design concept for handling this.
Watershed or Basin
Larger acreage
Lesser acreage
Above -Project Areas(Section 11, Paragraph
B3-a)
Does Project Area (project or phase)
Size(s) of area(s) in acres: 1)
receive runoff from upland areas? _ No _ Yes
2) 3) 4)
Flow Characteristics each instan
a (overland sheet, shallow concentrated, recognizable
(non -regulatory), regulatory Watercourse or tributary);
concentrated section(s), small creak
Flow determination: Outline hydrologic
methods and assumptions:
Does storm runoff drain from public
No _ Yes If yes,
easements or ROW onto or across subject property?
ascribe facilities in easement or ROW:
Are changes in runoff characterist
cs subject to change in future? Explain
Conveyance Pathways (Section II, PE
ragraph C2)
Must runoff from study property drain
Watercourse or tributary?
across lower properties before reaching a Regulatory
_ No Yes
Describe length and characteristics
property(ies).
of each conveyance pathway(s). Include ownership of
STORMWATER DESIGN GUIDELINES Page S of 26 APPENDIX. D: TE(:H. DESIGN SUMMARY
Effective February 20, As Revised August 2012
0
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?
Yes
Reference the study (& date) here, and attach copy i
not already in City files.
_-
-Z� F -s I .I t2
H + )} , --C'RA f��> C
Is the stormwater management plan for the property
n substantial conformance with the
earlier study? Yes No If not, explain
how it differs.
U13/4N_
No
If subject property is not part of multi -phase project,
describe stormwater management
plan for the property in Part 4.
If property is part of multi -phase project, provide oveiview
of stormwater management plan
for Project Area here. In Part 4 describe how plan for
subject 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? =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)
Detention is required. Need must be evaluate
_ Detention not required.
What decision has been reached? By
whom?
If the need for
How was determination made?
Type 1 Detention
must be evaluated:
Effective February 2007
Page 7 of 26
D: TECH. DESIGN SUMMARY
As Revised August 2012
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?
NAP -
Site
A Redeve�lo me
t of one platted lot, or two or more adjoining platted lots.
Development
Building on as
ngle platted lot of undeveloped land.
Project
Building on two
or more Ip atted 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 (t
ut may include ROW dedication to existing streets).
Other (explain):
Subdivision
— Construction oI
streets and utilities to serve one or more platted lots.
Development
Construction of
streets and utilities to serve one or more proposed lots on
Project
_
lands represented
by pending plats.
Site projects: building
se(s), approximate floor space, impervious cover ratio.
Describe
Subdivisions: number
f lots by general type of use, linear feet of streets and
Nature and
drainage easements or
ROW.
Size of
Proposed
Project
Is any work planned on land that is not
platted
if yes, explain:
or on land for which platting is not pen
inq _g?
X No Yes
,EMA Floodplains
Is any part of subject property abutting
a Named Regulatory Watercourse
No Yes
(Section II, Paragraph B1) or a tribute
thereof?
Is any part of subject property in floodpiain
No Yes Rate Map 215E
area of a FEMA-regulated watercourse?
—
Encroachment(s)
into Floodplain
Encroachment put
put
ose(s): 7C Building site(s) _ Road crossing(s)
areas planned?
Utility cross
— Other (explain):
No _
Yes _
If floodpiain areas not shown on Rate lylaps,
has work been done toward amending the FEMA-
approved Flood Study to define allowajlI�le�
encroachments in propo ed a eas? Explain.
UPSGt°t Twn ri- tDoc> �(s�1
— nf"Clc� � INU-p\2
STORMWATER DESIGN GUIDELINES Page 6
Effective February 2007
;H. DESIGN SUMMAKY
As Revised August 2012
APPENDIX D - TECHNICAL DESIGN SUMMARY
Part 2 — Project Administration
Continued (page 2.3)
Coordination For Project or Subject F
roperty (or Phase)
Note: For any Coordination of stormwater matters indicated
below, attach documentation
describing and substantiating any agreements, understandings,
contracts, or approvals.
Coordination
Dept.
Contact:
Date:
Subject:
With Other
Tkmik
'S2vtF V.j\-t
Departments of
Jurisdiction
City (Bryan or
College Station)
Coordination With
Summarize need(s) & actions taken (i
clude contacts & dates):
Non -jurisdiction
City Needed?
Yes _ No
Coordination with
Summarize need(s) & actions taken (i
n clude contacts & dates):
Brazos County
Needed?
Yes _ No iC
Coordination with
Summarize need(s) & actions taken (include
contacts & dates):
TxDOT Needed?
t)(ZWIV,�PH 'FtW-y / IT
Yes ✓ No _
f Gri �'G0%TT
cOI,Ley.-F�
Coordination with
Summarize need(s) & actions taken (include
contacts & dates):
TAMUS Needed?
Yes No
Permits For Project or Subject Pro
erty (or Phase)
As to stormwater management, are permits required for the p
oposed 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)
Approved ?
US Army Crops of
Engineers
No Yes _
US Environmental
�p�Vv11�
Protection Agency
V/'
No Yes '
Texas Commission on
U Ct I-1-CH
or.1S-t (L�c -r�oeJ
Environmental Quality
No- Yeses
Brazos River
Authority
No X Yes
DELINES Page 5 of 26
Effective February 2007
Fol
As Revised August 2012
DIX D - TECHNICAL DESIGN SUMMARY
Part 2 — Pro'ect Administration
Continued (page 2.2)
Project
Identification (continued)
Roadways abutting or within Project Area
subject property:
Cass I tts iA.a , � u s
or
G
Abutting tracts, platted land, or built
developments:
CuLPFePF-JC
Named Regulatory Watercourse(s) & V
-(� ra c • � - (b�e.-r��v
atershed(s):
2.�c
Tributary Basin(s):
Plat Information For'Project
or Subject Property (or Phase)
Preliminary Plat File #:
Name:
Final Plat File #: Date:
I Status and Vol/Pg:
If two plats, second name:
Status:
File #:
Date:
Zoning Information Fc
r Project or Subject Property (or Phase)
Zoning Type: Exist
Case Date Status:
ng or Proposed? Case Code:
Zoning Type: Exist
Case Date Status:
ng or Proposed? Case Code:
Stormwater Management Plar
ping For Project or Subject Property (or Phase)
Planning Conference(s) & Date(s):
Participants:
Preliminary Report Required?
Submittal Date Review Date
Review Comments Addressed? Yes
No _ In Writing? When?
Compliance With Preliminary Drainage
explaining) any deviation(s) from provisions
Report. Briefly describe (or attach documentation
of Preliminary Drainage Report, if any.
STORMWATER DESIGI
Effective February 2007
;H. DESIGN SUMMARY
As Revised August 2012
APPENDIX D —
DESIGN SUMMARY
Part 2 - Project Administration
Start (Page 2.1)
Engineering and Design Professionals
Information
Engineering Firm Name and Address:
Jurisdiction
1�zme
City: Bryan
O• 13oX 9,z5
College Station
CoLLF car= `jAZ tojl —
Date of Submittal: 7 sIZZIt�
Lead Engineer's Name and Contact Info.(Phone, e-mail, fax)
Other:
lzb'ot'� A" Me;'7 CA, k1=, PF..
Supporting Engineering / Consulting Firm(s):
Oth
r contacts:
Developer / Owner / Applicant
Information
Developer / Applicant Name and A dress:
Phone and e-mail:
A fAF,Ax c�.1 LNryvPuS Cczmyvvww i—C I �.S
C S(Z� 7w -\ o0�
700 4- L. Covnrceq Sum r 7-Zoo
i G-r c fL e
--Tx 0 3la
PfrA9�f CA4,.�CP,t 9,Z,Cc WA
Property Owners if not Developer / Applicant (& address):
-I�tiMuS ot1w C3. Caa�lwht,ti�t �•D�-
phone and e-mail:
lg7'l)�tse-c�t2o
Project Identification\
Development Name: T�rMk_k 60ao COLL zTF
QuEtC1 uS\Nia
Is subject property a site project, a single-phase subdivision,
or part of a muiti-phase subdivision?
N C, t L hrb�Fi. &-T2- if multi -phase, subject
property is phase of
Legal description of subject property (phase) or Project Area:
(see Section ll, Paragraph B-3a)
t � TsCAA�r_ t—C�aw� J C..l;C.7pJt�
vJlStotJ
If subject property (phase) is second or later phase of a project,
describe general status of all
earlier phases. For most recent earlier phase Include submittal
and review dates.
General Location of Project Area, or subject property (phase:
In City Limits?
Extraterritorial Jurisdiction
(acreage):
Bryan: acres.
Bryan:
College Station:
College Station: 13 - `eZ'6 acres.
Acreage Outside
TJ:
STORMWATER DESIGN GUIDELINES Page 3 of 26
Effective February 2007
FBI
As Revised Auaust 2012