HomeMy WebLinkAbout6 Jim Stucky State Farm 05-02 242 Southwest Parkway E (2)CITY OF COLLEGE STATION
Planning & Development &rvius
SITE LEGAL DESCRIPTION:
Ashford Square Addition
Lot 88
DATE OF ISSUE: 02/10/05
OWNER:
Jim Stuckey
4332 Roans Chapel Road
College Station , Texas 77845
TYPE OF DEVELOPMENT:
SPECIAL CONDITIONS:
DEVELOPMENT PERMIT
PERMIT NO. 05-02
FOR AREAS OUTSIDE THE SPECIAL FLOOD HAZARD AREA
RE: CHAPTER 13 OF THE COLLEGE STATION CITY CODE
SITE ADDRESS:
242 Southwest Parkway
DRAINAGE BASIN:
Main Bee Creek
VALID FOR 12 MONTHS
CONTRACTOR:
Full Development Permit
All construction must be in compliance with the approved construction plans
All trees required to be protected as part of the landscape plan must be completely barricaded in accordance with Section
7.5.E ., Landscape/Streetscape Plan Requirements of the C ity's Unified Development Ordinance , prior to any operations of
this permit. The cleaning of equipment or materials within the drip line of any tree or group of trees tha t are protected and
requ ired to rema in is strictly prohibited. The disposal of any waste material such as , but not lim ited to , paint, oil, solvents ,
asphalt , concrete , mortar, or other harmful liquids or materials within the drip line of any tree requ ired to rema in is also
proh ibited .
TCEQ PHASE II RULES INEFFECT
The Contractor shall take all necessary precautions to prevent silt and debris from leaving the immediate construct ion site
in accordance w ith the approved erosion control plan as well as the City of College Station Drainage Policy and Design
Criteria. If it is determined the prescribed erosion control measures are ineffective to reta in all sediment onsite , it is the
contractors responsibility to implement measures that will meet City, State and Federal requirements. The Owner and/or
Contractor shall assure that all disturbed areas are sodden and establ ishment of vegetation occurs prior to removal of any
silt fencing or hay bales used for temporary erosion control. The Owner and/or Contractor shall also insure that any
disturbed vegetat ion be returned to its or iginal condition , placement and state. The Owner and/or Contractor shall be
responsible for any damage to adjacent properties, city streets or infrastructure due to heavy machinery and/or equ ipmen t
as well as erosion , siltation or sedimentation resulting from the permitted work .
In accordance w ith Chapter 13 of the Code of Ordinances of the City of College Station, measures shall be taken to insure
that debris from construction , erosion , and sedimentation shall not be depos ited in city streets , or existing drainage
facilit ies .
I hereby grant t his perm it for development of an area outside the special flood hazard area . All development shall be in
accordance with the plans and specifications submitted to and approved by the City Engineer in the development perm it
appl ication for the above named project and all of the codes and ordinances of the City of College Station that apply.
Date
cri ~·J fl>'' r FOR OFFICE USE ONLY
P&Z CASE NO.: 0'50~
DATE SUBMITTED: /-/0 -0 5
SITE PLAN APPLICATION
MINIMUM SUBMITTAL REQUIREMENTS
v'
, Site plan application completed in full. 3 $200 .00 Application Fee.
~$200.00 Development Permit Application Fee .
__ v $600 .00 Public Infrastructure Inspection Fee if applicable. (This fee is payable if construction of a public
/waterline, sewerline, sidewalk, street or drainage facilities is involved.)
__ Eleven (11) folded copies of site plan
__ One (1) folded copy of the landscape plan.
__ Two (2) copies of public infrastructure plans associated with this site plan (if applicable) .
.fJl..k_ One (1) copy of building elevation required for buildings with a footprint of 20,000 sq. ft. or greater
JlfI_ A list of bu ilding materials for all facades that are visible from the public right-of-way . VA copy of the attached site plan checklist with all items checked off or a brief explanation as to why they
are not checked off. ~vk Parkland Dedication requirement approved by the Parks & Recreation Board, please provide proof of
approval (if applicable).
City W6E swno,)
E-Mail Address ___...·~-------
Fax Number 1JC1 · 6q3 ·_lf6~8~6 ____ _
Street Address -~-=:;.___i="-'-4--=-~~-""----'--=.:...=------
State __,j(,__·Y--_~_
Phone Number --'-"'---'-"---'L---'-'~----
PROPERTY OWNER'S INl(ORMATION :
Name )) (YlE
Street Address ------------------City----------
State _____ Zip Code _____ _ E-Mail Address ------------
Phone Number -----------Fa x Number ____________ _
E-Mail Address
Fax Number CJ-Ji-.1 -· -(B-~4_.__-1-'-'0'--2?1'__.1 ____ _
OTHER CONTACTS (Please specify type of contact, i.e. project manager, potential buyer, local contact, etc .)
6/13/0 3 I of6
Name ~~!..=....!.....!.~----=:..i..:.._:....!.£:...i......::i.:::.____ll,.-1-~J!...L~-----'<-l-l-..!.---"'=--.:...--=="""'-A"~-.-------
Street Address _..;.J._._.__-'-""----'-----'-'"""""-=:._-+'-"-"'""----------
State _1.µ'i.......__ __ _ E-Mail Address -------------
Phone Number ---'--'-----'-...:.._;:_---'=-=---'-"'----
Fax Number _____________ _
CURRENT ZONING
PRESENT USE OF -PR_O_P-ER_T_Y-=--=--=-~v-A:q_-¢-'-'-tr:.;---, -=--=---/j)_-lf:_-~_-_-_-_-_-_-_-~~--~~----_-_-_-_-_-_-~_-_
PROPOSED USE OF PROPERTY
VARIANCE(S) REQUESTED AND REASON(S) __________________ _
#OF PARKING SPACES REQUIRED I 0 #OF PARKING SPACES PROVIDED { 0
MULTl-FAMIL Y RESIDENTIAL PARKLAND DEDICATION
Total Acreage ____ _ # of Multi-Family Dwelling Units
Floodplain Acreage __ _ ---x $452 = $ --------
Housing Units ____ _ ___ # of acres in floodplain
#of 1 Bedroom Units # of acres in detention ------
#of 2 Bedroom Units ---___ # of acres in greenways
___ # of 3 Bedroom Units ___ date dedication approved by Parks Board
#of 4 Bedroom Units COMMERCIAL ---
FOR 2 BEDROOM UNITS ONLY Total Acreage --~2.-____ _
___ #Bedrooms = 132 sq . ft. Building Square Feet ·~;)O,_,/
___ #Bedrooms < 132 sq . ft. Floodplain Acreage ..... tv~l_A-___ _
NOTE: Parkland Dedication fee is due prior to the issuance of a Building Permit.
The applicant has prepared this application and certifies that the facts stated herein and exhibits attached
here to are true and correct ..
plicant Date I 2
6/13/03 2 of 6
" .
GALINDO ENGINEERS AND PLANNERS, !NC.
3833 South Texas Ave., Suite 213 Bryan, Texas 77802 (979) 846-8868
January 7, 2005
Ms. Carol Cotter
Engineering Department
City of College Station
College Station, TX
Subject:
Dear Carol:
Drainage Report
Jim Stuckey Insurance
College Station, TX
Please find enclosed the referenced report that covers Lot 8-B, Block D, Ashford Square
Subdivision, College Station, TX.
Sincerely,
GALINDO ENGINEERS AND PLANNERS, /NC.
~~~~~ ..._ _____ .... --
Christi an A. Galindo, P.E., R.P.L.S.
President
cc: Bruce Olson
M-M Design
... ,,,,,\,\\\\\\\
~~.,.,. t, 0 F I ''-• : "'~ ~ ............... ~.-t-Af .,
: c, ..... •. ·· ... tf' ''1~ ~ * :' ~ ".1c 'I ~*l ~· ~-'tl-'·······································Z ~CHRISTIAN A. GALINDOi
~·•••••••••••••••e••o•••••••••et1••••• .. ••-••••.i/f! " . 42~ • ilf1 "l-0\ 53 :> ~Q;-i" ~~·.,p <':)/4.i~ ,, o,<' "·.F.c i r.·1~~~··· .._«, : .... .L"-•. '~ ~ •• ,~~ .f"'-3'
"'• '•;,s' "•••• ,,.,•• ,(j.•• n,. ta 8 IONAL "-~ .~;:,"' ,,,\ . .., .. ::.
\\\~'''~..,.;·
\
1. TRACT DESCRIPTION
JIM STUCKEY INSURANCE
DRAINAGE REPORT
This project covers Lots BB, Block D, Replat of Block D, Replat of Lot B, Block D,
Ashford Square. The total area studied is 0.21 acres. The project is located just off
of Southwest Parkway west of the intersection with Texas Ave. Access to the site is
through concrete private streets.
The project area is currently vacant except for portions of existing concrete drives
and parking area. The Owner plans to build a 2307 s. f. building on the tract that is
currently being designed by M-M Design.
A separate 24"x36" sheet, Grading and Drainage Plan, is part of this report and will
be ref erred here as Exhibit 1 •
The adopted Flood Insurance Study does not identify the existence of a 100-yr flood
plain affecting this tract (Map# 4B041 C 0144 C, July 2, 1992).
2. STORMWATER RUNOFF
Most of this tract's runoff flows in a general easterly direction, as sheet flow,
through the existing parking and driving areas in adjoining Lot BC, BD, and BE, Block
D.
Exhibit 1 shows the tract, its location and existing spot elevations. This exhibit also
shows the proposed construction project and the proposed grading of the tract.
Topographic data was developed under the supervision of the undersigned. The
tract has been divided into three drainage sections:
Section 1 -Existing parking and driving area along frontage concrete street -
0.0B1 acre
Section 2 -Proposed building -0.053 acre
Section 3 -Existing ground that will remain unchanged -0.074 acre
Page 2
3. HYDROGRAPHS
Exhibit 2 is a recap of the hydrographs developed for 2-, 5-, 10-, 25-, 50-, and 100-
yer storms. The post-development runoff for any of these storms does not exceed
29% of the pre-development runoff.
Calculations in this section have been performed using software from lntellisolve
Hydraflow 2004. Exhibit 3 (6 pages) graphically shows the hydrographs for the
existing condition of the tract for all storm frequencies. Exhibit 4 (6 pages) similarly
is a graphic display of the hydrographs for all storm frequencies for post
development conditions.
4. PROPOSED GRADING AND STORMWATER RUNOFF DETENTION
The proposed grading for the tract can be seen in Exhibit 1. Because of the relative
small size of the tract and resulting increase in runoff flow rate no detention facility
is contemplated for this project.
5. CERTIFICATION
This report and design conform to the City of College Station Drainage Policy and
Design Standards.
CHRiSTIAN A. GALINDO, P .E. # 53425, R.P .LS. # 4473
January 7, 2005
Page 3
EXHIBIT 2
Hydrograph Return Period Recap
Hyd. Hydrograph Inflow Peak Outflow (cfs) Hydrograph
No. type Hyd(s) description
(origin) 1-Yr 2-Yr 3-Yr 6-Yr 10-Yr 26-Yr 50-Yr 100-Yr
1 Mod . Rational ----0 .46 --0 .56 0 .63 0.72 0.81 0 .85 PreDev. Pavement
2 Mod . Rational ----0 .28 --0 .34 0 .38 0 .44 0.49 0 .52 PreDev. Nat. Ground
3 Co mbine 1, 2 --0.74 --0.90 1.01 1.16 1.31 1.36 PreDev. Total
4 Mod. Rational -- --
0 .46 --0 .56 0.63 0 .72 0 .81 0.85 PostDev. Pavement
5 Mod . Rational -- --
0 .30 --0 .37 0.41 0.47 0.53 0.56 PostDev. Building
6 Mod . Rational -- --
0 .19 --0 .23 0.25 0 .29 0 .33 0.34 Unaltered Runoff
7 Combine 4 ,5,6 --0 .95 --1.15 1.30 1.48 1.67 1.75 PostDev . Total
:
Proj . file: Lot 88, Ashford Square.gpw Thursday, Jan 6 2005, 4:40 PM
Hydraflow Hydrographs by lntelisolve
· Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 3
PreDev. Total
Hydrograph type
Storm frequency
Inflow hyds .
= Combine
= 2 yrs
= 1,2
a (cfs)
1.00
0.90
0 .80
0.70
0 .60
0 .50
0.40
0.30
0.20
0.10
0 .00
0 5
-HydNo.3 --6\-Hyd No . 1
PreDev. Total
Hyd . No . 3 --2 Yr
10
EXHIBIT 3
Thursday, Jan 6 2005, 4 :18 PM
Peak discharge
Time interval
= 0 .74 cfs
= 1 min
Hydrograph Volume= 0 .010 acft
a (cfs)
1.00
0.90
0.80
0 .70
0 .60
0.50
0.40
0 .30
0 .20
0 .10
0.00
15 20
4-HydNo.2
Time (min)
Hydrograph Plot
Hydranow Hydrographs by lntelisolve
Hyd. No. 3
PreDev. Total
Hydrograph type
Storm frequency
Inflow hyds .
= Combine
= 5 yrs
= 1,2
Q (cfs)
1.00
0 .9 0
0.80
0 .70
0 .60
0 .50
0.40
0.30
0.20
0 .10
0.00
0 5
-HydNo.3 -€?-Hyd No .1
PreDev. Total
Hyd . No . 3 --5 Yr
10
Thursday, Jan 6 2005, 4:22 PM
Peak discharge
Time interval
= 0 .90 cfs
= 1 min
Hydrograph Volume = 0.012 acft
Q (cfs)
1.00
0 .90
0 .80
0 .70
0 .60
0 .50
0.40
0 .30
0.20
0 .10
0 .00
15 20
--*-Hyd No. 2
Time (min)
Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 3
PreDev. Total
Hydrograph type · = Combine
Storm frequency = 1 O yrs
Inflow hyds. = 1, 2
Thursday , Jan 6 2005, 4:23 PM
Peak discharge = 1.01 cfs
Time interval = 1 min
Hydrograph Volume = 0.014 acft
PreDev. Total
Q (cfs) Hyd. No . 3 -10 Yr Q (cfs)
2.00 ~---------.---------,-----------.-------~ 2.00
1.00
0.00 __ ==-._ _____ __,_ _______ __,__ ______ __1 ______ __:::!! __ 0.00
0 5 10 15 20
-HydNo.3 -e-Hyd No.1 ~ HydNo.2
Time (min)
I '• \:
Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 3
PreDev . Total
Hydrograph type = Combine
Storm frequency = 25 yrs
Inflow hyds. = 1, 2
PreDev. Total ·
Thursday, Jan 6 2005 , 4:24 PM
Peak discharge
Time interval
= 1.16 cfs
= 1 min
Hydrograph Volume = 0.016 acft
Q (cfs) Hyd. No . 3 --25 Yr Q (cfs)
2 .00 -r-----------r---------,--------.----------~ 2.00
1.00
0.00 __.,,::..._ _____ ___,_ ______ ____J_------, _____ ...L_ _____ --=:='!!~ 0 .00
0 5 10 15 20
-HydNo.3 -&-Hyd No.1 ~ HydNo.2
Time (min)
Hydrograph Plot
Hydraflow Hydrographs by lnteli&Olve
Hyd. No. 3
PreDev. Total
Hy drograph type
Storm frequency
Inflow hyds .
= Combine
= 50 yrs
= 1, 2
PreDev. Total
Thursday, Jan 6 2005, 4:31 PM
Peak discharge
Time interval
= 1.31 cfs
= 1 min
Hydrograph Volume = 0.018 acft
Q (cfs) Hyd. No . 3 -50 Yr Q (cfs)
2.00 ..,----------,---------.--------r--------~ 2.00
1.00
0.00 ~'---------'---------1 _______ ..L__ _____ ~--0.00
0 5 10 15 20
-HydNo.3 ~ HydNo.1 -*9 Hyd No . 2
Time (min)
Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 3
PreDev. Total
Hydrograph type
Storm frequency
Inflow hyds .
= Combine
= 100 yrs = 1,2
PreDev. Total
Thursday, Jan 6 2005, 4:28 PM
Peak discharge
Time interval
= 1.36 cfs
= 1 min
Hydrograph Volume = 0.019 acft
Q (cfs) Hyd. No. 3 -100 Yr Q (cfs)
2.00 ~------~-------~------~-------~ 2.00
0.00 --==---------------1. _______ J_ ______ _____L ______ _::!!~ 0.00
0 5 10 15 20
-HydNo.3 -6-Hyd No .1 ~ HydNo.2
Time (min)
Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 7
PostDev . Total
Hydrograph type · = Combine
Storm frequency = 100 yrs
Inflow hyds . = 4 , 5 , 6 ·
PostDev. Total
EXHIBIT 4
Thursday, Jan 6 2005, 4:39 PM
Peak discharge
Time interval
= 1.75 cfs
= 1 min
Hydrograph Volume = 0.024 acft
Q (c fs) Hyd . No . 7 --100 Yr Q (cfs)
2.00 .-----------,--------,---------,--------r-2 .00
1.00
0 .00 --"""---------1 _______ _!_ ______ __J ______ ~--0 .00
0 5 10 15 20
-HydNo. 7 -9-Hyd No . 4 -*9 Hyd No. 5 -8-Hyd No. 6
Time (min)
Hydrograph Plot
Hydraftow Hydrographs by lntelisolve
Hyd. No. 7
Pos tDev . Total
Hydrograph type · = Combine
Storm frequency = 50 yrs
Inflow hyds . = 4 , 5 , 6
PostDev. Total
Thursday, Jan 6 2005, 4:38 PM
Peak discharge
Time interval
= 1.67 cfs
= 1 min
Hydrograph Volume = 0.023 acft
Q (cfs) Hyd . No. 7 --50 Yr Q (cfs)
2.00 .-----------.--------.-----------.--------,-2.00
1.00
0.00 ~=------_____L _______ __J__ ______ ___i ______ ~--0.00
0 5 10 15 20
-HydNo. 7 -&-Hyd No . 4 ~ HydNo.5 -9-Hyd No. 6
Time (min)
.
Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 7
PostDev. Total
Hydrograph type = Combine
Storm frequency = 25 yrs
Inflow hyds . = 4, 5, 6
Thursday, Jan 6 2005, 4:36 PM
Peak discharge
Time interval
= 1.48 cfs
= 1 min
Hydrograph Volume = 0 .020 acft
PostDev. Total
Q (cfs) Hyd. No . 7 --25 Yr Q (cfs)
2.00 .-----------,.---------.----------,.--------~ 2.00
1.00
0.00 ~~~=---___ _L ______ _L ______ _l_ ___ -=~~w_ 0.00
0 5 10 15 20
-HydNo. 7 -(!?-Hyd No. 4 --*-Hyd No. 5 -8-Hyd No . 6
Time (min)
Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 7
PostDev . Total
Hydrograph type
Storm frequency
Inflow hyds.
= Combine
= 10 yrs
= 4 ,5,6
Thursday , Jan 6 2005 , 4:35 PM
Peak discharge
Time interval
= 1.30 cfs
= 1 min
Hydrograph Vo lume = 0.018 acft
PostDev. Total
Q (cfs) Hyd . No. 7 --10 Yr Q (cfs)
2 .00 ,-------------.---------.------------.-------~ 2.00
~~:::::_J_~~~_J_~~__J__::::::~~ 0 .00 0 .00
0 5 10 15 20
-HydNo. 7 -ft-Hyd No . 4 ~ HydNo.5 -8-Hyd No. 6
Time (min)
Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 7
PostDev. Total
Hydrograph type · = Combine
Storm frequency = 5 yrs
Inflow hyds . = 4, 5 , 6
Thursday, Jan 6 2005, 4:34 PM
Peak discharge = 1.15 cfs
Time interval = 1 min
Hydrograph Volume= 0.016 acft
Post Dev. Total
Q (cfs) Hyd. No . 7 --5 Yr Q (cfs) 2.00 ~------~-------~------~-------~ 2.00
0 .00 1~~~§~~g===~===r==~~=~9:~§~~~~1 0.00
0 5 10 15 20
-HydNo. 7 -€?-Hyd No. 4 ~ HydNo.5 -9-Hyd No . 6
Time (min)
· Hydrograph Plot
Hydraftow Hydrographs by lntelisolve
Hyd. No. 7
PostDev . Total
Hydrograph type = Combine
Storm frequency = 2 yrs
Inflow hyds . = 4 , 5, 6
a (cfs)
PostDev. Total
Hyd . No . 7 --2 Yr
Thursday, Jan 6 2005 , 4:33 PM
Peak discharge = 0 .95 cfs
Time interval = 1 min
Hydrograph Volume = 0.013 acft
1.00 --,----------~-------~------~-------~
a (cfs)
1 .00
0 5 10
-HydNo. 7 -e-Hyd No. 4 -"*-Hyd No. 5
15
-B-Hyd No . 6
0 .50
0.40
0 .30
0 .20
0 .10
0.00
20
Time (min)
CJS --O if-
1-10 -05
GALINDO ENGINEERS AND PLANNERS, INC. j ~~
3833 South Texas Ave., Su ite 213 Bryan , Texas 77802 (979) 846 -8868 ~--
January 7, 2005
Ms. Carol Cotter
Engineering Department
City of College Station
College Station, TX
Subject:
Dear Carol:
Drainage Report
Jim Stuckey Insurance
College Station, TX
2-05
Please find enclosed the referenced report that covers Lot 8-B, Block D, Ashford Square
Subdivision, College Station, TX .
Sincerely,
GALINDO ENGINEERS AND PLANNERS, INC.
~~~dj
Christian A. Galindo, P .E., R.P .LS.
President
cc: Bruce Olson
M-M Design
ot.'"lli.'"''\\\\\\\\ -~~ ~OF r 'Gt =~ ~ ~ ............... ~~,, •• ,,,
: c, .... ·· •. cf' 'I~
-.d.. •' . •. • • .h ,~
""''·"' _. ·.~ 'I :1-kf . "::.*l ,;'••••eeeeoeee•eeeoeeeeeeoeoeeeeeeeeeeeee~
~CHRI STIAN A. GALINDO~
~ "•••••• ••••• •o••e• ••••••••••eecio eGeeHo•••••••.if! ~ • 5342~ : jll ~"'°"-.:> l<J::' 'I "'P. ··./? <.<':> ••• 4.; # le, OA' •• l:r:i '"Tt~"'·· .._«./,:
•.41 A .... '•,;' •..) ,•''• ,":~• '""
1:g1 ._ ..s'o ''•• ,,,. '(J.' ··~
11 ee u/ONA' "-~ .,:,:.."' Q~ll \.. .... ~·-'\\\\~ '!\ ..... ~ ..... ""·
1. TRACT DESCRIPTION
JIM STUCKEY INSURANCE
DRAINAGE REPORT
This project covers Lots BB, Block D, Replat of Block D, Replat of Lot B, Block D,
Ashford Square. The total area studied is 0.21 acres. The project is located just off
of Southwest Parkway west of the intersection with Texas Ave. Access to the site is
through concrete private streets.
The project area is currently vacant except for portions of existing concrete drives
and parking area. The Owner plans to build a 2307 s. f. building on the tract that is
currently being designed by M-M Design.
A separate 24"x36" sheet, Grading and Drainage Plan, is part of this report and will
be referred here as Exhibit 1 •
The adopted Flood Insurance Study does not identify the existence of a 100-yr flood
plain affecting this tract (Map# 4B041 C 0144 C, July 2, 1992).
2. STORMWATER RUNOFF
Most of this tract's runoff flows in a general easterly direction, as sheet flow,
through the existing parking and driving areas in adjoining Lot BC, BD, and BE, Block
D.
Exhibit 1 shows the tract, its location and existing spot elevations. This exhibit also
shows the proposed construction project and the proposed grading of the tract.
Topographic data was developed under the supervision of the undersigned. The
tract has been divided into three drainage sections:
Section 1 -Existing parking and driving area along frontage concrete street -
0.0B1 acre
Section 2 -Proposed building -0.053 acre
Section 3 -Existing ground that will remain unchanged -0.074 acre
Page 2
3. HYDROGRAPHS
Exhibit 2 is a recap of the hydrographs developed for 2-, 5-, 10-, 25-, 50-, and 100-
yer storms. The post-development runoff for any of these storms does not exceed
29% of the pre-development runoff.
Calculations in this section have been performed using software from lntellisolve
Hydraflow 2004. Exhibit 3 (6 pages) graphically shows the hydrographs for the
existing condition of the tract for all storm frequencies. Exhibit 4 (6 pages) similarly
is a graphic display of the hydrographs for all storm frequencies for post
development conditions.
4. PROPOSED GRADING AND STORMWATER RUNOFF DETENTION
The proposed grading for the tract can be seen in Exhibit 1. Because of the relative
small size of the tract and resulting increase in runoff flow rate no detention facility
is contemplated for this project.
5. CERTIFICATION
This report and design conform to the City of College Station Drainage Policy and
Design Standards.
CHRiSTIAN A. GALINDO, P.E. # 53425, R.P.L.S. # 4473
January 7, 2005
Page 3
EXHIBIT 2
Hydrograph Return Period Recap
Hyd. Hydrograph Inflow Peak Outflow (cfs) Hydrograph
No . type Hyd(s) description
(origin) 1-Yr 2-Yr 3-Yr 6-Yr 10-Yr 26-Yr 50-Yr 100-Yr
1 Mod . Rational ----0 .46 --0 .56 0 .63 0 .72 0 .81 0 .85 PreDev. Pavement
2 Mod . Rational ----0 .28 --0 .34 0 .38 0 .44 0 .49 0 .52 PreDev. Nat. Ground
3 Combine 1, 2 --0.74 --0.90 1.01 1.16 1.31 1.36 PreDev. Total
4 Mod . Rational ----0 .46 --0 .56 0 .63 0.72 0 .81 0 .85 PostDev. Pavement
5 Mod . Rational ----0 .30 --0 .37 0 .41 0.47 0.53 0 .56 PostDev. Build ing
6 Mod . Rational ----0 .19 --0.23 0 .25 0 .29 0.33 0.34 Unaltered Runoff
7 Combine 4 ,5 ,6 --0.95 --1.15 1.30 1.48 1.67 1.75 PostDev. Total
'
Proj . file : Lot 88, As hford Square.gpw Thursday , Jan 6 2005, 4:40 PM
Hydraflow Hydrographs by lntelisolve
I
Hydrograph Plot
Hydranow Hyd rographs by lntelisolve
Hyd. No. 3
PreDev . Tota l
Hyd rograph type · = Combine
Storm frequency = 2 yrs
Inflow hyds . = 1, 2
a (cfs)
1.00
0 .90
0 .80
0.70
0.60
0.50
0 .4 0
0 .30
0 .20
0 .1 0
0 .00
0 5
-HydNo.3 --6\-Hyd No. 1
EXHIBIT 3
Thursday, Jan 6 2005 , 4:18 PM
Peak discharge = 0 . 7 4 cfs
Time interval = 1 min
Hydrograph Volume = 0.010 acft
PreDev. Total
Hyd. No. 3 --2 Yr Q (cfs)
1.00
0.90
0 .80
0.70
0.60
0 .50
0.40
0.30
0.20
0 .10
0.00
10 15 20
--*-Hyd No. 2
Time (min)
,
Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 3
PreOev . Total
Hydrograph type
Storm frequency
Inflow hyds.
= Combine
= 5 yrs = 1,2
Q (cfs)
1.00
0 .90
0 .80
0 .70
0 .60
0 .50
0.40
0.30
0 .20
0.10
0.00
0 5
-HydNo.3 -f7-Hyd No.1
PreDev. Total
Hyd. No. 3 - 5 Yr
10
Thursday, Jan 6 2005, 4:22 PM
Peak discharge
Time interval
= 0.90 cfs
= 1 min
Hydrograph Volume = 0.012 acft
Q (cfs)
1.00
0 .90
0 .80
0 .70
0.60
0.50
0.40
0.30
0.20
0 .10
0.00
15 20
--9*-Hyd No. 2
Time (min)
,
Hydrograph Plot
Hydraflow Hydrographs by lnteUsolve
Hyd . No. 3
PreDev. Total
Hydrograph type
Storm frequency
Inflow hyds .
= Combine
= 10 yrs = 1,2
PreDev. Total
Thursday, Jan 6 2005 , 4:23 PM
Peak discharge
Time interval
= 1.01 cfs
= 1 min
Hydrograph Volume = 0.014 acft
Q (cf s) Hyd. No . 3 -10 Yr Q (cfs)
2.00 --.------------,----------.--------,----------.--2.00
0.00 ---==------------'---------'---------'--------=--0.00
0 5 10 15 20
-HydNo.3 -e-Hyd No.1 -+ HydNo.2
Time (min)
. ·. ~
• Hydrograph Plot
Hydranow Hydrographs by lntelisolve
Hyd. No. 3
PreDev . Total
Hydrograph type = Combine
Storm frequency = 25 yrs
Inflow hyds. = 1, 2
Thursday, Jan 6 2005, 4:24 PM
Peak discharge = 1.16 cfs
Time interval = 1 min
Hydrograph Volume • 0.016 acft
PreDev. Total
Q (cfs) Hyd . No. 3 --25 Yr Q (cfs)
2.00 .--------.----------.--------.----------.--2.00
0.00 --='----------'---------'--------.L.-------=--0.00
0 ~ 5 10 15 20
-HydNo.3 -&-Hyd No .1 ~ HydNo.2
Time (min)
• Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 3
PreDev. Tota l
Hydrograph type · = Combine
Storm frequency = 50 yrs
Inflow hyds . = 1, 2
Thursday, Jan 6 2005, 4:31 PM
Peak discharge = 1.31 cfs
Time interval = 1 min
Hydrograph Volume " 0.018 acft
PreDev. Total
Q (cfs) Hyd . No. 3 -50 Yr Q (cfs)
2.00 -.-------------.--------~-------~------~ 2 .00
0.00 --==-----------'-----------1-------.L.._-----~--0.00
0 5 10 15 20
-HydNo.3 -9-Hyd No .1 -9*-HydNo.2
Time (min)
.
Hydrograph Plot
Hydra fl ow Hydrographs by lnteUsotve
Hyd. No. 3
PreDev . Tota l
Hydrograph type
Storm frequency
Inflow hyds.
= Combine
= 100 yrs = 1,2
PreDev. Total
Thursday, Jan 6 2005, 4:28 PM
Peak discharge
Time interval
= 1.36 cfs = 1 min
Hydrograph Volume = 0.019 acft
Q (cfs) Hyd. No . 3 -100 Yr Q (cfs)
2.00 -.----------,.--------..,.--------~------~ 2.00
0.00 --='---------'---------'--------..1.-----------"--0.00
0 5 10 15 20
-HydNo.3 -e-Hyd No .1 --*:-Hyd No. 2
Time (min)
Hydrograph Plot
Hydra fl ow Hydrographs by lntelisolve
Hyd. No. 7
Pos tDev. Total
Hydrograph type = Combine
Storm frequency = 100 yrs
Inflow hyds. = 4 , 5 , 6 ·
PostDev. Total
EXHIBIT 4
Thursday, Jan 6 2005, 4:39 PM
Peak discharge
Time interval
= 1.75 cfs
= 1 min
Hydrograph Volume = 0.024 acft
Q (cfs) Hyd . No. 7 --100 Yr Q (cfs)
2 .00 ~------~-------~------~-------~ 2.00
0 .00 --~-------"---------'----------"---------=::!II--0 .00
0 5 10 15 20
-HydNo. 7 -6\-Hyd No . 4 -*9 Hyd No. 5 -8-Hyd No . 6
Time (min)
; '
Hydrograph Plot
Hydraflow Hydrographs by lnteJisolve
Hyd. No. 7
PostDev. Total
Hydrograph type
Storm frequency
Inflow hyds .
= Combine
= 50 yrs
= 4,5,6
PostDev. Total
Thursday, Jan 6 2005, 4:38 PM
Peak discharge
Time interval
= 1.67 cfs
= 1 min
Hydrograph Volume = 0.023 acft
Q (cfs) Hyd. No . 7 -50 Yr Q (cfs)
2.00 ,-------------.---------.-----------.,.--------.-2.00
1.00
0.00 ~=------............l. _______ _i_ ______ ____L ______ ~--0.00
0 5 10 15 20
-HydNo. 7 ~ HydNo.4 ~ Hyd No. 5 -Q.. Hyd No. 6 Time (min)
Hydrograph Plot
Hydraflow Hydrographs by lntel isolve
Hyd. No. 7
PostDev. Total
Hydrograph type = Combine
Storm frequency = 25 yrs
Inflow hyds . = 4 , 5, 6
PostDev. Total
Thursday, Jan 6 2005 , 4:36 PM
Peak discharge
Time interval
= 1.48 cfs
= 1 mi n
Hyd rograph Volume = 0.020 acft
Q (cfs) Hyd. No . 7 -25 Yr Q (cfs)
2 .00 --.-----------,--------~---------,--------~ 2.00
1 .00
0 .00 JM~~:= __ _J ______ _J_ ______ l__ __ =~~~ 0 .00
0 5 10 15 20
-HydNo. 7 --(7-Hyd No. 4 -X-Hyd No . 5 -9-Hyd No. 6
Time (min)
.
Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 7
PostDev . Tota l
Hydrograph type · = Combine
Storm frequency = 1 O yrs
Inflow hyds . = 4 , 5, 6
Thursday, Jan 6 2005, 4:35 PM
Peak discharge = 1.30 cfs
Time interval = 1 min
Hydrograph Volume = 0.018 acft
PostDev. Total
Q (cfs) Hyd . No . 7 --10 Yr Q (cfs)
2 .00 -,------------.--------.-----------.--------.-2 .00
0 5 10
-HydNo. 7 -ft-Hyd No . 4 -*-Hyd No. 5
15
-8-Hyd No . 6
1.00
0 .00
20
Time (min)
.
Hydrograph Plot
Hydrafiow Hydrographs by lntelisolve
Hyd. No. 7
PostDev. Total
Hydrograph type ·
Storm frequency
Inflow hyds .
= Combine
= 5 yrs = 4,5,6
Thursday, Jan 6 2005, 4 :34 PM
Peak discharge
Time interval
= 1.15 cfs
= 1 min
Hydrograph Volume = 0 .016 acft
PostDev. Total
Q (cfs) Hyd. No . 7 --5 Yr Q (cfs)
2 .00 -.---------.,------------,-----------.--------~ 2.00
~~~~~~ 0 .00 0.00
0 5 10 15 20
-HydNo. 7 -8-Hyd No . 4 ~ HydNo.5 -8-Hyd No. 6
Time (min)
• Hydrograph Plot
Hydraflow Hydrographs by lntelisolve
Hyd. No. 7
PostDev . Total
Hydrograph type · = Combine
Storm frequency = 2 yrs
Inflow hyds . = 4 , 5, 6
Thursday, Jan 6 2005, 4:33 PM
Peak discharge = 0.95 cfs
Time interval = 1 min
Hydrograph Volume = 0.013 acft
PostDev. Total
Q (cfs) Hyd. No. 7 --2 Yr Q (cfs)
1.00 .,.---------.--------.----------.-------......-1.00
0 .00 ~==---------------'---------'--------------'---------"""'--0.00
0 5 10 15 20
-HydNo. 7 -€7-Hyd No. 4 -X-Hyd No. 5 -S-Hyd No. 6
Time (min)