HomeMy WebLinkAbout4 College Station Prof Bldg Two 05-29 1603 Rock PrairieDrainage and Detention Report
Prepared.fo r :
R&S LEASING
COLLEGE STATION PROFESSIONAL BUILDING TWO
CERTIFICATION:
City of College Station
Brazos County, Texas
PK Job N o. 52 80 5-29 1
Da te :
July 18 , 200 5
October 24 , 200 5
Prepar ed by:
Pledger Kalkomey, Inc.
Consulting Engineers
71120 (',·~Pl•' I{ un • Br~ an. I .:\a' 7XOX
9 79-7y l-X!Hl0 • I) 9 -7.> 1-1 :'00 I l":t\I
"\\W .pke ng in eer in g .com
Brenham • Bry an • Rosen be rg
I hereby certify that this report was prepared by me (or under my
supervision) in accordance with the provisions of the City of College
Station Drainage Policy and Design Standards for the owners thereof.
REVISIONS
The repor t dated July 18 , 2005 was revised to acc ount for
changes made to the proposed grades of the deten tion pond.
PURP OSE
Developmen~ of the subject property involves the additi on of a
building, sidewalks , drive , and parking spac es . The dra inage
area affe~ced by the developmenc concains approximately 7. 2
acres of ~and. Reference is made t o the attached grading plan
(sheet C.3 of 4 , Dra ft dated 7 /18 /0 5) draw ing. The increase in
runoff from the development for the twenty-five year (25 -year)
storm eve nt must be mitigated to not increase downstream flo w
rates. Th is report docume nts the engineer ing analysis for the
mitigation thro ugh the use of a detention basin.
METHODOLOG Y
Using field surveying data the watershed affected by the
proposed development was delineated .
The Ration al Met hod was used to compute the peak flow rate for
this study. The area (A) of the drainage area was obtained fro m
the maps . Based on existing land use patterns, the weighted c
factor f or the area was determined. A v elocity-distance
relations hip was u sed to compute the time of concentration ( t c )
for the area with a minimum time of concentration of ten (1 0)
minutes. The rainfall intensity (I) for the drainage area was
determined using the intensity-duration-frequency curves for the
City of College Station (Figure III-1, Drainage Policy and
Design Stan dards).
The peak flow rate (Q) for the drainage area was computed with
the follo wing formula:
Q = (C) (I) (A)
S :\2005152805-291 R&S-med ical \drain report\dra in report-R&S MED REVISED .doc
,..,,r iangular approximation hydr ographs for the 5 , 10, 25, 50, and
100-yr storms were then developed for
runoff conditions with the base of the
the post development
triangular hydrograph
being 3.0 times the time of concentration . These runoff
hydrographs were then added to the existing discharge h ydrog raph
from the detention basin for Ponderosa Place Tr act B as
calculated in the attached Drainage Report . The addition of
~jese two hydrographs resulcs in the total posc-dev elopmenc
~nflow hydrograph for the detention basin.
Ou tflow hydrographs for the 5, 10, 25, 50, and 100-yr storms
were
for
developed using
the detention
the
basin
elevation-versus-storage relationship
and the
relationship for the outlet structu re.
elevation-versus-discharge
Discharge values for the
v-notch weir outlet structure are calculated by the equation {Q
= 2.5tan{0 /2)*H2 '5 ).
A modified Puls method was then used to route the existing and
developed conditions hydrograph through the basin. Haestad
Methods, Inc. computer model ing program Pond-2 Version 5 . 21 was
used for the calculations.
RESULTS
The dra inage area inf ormat i on and the cal culations for the
existing and proposed conditions are attached.
An expansion of the existing detention basin i s planned for the
development to off set the increase in runoff rates due t o the
increase in impervious cover in drainage areas 1 and 2. A 60-
degree reinforced concrete weir with a top elevation of 3 09 . 0 0
will act as an outlet structure to release the runoff at pre-
developed
concrete
rates. Th e
flume leading
runoff will discharge into an existing
to the cul-de-sac located at the South
S:\2005152805-291 R&S-medicalldra in reportl dra in report-R&S MED REVISED .doc
end of Longleaf Circle in the Southwoo d Terrace Subdivision .
Storage capacity of the detention basin exceeds that needed for
a 100 year storm . Excess run o ff fr om development in Drainage
Area 3 i s re-graded t o wards the deten t ion pond resulting in n o
additional flow toward s Rock Prairie Ro ad.
follows :
Summary data is as
DRAINAGE AREAS 1 AND 2 (PROPOSED DETENTION BASIN):
EXISTING :
Storm Peak Flow Rate
Event (cfs)
5 yr 22.37
10 yr 25.35
25 yr 29 .07
50 yr 32 .99
100 yr 34 .42
PROPOSED :
Peak Flow Peak Flow
Storm Rate In Rate Out Storage
Event (cfs) (c fs )** (ac-ft)
5 yr 48 .49 21 .53 0 .69
10 yr 53 .95 24 .24 0.76
25 yr 61. 60 28.35 0.85
50 yr 69 .26 32 .45 0.93
1 00 yr 72 .70 34 .26 0.97
*Top of headwall elev. = 309.00 ft.
**Out let -60 ° V-NOTCH WEIR
S :\2005152805-291 R&S-medical\drain reportl dra in report-R&S MEO REVISED .doc
Peak
Elevation
(ft)*
308.12
308 .27
308.47
308.65
308 .7 4
DRAINAGE AREA 3 (NO DETENTION REQUIRED):
EXISTING :
Storm Peak Flow Rate
Event (cfs )
5 yr 3 .50
3 . 92 -
25 yr 4.49
5 0 yr S .0 7
10 0 yr 5.3 0
PROPOSED :
Storm Peak Flow Rate
Even t (cfs)
5 yr 0 .47
1 0 yr 0 .53
25 yr 0.61
50 yr 0 .69
10 0 yr 0 .72
S:\2005152805-291 R&S-med ical\drain report\drain report-R&S MEO REVISED .doc
DRAWINGS
R&SLEASING
COLLEGE STATION PROFESSIONAL BUILDING TWO
CITY OF COLLEGE STATION
BRAZOS COUNTY, TEXAS
' -
~ --------I )'( I
9 ---\
170'
!1
/,
)
)-I
.r
'•
'
1; '
:1
" ·'' ... .,•
/'
I
/
, I )
DRAIN BOUNDAAY, TYP .
----
---
_..--......--------
EXISTING DRAINAGE AREAS
Rt S LEASING -
PROFESSIONAL BLDG TY'IO
COLLEGE STATION, TEXAS
IPllll Pl e d ge r Ka lkomey, Inc.
llll_KJ Consu l ti ng E nginee rs
70.:!0 Coyolc Run • Bryan , T cxa.1 771COM
~7'1 .7 .\l -M04HI • 97Q .7 .\l ·l~4HJjFll:()
www.r kcnginc:t"ring .com
Brt!nlwm · Bryan · Ro.rt>nherK
120'
.
\
1
I<&-
.---------,
(_
TIME or "OONCOORAOON
PATH, ffi'.
L..----1
_)~ \\ . _ __.. -· __.. . \
-~ . __..
....... , .. ··----__..-
\
\
\2
. \
--
DRAIN BOUNDARY, ffi'.
--~---
-----
\
I
PROPOSED DRAINAGE AREAS
R4 S LEASING -
PROFESSIONAL BLDG Tw:?
COLLEGE STATION, TEXAS
Pl edge r Kalkomey, Inc .
Consulting Enginee rs
711~11 Covolc Run · Oryilll, Tua"' 77lUUC
tJ79-7.l°i-Ko4H• · q19.7 _\l-l~rnqfu)
www.rkC'ng 1nccnng.com
llrt'nlwm · llrya n · Ro.ft!nh erx
DETENTION POND DA TA
R&SLEASING
COLLEGE STATION PROFESSIONAL BUILDING TWO
CITY OF COLLEGE STATION
BRAZOS COUNTY, TEXAS
POND-2 Version : 5 .21
S /N:
R&S LEASI~G -CS PROFESSIONAL BLDG TWO
COLLEGE ST ATION , TX
CALCU LATED :.:8 -22 -200 5 14:56 :46
DISK FILE : s:\engr \decain\r smed \RSMED .VOL
?lanimeter sca~e: : ft.
*
Elevation
(ft)
Planimeter
(sq . in .)
~r ea ~l+A2+sqr(Al*A2)
(acres ) (acres)
Volume
(acre-f t )
Volume Sum
(acre -ft)
305 .18 0 .00 ::i. 00 0 .00 0 .00 0 .00
306 .00 5,4 70 .00 0 .13 0 .13 0 .0 3 0 .03
307 .00 15 ,030 .00 0 .35 0.68 0.23 0 .26
308 .00 18 ,110 .00 0 .42 1 .1 4 0 .38 o :64
309 .00 22,300 .00 0 .51 1 .39 0 .46 1 .1 0
* Incremental volume comp-.1ted by the Conic Met hod f o r Res e rvo ir Vo lumes .
Volume= (1 /3) * (EL2 -E~l) * (Areal+ Ar ea 2 +sq.rt . (Are a l*Area 2 ))
wh e r e : EL l, EL 2
Are al ,Area2
Vo lume
Lower and upper elev at i on s of t he increme n t
Are as compu ted f o r ELl , EL 2 , respec tively
Incrementa l volume b e t ween ELl and EL 2
S:\2005152805-291 R&S-medicall drain re portl drain report,R&S MED REVISED .doc
Outlet Stru c t ure File: RSMED
POND -2 Version: 5 .21
Date Executed :
.STR
S /N :
Time Executed :
**************************************
R&S LEASING -CS PROFESS I ONAL BLDG TWO
COLLEGE STATION , TX
******************~*******************
***** COMPOSITE OUTFLOW SUMMARY ****
Elevation (ft) Q (cfs) Contr i buting St r uc tu res
---------------------------------------------
305 .18 0 .0 1
305 .4 3 0 .0 1
305 .6 8 0 .3 1
305 .93 0 .7 1
306 .1 8 1 .4 1
306 .4 3 2.5 1
306 .68 4 .0 1
306 .93 5 .8 1
3 07 .18 8 .2 1
307 .4 3 11 .0 1
307 .6 8 1 4.3 1
307 .9 3 1 8.1 1
308 .1 8 22 .5 1
3 08 .4 3 27.5 1
308 .6 8 33.l 1
308 .9 3 37 .9 1
309 .00 39.3 1
S :\2005152805-291 R&S-medical\drain re portl drain report-R&S MED REVISED.doc
Outlet Structur e Fil e : RS MED .STR
POND -2 Ve rsi on : 5.2 1
Date Execu te d :
S /N :
Time Exe c ut e d:
**************************************
R&S LEA SI NG -CS PRO F ES S I ONA L BLD G TWO
COLL EGE STA TI ON , T X
~~*~***~*** *~**~~~~**~*****~********T
Outlet Scruccu r e File :
Pl a nimete r I n p ut File:
Ra t ing T a b le Outpu t Fi le :
s :\eng r \d e ta in \rsmed \RS MED
s:\e ng r \det a i n \rsmed \RSMED
s:\engr \detain \rsmed \RSMED
.STR
.VOL
.PND
Min. E l e v . (ft) = 3 0 5 .1 8 Max . Elev. (ft) = 309 Iner. (ft)
Additional elevations (ft) to be inc l uded in table:
* * * * * * * * * * * * * * * * * * * * * * * * * *
**********************************************
SY S TEM CONNECTIVITY
**********************************************
Structure No . Q Table Q Table
TABLE 1 -> 1
Outflow rating table surrunary was stored in file:
s:\engr \detain \rsmed \RSMED .PND
S :\2005152805-291 R&S -med ical\drain reportl dra in report-R&S MED REVISED .doc
. 25
Outlet Structure File: RSME .S ~R
POND-2 Version : 5.21
Date Executed:
S / :
Time Executed:
*******************~******************
R&S LEASING -CS PR OFESSIONAL BLDG TWO
COLLEGE S~~TIOK, TX
>>>>>> St r u cc u ~2 No . : <<<<<<
(I n p u :: Data )
TABLE
Input your o~-rating table.
El (ft) =3 05 .:3 E2 (ft) = 309 .001
Constant (ft) added to each elevation was : 305 .18 -
Elev. (ft ) Q (cfs)
3 0 5.17 99 926757812
0
305 .42 99926757812
.045
305 .6799926757812
.255
305 .92 9992 6757812
.703
306 .1799926757812
1. 44
306 .4299926757812
2 .52
306.6799926757812
3 .98
306.9299926757812
5.85
307.1799926757812
8.16
307.4299926757812
10 .96
307.6799926757812
14 .26
307.9299926757812
18 .1
308 .1 799 926757812
22 .49
308 .42 99 926757812
27 .48
308 .6 799 926757812
33 .07
308 .9999926757812
39 .29
S:\2005\52805-291 R&S-medical\d rain reportl drain report-R&S MED REVISED .doc
o .c
Ou tlet Struc ture Fi l e : RSME D
PON D-2 Versi o n : 5 .21
Dat e Executed:
.S TR
S /N :
Time Executed:
**************************************
R&S LE AS I NG -C S PROF ES SI01"AL BLDG TWO
COLL EGE STATION , TX
Ou c.f l ow Rat i ng Table f o r St r uc tu re ;:_ · ·. -
':".l\BLC:: Input y o ·..ir own rating t a ~le .
E l e v ation (ft) Q (cfs) Computation Messages
---------------------
3 0 5.18 0 .0
305 .4 3 0 .0
3 0 5 .6 8 0 .3
305 .9 3 0 .7
3 0 6 .1 8 1. 4
30 6.4 3 2 .5
3 0 6 .6 8 4 .0
30 6 .93 5 .8
307 .1 8 8 .2
307 .43 _l. 0
307 .68 ·4_3
307 .93 18 .1
308 .1 8 22 .5
308 .43 27 .5
308 .68 33.1
308 .93 3 7 .9 Interpol ated fr om input ta ble
309 .00 39.3
E or > E 2=3 0 9
S:\2005152805-291 R&S-m edicalldrain report \drain report -R&S MED REVISED .doc
5-YR STORM EVENT
R&S LEASING
COLLEGE STATION PROFESSIONAL BUILDING TWO
CITY OF COLLEGE STATION
BRAZOS COUNTY, TEXAS
R & S LEASING -COLLEGE STATION PROFESSIONAL BLDG TWO 10/18/05 10 :33 PM
CITY OF COLLEGE STATION, BRAZOS COUNTY, TEXAS
REFERENCE : COLLEGE STATION DRAINAGE POLICY AND DESIGN STANDARDS
STORM EVENT : B D E
5 YR STORM 76 8 .5 0.785
D RAINAGE ARE A 1
EXISTING
TRAVEL V ,FPS TIME
T YPE LF % FIG 5 SEC MIN
TC , M IN NATURAL GRASSLANDS 1080 1.0 % 0 .90 1,200 .00 20 .00
20 .00
TYPE C (TBL5) I % c I
C , -NATURAL GRASS LA N DS (1.0 %) 0 .3 5 100 .0 % 0.35
100 .0% 0 .35
I, IN /HR B/(T C+D)"E 5.48
T Y PE SF I ACRES
A , ACRES NAT URAL G RAS S LAN DS 245,880 5 .64
245 ,880 5 .64
Q ,CFS CI A 10 .83
PROPOSED :
T RAV EL V , FPS T IME
T Y PE LF I % (FI G 5) SEC I MI N
T C, MIN LA ND SCAPED AR EAS 80 1.0% 0.90 88 .89 1.48
PAV E M E NT SHEET FLOW 80 1 .0 % 2 .8 3 28 .24 0 .47
CO NCRETE GUTTER 800 1.0 % 3.00 266 .67 4.44
10.00
I T YPE C (TBL5) I % c I
C.-LAND SCAPED AREAS (1 .0 %) 0 .40 22 .5 % 0 .09
IMP ERVI OU S AREAS 0 .90 77 .5 % 0 .70
10 0 .0% 0.79
I, IN/HR B/(T C +D )"E 7.69
I TYPE SF I ACRES I
A , AC RES LA N DS CAPED AREAS 67 ,820 1.56
IMPERVIOUS AREAS 233,600 5.36
301,420 6 .92
O .CFS CIA 41.92
R & S LEASING -COLLEGE STATION PROFESSIONAL BLDG TWO
C ITY OF COLLEGE STATION, BRAZOS COUNTY, TEXAS
REFERENCE : COLLEGE STATION DRAINAGE POLICY AND DESIGN STANDARDS
STORM EVENT:
5 YR STORM
B
76
D
8 .5
D RAINAGE AREA 2
EXI ST ING
TRAVEL
I T Y PE L F I %
TC , M IN NAT URAL GRASSLANDS 1080 1.0 %
T Y PE
C -NATU RAL GRASSLAN DS (1.0%)
I, IN/HR B/(T C+D )"E
TYPE
A , AC RES NATURAL G RAS SL A NDS
Q , C FS CI A
PROPOSED:
E
0.785
V ,FPS
(FIG 5 )
0 .90
C (TBL5)
0 .35
I
10/18 /05 10 :33 PM
TI ME
SEC I M IN
1,200 .00 20 .00
20 .00
% c
100 .0 % 0 .35
100 .0 % 0 .35
5.48
S F I ACRE S
26 2,260 6 .02
262 ,260 6.02
11.55
*DETENTI ON PO ND DATA US ED FRO M THE ATTACHED D RAINAG E REPORT FOR PONDE ROSA PLACE -TRACT B
DRAINAGE AREAS 1 AND 2
EXISTING
TRAVEL V , FPS T IME
I T Y PE LF I % (F IG 5) SE C I M IN
T C .MIN NATURAL GRASS LA N DS 1080 1 .0 % 0 .90 1,200 .00 20 .00
20 .00
I TYPE C (TBL5) I % c
C , -NATU RAL GRASSLANDS (1 .0 %) 0 .35 10 0 .0 % 0.3 5
100.0% 0 .35
I, IN/HR B/(T C+D)"E 5.48
I TYPE SF ACRES
A , ACRES NATU RAL GRASSLANDS 508 ,140 11.67
508 ,140 1 1.6 7
Q ,CF S CIA 22 .37
PROPOSED:
*SEE PO ST-DEVELOPMENT INFLOW HYDROGRAPH
I
I
I
I
R & S LEASING -COLLEGE STATION PROFESSIONAL BLDG TWO 10 /18/05 10 :33 PM
CITY OF COLLEGE STATION, BRAZOS COU NTY, TEXAS
REFERENCE: COLLEGE STATION DRAINAGE POLICY AND DESIGN STANDARDS
STORM EVENT: B D E
5 YR STORM 76 8 .5 0.785
DRAINAGE AREA 3
EXISTING
TRAVEL V , FPS TI ME
I TYPE LF I % (FIG 5) SEC I MI N
T C, MIN NATURAL GRASSLANDS 4 30 2 .6 % 0.90 477.7 8 7 .96
10.00
TYPE C (TBL5) I % c I
C ,-NATURAL GRASSLANDS (1.0 %) 0 .35 100.0 % 0 .35
100 .0 % 0 .35
I, IN /HR B/(TC+D)"E 7 .69
I TYPE SF I ACRES I
A , ACRES NATURAL GRASSLANDS 56 ,630 1.30
56,630 1.30
Q ,CFS CIA 3.50
PROPOSED:
TRAVEL V,FPS TIME
TYPE LF % FIG 5 SEC MIN
TC , MIN LANDSCAPED AREAS 100 1.0 % 0 .90 111 .11 1.85
CONCRETE GUTTER 300 1.0 % 3.00 100 .00 1.67
10 .00
TYPE C (TBL5) I % c I
C , -LA NDSCAPE D AREAS (1.0 %) 0 .40 82 .1% 0 .33
IMPERVIOUS AREAS 0 .90 17 .9% 0 .16
100 .0% 0.49
I, IN /HR B/(TC+D )"E 7 .69
I TYPE SF I ACRES I
A, ACRES LANDSCAPED AREAS 4 ,500 0 .10
IMPERVIOUS AREAS 980 0 .02
5,480 0 .13
Q ,CFS CIA 0.47
R & S LEASING -COLLEGE STATION PROFESSIONAL BLDG TWO
CITY OF COLLEGE STATION, BRAZOS COUNTY, TEXAS
REFERENCE : COLLEGE STATION DRAINAGE POLICY AND DESIGN STANDARDS
STORM EVENT:
5 YR STORM
Q peak
T c
T ime (min)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
B D E
76 8 .5 0.785
POST-DEVELOPMENT INFLOW HYDROGRAPH
41 .92 cfs
0 .166 7 hr
Time (hr) Area 1 runoff Area 2 Pond Discharge
0 .00 0 .00 0.00
0 .02 4 .19 0 .01
0.0 3 8 .38 0 .04
0 .05 12 .58 0 .14
0.07 16.77 0 .37
0 .08 20 .96 0 .80
0 .10 25 .15 1.51
0 .12 29 .34 2.57
0 .13 33 .54 4 .04
0 .15 37 .73 5 .54
0 .17 41 .92 6 .57
0 .18 39 .82 7.45
0 .20 37.73 8 .18
0 .22 35.6 3 8 .78
0 .2 3 33 .54 9.29
0.25 31.44 9.73
0 .2 7 29 .34 10 .10
0 .28 27 .25 10.42
0 .30 25 .15 10 .68
0 .32 23 .06 10 .90
0 .33 20 .96 11 .08
0 .35 18.86 11.22
0 .37 16 .77 11 .32
0 .38 14 .67 11.38
0.40 12 .58 11.41
0.42 10.48 11.41
0.4 3 8 .38 11.37
0.45 6 .29 11 .30
0.47 4.19 11 .20
0.48 2.10 11 .06
0.50 0 .00 10 .89
0.52 0 .00 10 .71
0 .53 0 .00 10 .52
0 .55 0 .00 10 .33
0 .57 0 .00 10.14
0 .58 0 .00 9 .95
0 .60 0 .00 9 .76
0 .62 0 .00 9 .58
0.63 0 .00 9 .39
0 .65 0.00 9 .20
0 .67 0 .00 . 9 .01
0 .68 0.00 8 .82
0 .70 0.00 8 .63
0 .72 0 .00 8.44
0 .73 0 .00 8 .25
0 .75 0.00 8 .06
0 .77 0.00 7 .88
10 /1 8/05 10 :33 PM
Total Flow
0 .00
4 .20
8.42
12 .72
17 .14
2 1.76
26.66
31 .91
37 .58
43 .26
48.49
47 .28
45 .91
44.41
42 .83
41 .17
39.45
37 .67
35 .84
33 .96
3204
30 .08
2809
26 .05
23 .99
21.89
19 .76
17 .59
15.39
13.16
10 .89
10 .71
10 .52
10 .33
10 .14
9 .95
9 .76
9 .58
9 .39
9 .20
9 .01
8 .82
8 .63
8.44
8 .25
8 .06
7 .88
R & S LEASING· COLLEGE STATION PROFESSIONAL BLDG TWO 10/18/05 10:33 PM CITY OF COLLEGE STATION, BRAZOS COUNTY, TEXAS REFERENCE: COLLEGE STATION DRAINAGE POLICY AND DESIGN STANDARDS STORM EVENT: I B I D I E I 5 YR STORM 76 8.5 0.785 47 0.78 0.00 7.69 7.69 48 0.80 0.00 7.50 7.50 49 0.82 0.00 7.31 7.31 50 0.83 0.00 7.12 7.12 51 0.85 0.00 6.93 6.93 52 0.87 0.00 6.74 6.74 53 0.88 0.00 6.55 6.55 54 0.90 0.00 6.36 6.36 55 0.92 0.00 6.17 6.17 56 0.93 0.00 5.98 5.98 57 0.95 0.00 5.78 5.78 58 0.97 0.00 5.59 5.59 59 0.98 0.00 5.40 5.40 60 1.00 0.00 5.73 5.73 61 1.02 0.00 5.12 5.12 62 1.03 0.00 4.72 4.72 63 1.05 0.00 4.39 4.39 64 1.07 0.00 4.12 4.12 65 1 08 0.00 3.87 3.87 66 1.10 0.00 3.65 3.65 67 1.12 0.00 3.44 3.44 68 1.13 0.00 3.26 3.26 69 1.15 0.00 3.09 3.09 70 1.17 0.00 2.93 2.93 71 1.18 0.00 2.78 2.78 72 1.20 0.00 2.65 2.65 73 1.22 0.00 2.52 2.52 74 1.23 0.00 2.40 2.40 75 1.25 0.00 2.29 2.29 76 1.27 0.00 2.19 2.19 77 1.28 0.00 2.10 2.10 78 1.30 0.00 2.01 2.01 79 1.32 0.00 1.92 1.92 80 1.33 0.00 1.84 1.84 81 135 0.00 1.77 1.77 82 1.37 0.00 1.69 1.69 83 1.38 0.00 1.63 1.63 84 1.40 0.00 1.57 1.57 85 1.42 0.00 1.51 1.51 86 1.43 0.00 1.45 1.45 87 1.45 0.00 1.40 1.40 88 1.47 0.00 1.35 1.35 89 1.48 0.00 1.30 1.30 90 1.50 0.00 1.25 1.25 91 1.52 0.00 1.21 1.21 92 1.53 0.00 1.17 1.17 93 1.55 0.00 1.13 1.13 94 1.57 0.00 1.09 1.09 95 1.58 0.00 1.06 1.06 96 1.60 0.00 1.02 1.02 97 1.62 0.00 0.99 0.99 98 1.63 0.00 0.96 0.96 99 1.65 0.00 0.93 0.93 100 1.67 0.00 0.90 0.90
R & S LEASING -COLLEGE STATION PROFESSIONAL BLDG TWO
CITY OF COLLEGE STATION, BRAZOS COUNTY, TEXAS
REFERENCE: COLLEGE STATION DRAINAGE POLICY AND DESIGN STANDARDS
STORM EVENT:
5 YR STOR M
101
102
103
104
105
106
10 7
108
109
110
111
112
113
114
115
50 .00
40 .00
20 .00
0 .00
0 .00
B D
76 8 .5
1 .68 0 .00
1 .70 0.00
1.72 0.00
1.73 0.00
1.75 0 .00
1 .77 0 .00
1 .78 0 .00
1.80 0.00
1.82 0.00
1 .83 0 .00
1.85 0.00
1.87 0 .00
1.88 0.00
1.90 0 .00
1.92 0.00
. 0 .50 1.00 1.50
E
0.785
0 .88
0 .8 5
0.82
0 .80
0 .78
0 .7 6
0 .74
0 .72
0 .70
0 .68
0 .6 6
0 .64
0 .63
0 .61
0 .60
2 .00
10/18 /05 10:33 PM
0.88
0 .85
0 .82
0 .80
0.78
0 .76
0 .74
0 .72
0 .70
0 .68
0.66
0 .64
0 .63
0 .61
0 .60
2 .50
I-+-Area 1 Runoff --Area 2 Pond Discharge -.-Total Post-Developm ent Inflow I
POND-2 Version: 5.21 S /N:
EXECUTED: 08-22-2005 15:16:36
********************************************
*
.*
*
*
*
*
R&S LEASING -CS PR OFESSIONAL BLDG TWO
COLLEGE STATION, TX
5 YEAR STORM
*
*
*
*
*
*
********************************************
Inflow Hydrograph: s :\engr\deta in\rsme d \5D EV .HYD
Rating Table file: s:\engr\detain \rsmed \RSMED .PND
----I NITI AL CONDITIONS ----
Elevation 305 .1 8 ft
Ou tfl ow 0.00 cfs
Storage 0 .00 ac-ft
INTERMEDIATE
Page 1
ROUTI NG
GIVEN POND DATA COMPUTATIONS
--------------------------------------------------------
ELEVATION I OUTFLOW I STORAGE I I 25 /t I 2S /t + 0
(ft) I (cfs) I (ac-ft) I I (cfs) I (cfs)
---------1---------1----------1 1------------1-------------
305.1 8 I 0 .0 I 0 .0001 I 0.0 I 0 .0
305 .43 I 0.0 I 0.001 I 1. 4 I 1. 4
305.68 I 0.3 I 0 .008 I 11 . 3 I 11.6
305 .93 I 0 .7 I 0.026 I 38 .1 I 38.8
306 .18 I 1. 4 I 0.060 I 86 .5 I 87 .9
306 .4 3 I 2 .5 0.105 I 15 2 .2 I 15 4 .7
306 .68 I 4.0 0 .164 I 237 .1 I 241 .1
306 .93 I 5.8 0.237 I 343 .6 I 349 .4
307 .1 8 I 8.2 0.324 I 4 69 .2 I 477 .4
30 7 .43 I 11. 0 0 .415 I 601 .8 I 612.8
307 .68 I 14.3 0 .511 I 740 .7 I 755 .0
307.93 I 18.1 0 .612 I 886.1 I 9 0 4 .2
308.18 I 22.5 0 . 717 I 1038 .6 I 1061 .1
308.43 I 27.5 0 .828 I 11 99. 5 I 1227 .0
308.68 I 33 .1 0 .945 I 1369.0 I 14 02 .1
308.93 I 37.9 1 .0681 I 1 547.4 I 15 8 5 .3
309.00 I 39 .3 1.1031 I 1599.0 I 163 8 .3
-------------------------------------------------------
Time i ncrement (t) = 0 .0 17 h r s .
S:\2005152805-291 R&S-medical\drain report \dra in report-R&S MED REVIS ED .doc
POND-2 Ver sion: 5 .21 S I N: Page 2
EXECUTED : 08 -22 -2005 15 :16 :36
Pond File: s :\eng r \detain \r s ed\RSMED .PND
Inflow Hydrograph : s:\engr \detain \rs ~ed \5DE V .HYD
Ou tfl ow Hydrograph: s :\engr \detain \rs ~e d \OUT .HYD
INFLOW HYDROGRAPH ROUTING COMPUTATIONS
-----------------------------------------------------------------------
TIME I INFLO\.'J I I Il+I2 25 ;::. -0 25 /t + 0 I OU TFL OW I L.,EVATION I
I (hrs) I (cfs ) I I (c fs ) (c:s ) (cfs) I (cf s ) I (ft ) I
1--------1---------1 1--------------------------------1---------1---------1
0 .00 I 0 .0~1 :.J 0 .01 0 . '.:') I 30 5 .18 I I
I 0 .0 17 4 .2C i 4 .2 ~.o 4 .21 0 .08 I 30 5 .5 0
I 0 .033 8 .4 21 12 .6 15 .9 16 .71 0.37 305 .73
I 0 .050 12 .72 1 21.1 35 .7 37 .ol 0 .67 305 .91
I 0 .067 17 .14 29 .9 63 .4 65 .6 1 1. 08 306 .07
I 0 .083 21 .76 38.9 99 .0 102.31 1. 64 306 .23
I 0 .1 00 26.66 4 8.4 142 .7 147 .4 1 2.38 30 6.4 0
I 0 .117 31 .91 58.6 194 .6 201.21 3.31 306 .56
I 0 .13 4 37.5 8 69.5 255 .4 264 .ll 4.3 8 306 .73
I 0.15 0 43 .26 80.8 325 .0 336 .21 5 .5 8 306 .90
I 0 .167 4 8 .49 91.8 4 02 .7 416 .81 7.06 307.06
I 0 .184 47.2 8 95.8 4 8 1. 2 49 8 .41 8 .64 307 .22
I 0 .200 45 .9 1 93.2 553 .9 574.31 1 0.21 307 .36
I 0 .217 44 .41 9 0 .3 620 .8 644.3 1 11.7 3 307 .49
I 0 .23 4 42.83 87 .2 68 1 .6 708.ol 13. 21 307.60
I 0 .2 5 0 41 .17 8 4.0 736 .5 765.61 14.57 307 .7 0
I 0 .267 39 .45 80 .6 78 5.3 81 7 .ll 1 5.88 307 .7 8
I 0 .284 37 .67 77.1 828 .4 862.41 1 7.04 307.86
I 0 .301 35.84 1 73 .5 8 65 .8 9 0 1. 9 I 1 8 .04 307 .93
I 0 .317 33.96 1 69.8 8 97 .6 935.6 1 1 8 .9 8 307 .98
I 0 .334 32.04 1 66.0 924 .1 963.6 1 1 9 .77 308.02
I 0.351 30 .081 62.1 945 .4 9 8 6.2 1 20 .4 0 308 .06
I 0. 367 2 8 .091 5 8 .2 961. 8 1003 .6 1 2 0 .89 308 .09
I 0.384 2 6 .05 54.1 973.5 1 016 .ol 21. 23 308.11
I 0.401 23 .99 5 0 .0 980 .7 1 023.51 21 .45 308 .12
I 0.417 21.89 45 .9 983 .5 1 026.51 21 .53 308.12
I 0.434 19.76 41. 7 9 82 .1 1 025.ll 21.49 308.12
I 0.451 1 7.59 37.4 976 .8 1 019.51 21 .33 308 .11
I 0 .468 15 .39 33.0 967.7 1009.8 1 21.0 6 30 8.10
I 0.484 13 .16 2 8 .6 954 .9 996 .21 20 .68 308.0 8
I 0.501 10 .89 24.l 938 .5 97 8 .91 20 .19 30 8 .05
I 0.518 10.71 21. 6 92 0 .8 96 0 .ll 19 .67 30 8 .02
I 0.534 10 .52 21. 2 903 .7 942 .01 19 .16 30 7 .99
I 0.551 10 .33 20.9 887.2 924.61 1 8 .67 307 .96
I 0 .56 8 10 .14 20.5 8 71.3 907.71 1 8.20 30 7 .94
I 0.584 9 .95 20.1 8 55.8 891. 4 I 17.77 307.91
I 0.601 9 .76 19.7 8 40.8 87 5 .51 1 7.37 307.88
I 0 .61 8 9.58 1 9 .3 82 6 .2 860 .ll 16 .9 8 307.86
I 0.635 9.39 19.0 812 .0 845 .2 1 16.60 307 .83
I 0.651 9 .20 1 8.6 798 .1 830.61 1 6.22 307.81
I 0.668 9.0ll 18.2 784 .6 816.31 15 .8 6 307 .7 8
I 0.6 85 8.821 17.8 771 . 4 802.41 15.51 307.76
I 0.701 8.631 17 .5 758.5 7 88.91 15.16 307.7 4
I 0.71 8 8.441 17.1 746.0 775.61 1 4.82 307.71
I 0.735 8.251 16.7 733.7 762.61 14.49 307 .6 9
-----------------------------------------------------------------------
S :\2005\52805-291 R&S-medical \drain reportl drain report -R&S MED REVISED .doc
PONu-2 Vers ion: 5.21 S /N:
EXE CU TED: 08 -22-2 00 5 15 :16 :36
Po~d File: s :\engr \detain\rsmed \RSMED
In:~ow Hydrograph: s :\engr \detain\rsmed \5DE V
Outflow Hydrograph: s :\engr \deta in \rsmed \OUT
.PN D
.HYD
.HYO
IN?~OW HYDROGRAPH ROU TING CO MPUTATI ONS
Page 3
~=ME INFLOW I Il+I2
(cfs )
2S /t -0 I 2S/t + 0 I OUT FL OW !ELEVATION !
:-.rs ) I (cfs) I
-----------------!
: . 7 s:
:.76 8
C .785
C .8 02
C .81 8
C .835
0 .852
.868
.885
0.902
0 .918
0 .935
0 .952
0 .969
0 .9 85
1 .002
1 .019
1.035
1.052
1 .0 6 9
1 .086
1.1 02
1.119
1 .136
.152
1.1 69
1 .1 86
.202
1. 219
1.236
_.252
1. 269
1. 286
1 .303
1. 319
1. 336
1. 353
1. 369
1. 386
1.403
1. 419
1. 436
1.4 5 3
1 .470
1. 486
1.503
8 .06'
7.88
7 .69
7 .5 0
7 .3 1
7.12
6 .93
6 .74
6.55
6 .36
6.17
5.9 8
5 .78
5.59
5 .4 0
5 .73
5 .1 2
4.72
4 .39
4.12
3 .871
3 .651
3 .441
3 .261
3 .091
2 .9 31
2 .7 81
2 .651
2 .5 21
2.401
2.291
2 .191
2 .101
2 .011
1. 92 I
1. 84 I
1. 77 I
1. 69 I .
1 .631
1. 5 7 I
1. 51 I
1. 45 I
i. 4o I
1. 35 I
i. 30 I
1. 2 5 I
16 .3
15 .9
15.6
15 .2
14 .8
14 .4
14 .1
13 . 7
13 . 3
1 2 .9
12.5
1 2 .2
11 .8
11. 4
11. 0
11.1
1 0 .9
9 .8
9.1
8.5
8 .0
7 .5
7.1
6.7
6.4
6 .0
5.7
5.4
5 .2
4.9
4.7
4.5
4 .3
4.1
3 .9
3.8
3.6
3.5
3 .3
3 .2
3.1
3.0
2. 9.
2.8
2 .7
2 .6
(cfs ) I (cfs) I (cfs) I (ft) I
------------1-----------1---------'---------l
7:2 2_. 6 I
709 .8 I
698.1
686 .6
675 .3
664 .2
653 .2
642.3
631.7
621 .1
61 0 .6
600 .3
59 0 .l
5 80 .0
569.8
56 0 .3
55 0 .9
540 .9
53 0 .6
52 0.1
509.6
499.1
4 88 .6
478 .2
467 .8
457 .6
447.4
437 .4
427.4
417.6
408.0
398 .5
389.2
380.1
371.1
362.3
353.7
345 .3
337 .0
328.9
321.0
313 .2
305.5
298 .0
290 .7
283.5
750 .01
737 .51
725.31
713 .31
701.41
6 89 .71
678 .21
666 .9 1
655.61
644 .61
633 .61
622 .81
612 .ll
601.51
590 .9
5 8 1 .0
571 .1
560 .7
550.0
539.1
52 8.l
517.l
5 06 .2
495.3
484.5
4 73.8
463.3
452.8
442.5
432.3
4 22 .3
412.5
4 02 .8
393.3
384.0
374.8
365.9
357.1
34 8.6
340.2
332 .0
323 .9
316.0
308 .3
30 0 .7
293.3
14 .18
13 .9 0
13 . 61
13 . 33
13 . 06
1 2.7 9
1 2.5 2
12.26
11. 99
11 . 74
11. 4 8
1 1. 23
1 0 .99
1 0 .77
1 0.55
1 0 .34
1 0 .14
9.92
9.7 0
9 .4 8
9 .25
9.02
8 .80
8.57
8 .35
8 .13
7.94
7.74
7.55
7.36
7.17
6.9 8
6.8 0
6 .62
6 .45
6 .2 8
6 .11
5 .95
5.79
5 .65
5.51
5.3 8
5.25
5.12
4.99
4.87
307 .67 I
307 .65 I
307 .63 I
307 .61 1·
307 .59 I
307.57 I
307.55 I
307.53 I
307.51 I
:307 .49 I
307 .47 I
307.45 I
307 .43 I
307 .41 I
307 .39 I
307 .37 I
307.35 I
307 .33 I
307.31 I
307 .29
307.27
307.25
307 .23
307.21
307 .19
307.17
307 .15
307 .13
307.11
307 .09
307 .07
307.05
307.03
307.02
307 .00
306 .9 8
306 .96
306 .95
306 .93
306 .91
306 .89
306.87
306.85
306.84
306.82
306.80
S :\200515 2805-291 R&S-m edical\drain reportl dra in report-R&S MED REVISED.doc
POND-2 Version: 5 .21 S /N: Page 4
EXE CUTED : 08-22 -2005 15:16:36
Pond File : s :\engr \deta in \rsmed \RSMED .PND
.H YD
.HYD
Inflow Hydrograph: s :\engr \de t a in \rsmed \5DEV
Ou tfl ow Hydrograph: s:\engr \detain\rsmed \OUT
INFLOW HYDROGRAPH
TIME I
(h rs ) I
1--------
! l .52C.
I 1 .536
J 1 .55 3
I 1 .57 0
I 1.5 8 6
1.6 0 3
1 .62 0
1 .637
1 .65 3
1 .67 0
1 .6 87
1.7 03
1 .720
1.737
1.753
1 .77 0
1.787
1 .8 0 4
1 .820
1 .837
1.854
1.87 0
1.8 87
1 .9 04
1.9 20
INFLO W I
(cfsl I
l. ":':
l .17 f
1 .13 J
1.0 9 1
1.0 6 1
1 .02 1
0 .99 J
0 .96 J
0 .93
0 .9 0
0.88
0.8 5
0 .82
0.80
0 .7 8
0 .76
0 .74
0 .72
0 .70
0 .6 8
0.66
0.64
0 .63
0 .61
0 .6 0
ROUT I NG COMPUTATIONS
Il+I2 2 5 /t -0 I 25 /t + 0 I OUTFL OW !ELEVATION !
I (cf s) I (cf s ) I (cfs} I (cf s} I (ft ) I
1---------1------------1-----------1---------·---------I
2 .5 I 276 .5 286 .0I 4 .75 30 6 .7 8
2 .4 269 .6 2 7 8 .9 J 4.63 30 6.7 7
2 .3 2 6 2 .9 271.9 4.51 306 .75
2 .2 2 56 .3 265.1 4 .40 306 .7 4
2 .2 249 .9 258 .5 4 .29 30 6.72
2 .1 243 .6 252 .0 4 .18 306.71
2 .0 237 .5 245 .6 4 .08 306.69
2 .0 231 .5 239 .4 3 .97 306.68
1. 9
1.8
1.8
1.7
1.7
1.6
1.6
1.5
1.5
1.5
1 .4
1 .4
1.3
1.3
1.3
1 .2
1 .2
22 5.6
219.9
2 14.4
209 .0
203 .7
1 98.6
193.6
188 .7
184 .0
179.4
174.9
170.5
166.2
162.1
158.1
154.2
150.3
233.4
227 .5
221 .7
216 .1
210 .6
205 .3
200 .l
195 .1
19 0 .2
1 8 5.4
1 80 .8
17 6.3
171.8
1 67 .5
1 63 .4J
1 59 .31
155 .41
3 .87
3 .76
3 .66
3.57
3.47
3.38
3 .29
3.20
3.1 2
3 .03
2 .95
2 .87
2 .80
2.72
2 .65
2 .5 8
2.51
306.66
306.64
306.62
306.61
306 .59
306.5 8 I
306 .56 I
306.55 I
3o6.5 3 I
306.5 2 1.
306.51 I
3o6 .49 I
306.48 I
306 .4 7 I
306 .46 I
306 .44 I
306 .43 I
S:\2005152805-291 R&S-medical \drain report\drain report-R&S MED REVISED .doc