FLOOD02246

• County: Boulder
• Community: Boulder
• Stream Name: Bullhead Gulch
• Basin: South Platte
• Title: Bullhead Gulch Hydrology Report
• Date: 8/22/1997
• Prepared For: FEMA
• Prepared By: Taggart Engineering Associates, Inc.
• Floodplain - Doc Type: Floodplain Report/Masterplan

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August 25,1997 BHIOOFI3.CHO

WIDTH AT 50" t3. HIN WIDTH AT 7S" MIN. KSO.. .Z9 IUS" .39

RAINFAlL LOSSES INPUT III BASIN DAfA

I'lAX. PERI/1M Il.ET .. 40 IN. tw.. IJflERVlllJS RET .10 IN.
IHf{URAf!Ctt .. 4.50 IN,/1<<. DECAY" .ODI80/SECCHl FNINFL".60 IN,/tfI:.

TIME "'" liME !.NIT TIME !.NIT
HY(ID;RAPH HY(ID;RAPH HY(ID;RAPH
O. 0, 20. 49, 40. 11,
5. 134, 15, 34, 45. a,
10. lOS, JO, 14, 50 O.
15. 71. 35, 17. O. 0,
BASIN [D: JJ .. BASIN aJtllNT: SL88ASIN [[)oo 33
-- STOOH NO. .. DATE 00 RETtRN PERIOO .. lOOYEAA
!NCR&(NT TOTAl 5T(JlIl [NCREtlNT TOTN.. 'T(JlIl .
TIME RAINFAlL EXCESS HYlIAl);RAPH TIME MINF.6LL EXCESS HYlIl<lGIWH .
(HIN,) (IN) PAECIP (CFSl . {MIN.l (IN) PAECIP (CFSl .
. .
O. .00 .000 O. 50, ,14 .... /2, .
5. .03 .000 0, . 55. ,11 .058 59.
10. ,08 .000 0, 50. .11 ,058 49. .
15. .1/ ,001 O. 65. .11 ,059 43. .
20. .21 .... I. 70. .OS .005 JI.
15, ,J8 .023 4, 75. .05 ,005 19, .
JO. .68 .609 84. 80. ,OJ .001 11.
35. .J8 .J19 "" 65, .OJ .001 7,
40, .21 .161 99 go. ,OJ .001 4. .
45 17 .115 86 95. .OJ .001 J,
TOTAl PRECIP. .. 3.12 (l-tO..R RAIN" 2.70) (XECESSPRECIP. .. 1.S08 I00E5
va..ttE CF EXCESS PRECIP - 5. ACRE.FEET
P{AK Q . 109. CFS mE IF PEAK - 35.I'UN.
IMFILT.- 4.50 IN/1<< DECAY" .00180 FNINF- .60IN/Ifl.
1W.Pf:RV.RH.- AD IN. f'W.I"".RET." .10 IN.

RATICJW. FlJlIt.LA C . .48
1- 5.411rlOE"$/to..R
A- J7.8ACRES
Q.. 99. CFS
U.D.F.C.D. CLHP Rl.N:fF ANoILYSIS EXECUTED ~ OATE

(l.H)E/PC VERSI~ ~IFIED IN J.AH.JAAv 1985

PRINT OPTlCtt tU'8ER SELECTED FeA. THIS BASIN IS

BLllHUD 1ll01: 100.YR; FEI1A FlS; 8/25/97 (BH100FI3.0HlddlJl&AGC/pondJ

AT TIlE

BASIN lD: J4

BASIN CCH1ENT: SL8BASIN W" J4

AAfA Cf BASIN LENGTH Cf BASIN DIST TO CENTROID IIfl:RVJ(l.lS ARfA SltFf: LNIl [l.RATI(Jrt
(S()11J (11i) (111l (PCT) (FT/FT) (11IN)

11

.50

.JI

2.00

.0140

5,00

CCHFICIEHT CIXFFICIENT
(REFlECTI~ TIME TO PEAK) (RELATED TO PEAK RATE OF RlHJfF)

156

143

CAlCll.ATEDUNITHYOJ!()'1lAPH
TIME TO PEAK TIME OF COCEHTRATlOO PEAK RATE Cf Rl.NJFF am HYDP:OOW'H PEAK VCllK Cf RlHFF
(11IN) (111N) (CFS/S()11J (CFS) (N)

7.20

25.00

1991.31

242.94

5.51

-- I()TE THE TIME: TO PEAl( IS CAlCllATED BASED C>>t THE WE Of ~CENTRATI(Jt PROVIDED BY TIE IHR.
REPlACING THE ()lE CCJ1PUTEO BY CUiPll <TP" 13.13)

'lIDTHAT50" is.I4IH \oj!OTHAT75"

I4IN. KSO".29 K7S-.39

RAIHf~L LOSSES rNPUT ..I BASIN OATA

MAX. PERV!(lJS RET ".40 iN. I1AX. IMPERVlllJS REI. 10 IN.
INFILTRATlOO " 4.50 UUtfl:. DECAY" .OOlBO/SECt)<<) FN1HFL" .60 IH./tlt

25