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 BH100FI3.CHO

65
10
"

. os.
OOS
005

.000
.000
000

5
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143.
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llJ

!45
150
155.

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00
.00

11
OS
OS

TOTAl PRECIP. .. J.IZ (I.fUR RAIN.. 2.70) [X[(ESS PRECfP .. 1.508 [NOES
nlJ1E lJ" EXCESS PRECIP .. 14 ACRE.fEET
PEAK Q.. t96. CFS mE ~ P€.4I." 45. HIN.
(MFILT.- 4.50 tN/~ DECAY" .00180 fNINf'" .60 !M/ff!.
MAX.PERY.RET....40IN. HAX.tlf'.RET.-.IOIN.
U.D.f.C,Q. CIJfI Rl..laF AlW.YSIS EXECUTED (W DATE AT TIME

CtJPE/PC YERS[~ I'IDIFIED [N JNlL&AY 1985
PRINT CPTICW ttJtlf:R SELECTED FCR THIS BASIN IS
BlLUENlQl.CIi: lOO.YR; FEHA F15: 8/25/97 (BHlOOfIJ.CHDadlli&AGC/p0nd3

BASIN 10: 40

BASIN C[)ttENT: SlMASlN 11)00 40

AREA Cf BASIN LENGTH OF BASIN OIST TO CEH1R(JIO IIf'ERVIClIS MEA SUYE tJnT CJ.RATItw
(S(J11) (Hll (HIl (Pel) (FT/FT) (HIN)

.10

.57

.36

5.00

1.00

.0250

COCFFICrEHT COEFFICIENT
(REFlECTII<<i Tn€ TO PUll (RELATED TO PUt. RATE (f Al..lraFl
.156 ,/36
CAla.LATED tJllT HYtlPOOW'H

TU€ TO PEAK TIME (J" COC[HlllATICW PEN:. RAft: OF Rl..t<<J"F IIHT HY[Il:(XiRNIH PEAK Wl.1JI( II" Rl.IO'F
n1!N) n1!N) (CF$/S()1J) (as) (If)

7.57

27.00

174.79

5./3

1783.57

*** J<<JTE : Tlf TIME TO PEN: IS CALCllATEO BASED (J4 TIE TUE (f' ClKEKTRATUJ4 PROYIIG BY nt: USER.
REPlACING TtE M CQIlUTEO BY ClJflO (11)- 13.(8)

WIDTH AT 50" 17. MIN. WIDTH AT 75 - 9. HIN. !GO" .27 105 - .37

RAINfALL LOSSES HflUT WI BASIN DATA

IW. PERVIWS RET. .. .40 IN. 1'toU. IPFERVIWS REI. .10 IN.
fNfIlTRATIa. - 4.50 [N./KI.. DECAY - .OOIBOISECCMI fNINfl".60 IN.lK!..

TIME "'IT TIME "'IT TIME "'IT
flYCi!OOW'H flYDROOlAPll HY1lROOW'If
0, o. 15. 66. 50. 16.
5, 143. 30 50. 55. 1/.
10. 161 J5 38 60. .
15. 119 40. /9. 65, o.
/0. 87. 4S II. o. o.
BASINlD: 40 .. BASIN CClKNT: SlJ!8ASIN[D-4Q

"-STlJlH~.- DATE CR RET~ PERIOO " 100YEAR
ItrnEMENT TOTAL ST"'" INCREMENT TOT.. ST"'"
TIME RAINFAlL EXCESS flYCi!OOW'H TIME RAINfAlL EXCESS flYCi!OOW'H
(MIN.) (IN) f)RECIP (CfS) (MIN.) (IN) PRECIP (CFSl
o. .00 .000 o. 60 11 058 88.
5. .03 .000 o. 65. .11 OS, 78,
10. .08 .000 o. 70. OS 005 6/.
15. 1/ .002 o. 75 .OS .005 48,
/0. .11 .004 1 80. .03 .001 J6,
25 .38 .023 4. 85. .03 .001 17.
30. 58 .609 95. 90. .03 001 17.
J5. 38 J19 148. 95 .03 .001 10.
40. II .161 150. toO. .03 001 7
45. 17 115 IJ5. toS. 03 001 4.
50 .14 084 119. 110 03 .001 J
55 11 ", 102. 115 03 001 I.
TOTftLPRECIP. .. 3.12 (l-I-IU RAIN .. 2.70) EXECESSPRECIP. "1.508 INOE5
'lQiJ'IE iF EXCESS PRECIP " , ACRE. FEET
PEAKQ.. l50.CFS WI[ iF PEAK" 40. MIN.
[NfllT."4.50lN/!fl. DECAY" ,00180 FNIHf" 60lN/K!.
/'W,f>ERV.RET." 40 IN. IW..IHP.RET," .10 IH.

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