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

MTlCIW. FCRUA C .. .48
I- 4.51NCHES/IilJI.
A.. 62.1 ACRES
Q" 136. CFS
U.O F CO. ClW RlMH AHAlYSIS EXECUTED ()t DATE

awE/PC vERSli:W ,II))!FIEO IN JAM..WlY 1985

~INT Cl'Tla. IUt3[R SElECTED f(>>l: THIS BASiN IS

8lJ.ltt:..tD GlOt; lOO.YR: FE"'" FIS: 8125/91 (BHIOOfIJ.CHI>a<kKAIiC/pondJ

AT TIME

BASI" rD. 41

.. BASJNC()t(H'T: SLe8ASIH 10-41

AREA Cf BASIN weiTH Cf BASIN OIST TO CEHTROID It<<RVIOOS MEA Sl<PE !.NIT lX.RATIOt
(SOtIl (1m (M!) (PeT) (FT/FT) (HIN)

06

.49

.26

2.00

0190

5,00

CCl:FFICIEHT COEfFICIENT
(REFLECTING mE TO P[N:.) (RELATED TO P(Aj( RATE CF Rl..K:f'F)
.156 .220

CAlCl..l..uro LNIT 1ff0R00W'tl

rut: TO PEAK TUt: Cf CCKEIfTRATICJt PEAl RATE Cf Rl..N:ff lMlT ~ PEAl VClLK CF AlJO'f
UUN) UUN) <CfS/S(JIJ) (CfS) (~)

7.01

ROO

1874.39

116.21

3.31

..... I<<lTE ; TtE T1~ TO PEN:. IS CAlD.1.ATEO BASED (It M: mE Cf CCIlCEHTAATI(JI PROVIDED BY TlI: USER.
REPlACING TIE: ()E CClf'tIfEO BY Cltfl) (TP- 11.49)

WIDTH AT 50" 16. HIN. W!OfH AT 7S.. 8. HIN. GO" .26 K75".36

RAINfAll LOSSES ItflUT WI BASIN OATA

f'IoU. PERYlOOS RET. .. .40 IN. 1"IoX. UftRYHIJS RET. .10 IN.
INftLT'RATlOt .. 4.50 IH./lft DECAY" .OOlSO/SEClJ(I FNINFL".60 IH./IfI.

mE !JIlT TIlE !JIlT TIlE !JIlT
H'IlIltG!APH HY1lROOW'H HYooo:;l!APH
o. o. 25. 41 so. 10.
5 104. 30. 31 55 8
10 101. 35 l4. 60. 0,
IS. 75. 40. 18. o. o.
20 54, 45, 14. o. 0,
BASlHID: 41 .. BAS!N CCI'tIENT: SLe8ASIN !I>- 41
-ST()lt1/1)." - DATE CR RET1...P.H PERlOO .. lOOY(AA
IHCl!EIENT TOTAl IT"'" rNCREJ'l[NT TOrN. IT"'"
HIE RAINFAll EXCESS HY"""""" HIE RAINfAlL EXCESS HYooo:;l!APH .
(~rN. ) (iN) PREC!P (CFSl <MIN.) (IN) PRECIP <CFS)
00 .000 o. IS 11 .058 55.
5. 03 000 0 60 .11 .058 56.
10. 08 .000 o. 65. .11 05' 50.
15 12 002 0 70. .05 005 3',
20. 21 004 I 75. .05 .GOS 30.
15. 38 .023 J. 80. .03 .001 23.
30 58 .609 66. 85. .03 .001 14.
35 .38 .319 97. 90 03 .001 8. .
40. .21 .161 %. 95. .03 .001 6.
45 17 .115 87. 100. .03 .lIOl 4,
so, 14 084 16. 105 .03 .001 2.

TOTAl PRECIP." 3.12 IHO..ft RAIN.. 2.701 [XECESS PREC!P .. 1.508 INCHES
'IQtK (f' EXCESS PRECIP .. 5 ACRE-FEET
PEAt Q.. 97. Sf 5 TIME OF PfAA" 35. MIN.
INflU"".301HlffI. OECAY.00180 FN[NF.. 601N/tfl
W.?ERV.MT.. ~o rHo I1AX.IHP.RfT," .HI IN

'lATJCJW..!JlJ1.UC. 48
I .. 4.8 INCHES/H),R
A" 39.7 ACRES
a.. 9Z.CFS
U.iH co. ClW RtJ()fF AlW.YSIS EXECUTED ~ OATE AT T11'f:

QHlEIPC VERSI~ IUHflfD 1N JNtlARY 1985

32