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 BH I OOFI3.CHO

CUft/PC 'ifRSICM .IUlIFI[O IN J~Y t985
PRINT (PTlI)1 IrlIe(R SELECTED FCR THIS WtN IS 7
8U..ll-€AD G.lCM: tOO.vR: FEHA F1S: 8/25/97 (8HI00FlJ.CH[)4dcKAGC/p00d3

BASIN [0: 65

llASIN(t)t1ENT: SL8llASIN[[)-6S

MEA (J BASIN LENGTH Of BASIH OIST TO CENTROID Ufl(RVItl./S AREA SUPE I.ItIT ll.RATlCW
(SCJtIl {HIl Uti) (PCT) (FTiFTl <"'IN)

.13 .43

.15

40.00

.0050

5.00

CCE:FFlCIEHT
(REflECTING mE TO POlo)

C((FFICIENT
(RELATED TO PEAK RATE (f RUaF)

.D9J .382

CN..ULATEOIJlIT HY(Il(XiJI.APH

TIlE TO PEN:. WE (f ClXENTRAT!()f p[A1( RATE (J RlJ(fF I.ItIT HYlmiRAPH PEM Ya.ltE (F RlJ(fF
(HIN) UtlH) (CFS/$O'tI) {(FSl (Ai)

9.14

23.00

6.67

2208.39

276.05

- p(JTE : M TIlE TO PEN:. IS CAlCll.ATED BASED '* Tl-E TnE IF COCENTAATItN Pf(NIDED BY 1lI: IJS[R.
REPlACIHG TtI: CJE COt'UlID BY ClJfllI (Tfl'- 7.85)

WIDTH AT SO.. 14. HIN. WlDllt AT 75" 7. HIN. K.5O".35 K75".45

RAINFAll UlSSES INPUT W/ BASIN OAT"

IW. PERYlCUS REf. .. .40 IN. M.X. IIfIERvta.rs RET. .10 IN.
IPf'llTRATI()f .. 4.44 [H./Ifl.. Of:CAY" .OO180/SEC(J() FNINfl".60 IH.lIfl..

111'{ J.N17 111'{ J.N17 111'{ J.N17
HY_ HY_ """"""'"
O. o. 15. 81 SO. 11.
5. 165. 30. 55. 55. 8.
10. l72. 35. 38. 60. O.
15. 18<). '0. 16. O. O.
10. lIS. 45. 18. O. O.
BASIN 10: 65 .. BASIHCOtIENT: SLIlBASINID"65
-.5T()lM~.- I ClATE CA RETLRtC PERIOO .. lOOYEN!
IN<REJ1(Nf TOTAL ST"'" IHCREtt:NT TOT... ST"'"
HI'{ RAINFAlL EXCESS HYIlROGRAPH HI'{ RAINFAlL EXCESS HYIlROGRAPH
(HIN.) ClN) PRECIP (CFS> (HIN.> (IN) PRECIP {CFS>
O. .00 .000 O. 75. 05 .023 68.
5 .03 .000 O. 80. .03 .(J12 51.
10. .08 .003 I. 85. .03 .012 35.
IS. 11 .J)47 9. 90. .03 .012 16.
10 11 .081 17. 95. .03 .(J12 11.
15 38 .154 57 100. .03 .(J12 17.
30. .68 511 165. I(JS. .03 011 15.
35 .38 J3S 266. uo. 03 .(J12 14.
40. 11 .178 26(J. 115. .03 .012 :3.
45 17 131 223. 120. .03 011 11.
50 14 .101 187. 125. .00 .000 10.
55. 11 .075 155. 130. .00 .000 7.
60 .11 075 L29. 135. .00 .000 4.
65. .11 .076 Il2. 140. .00 .000 3.
70. 05 013 91. 145. .00 .000 1. .
TOTAlPRECIP. 3.12 (1-1t:lR RAIN '" 2.70) EXECESSPRECIP -2.037 IHCHES
'IQ.LttE~EXCESSPREClp. I'. ACRE-FEET
"^" Q. 266.CFS TIP'( OF PEAK .. 35, MIN.
[NfllT.. ~.44 iN/~ DECAY'" 00180 FNlijF. .60 IN/~
!'tAX.PERV.FlH.. 40 IN. HAX.llfl.REi... ,10 rN.

RATlCHAl. FCRIUA C .. 55
I. ~.9[NCHES/~
A . 80. 0 ~CRES
a. 257.CFS
u.D.F,C.D. ClJiP RI.IO'F AHALYSIS EXECUTED CW DATE

IJ.JlPEIPC I/ER$lC>>t I'IXl!FIEO IN JANUARY 1985

PftINT IPTllJt If..Ml[R SELECTED F(Jl TIm BASIN IS 7

AT TUO(

55