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 BHI00FI3.CHO

8lJ.ltEAi) W.CH: tOO.YA; fEM F1S. 8/25/97 (8HI00fIJ.OHlldltlUafpondJ

BA$INIO' 66

BASIN C()t(NT' Sl.88A5IN 1000 66

!\IlEA cw: BASIN lEt<<iTH C# !lASlN om TO CENTROID II'f'ERVIWS AAEA SlOPE LMIT tt.RATtOt
(S()IIJ (MIl (Hll (PeTl (Fl/FT) (HIN)

08

"

.11

20.28

.0030

5.00

CCHflCIENT CClFFlCIENT
(REFlECTIMi WI{ TO PEM) (RELATED TO PEM RATE IF Rl.Kf'Fl

.HO

.220

ULClLATED !.Mil HYtIIOOlAPH

TIME TO F'EM TlHE IF C~Ct:HTRATI<* PEAK RATE C# Rl..fraF lMIT HYORCGRAPH ~ Vll.lt€ CE RI.II:FF
(11IN) HtlN) (CFS/S(J1ll (CFSl (AF)

5.92

2476.66

20.00

198.13

4.27

"** IllTE ; T'HE TIME TO P[AJ. IS CAlC11.ATED BASED ~ M TIME (J" CCN:EHTRATI()I PAOYIDED BY 1l€ USER.
REPlACHG nt: \JlE aJflUTED BY QH'O (TP- 9.27)

WIDTH AT 50.. 12. HIN. WIDTH AT 75" 6. MIN. K50".29 K75".40

RAINF.fLL LOSSES INPUT W/ BASIN DATA

MAX. PERVlOOS RET. .. .40 IN. HAX. If'IlEAvlWS RET. .10 (N.
INFtLTRAlIOt .. 3.00 IN.lIfl. ll(CAY.. .OOl80/SEC()I) fNINFl".50 IN.llfI:.

71" LNIT 71" LNIT 71" LNIT
H'1UROOW'H """"""" HY"""","
o. o. 10. ". 40. 13. .
5. 192'. 15. " 45. 9.
10. 146. 30. 19. 50. O.
15. 95. . 35. 10. o. D.
BASIN 10: " .. BASIN ())tENT; SlIlBASIN 10- 66
....... ST()l,H NO. . ~~ DATE (II. RET1.RH PERlOO .. lOOYEAA
INCREHENT TOTAl. SflR< INCREMENT TOTAl SflR<
71" RAINFALL EXCESS HYJ>lOGAAPH 71" RAINFAll EXCESS tfflJltGlAPH .
(M!N.) <IN) PflfCIP (CFS) (HIN.) (IN) PRECIP ((1"5) .
.
o. .00 .000 o. 65. .11 .073 65.
5. .03 .000 Q. 70. .05 .020 48.
10. 08 .002 o. 75 .05 010 33
15. 11 01' ; 80. 03 .006 11.
10. .11 041 11 as. .03 .006 15.
15. 38 144 36. 9Q. .03 .006 10.
30 .68 .626 147 95. .03 .006 8.
35. 38 336 173 100. .03 .006 ..
'0 11 .178 154. 105. 03 .006 5.
45. 17 131 UI. 110. .03 00. ,
50. .14 099 109 us. 03 .006 ,
55. .11 073 39. lZ0. .03 .006 ..
50. 11 073 75 125. .00 .000 3.
roT.&J.PRECIP.- 3.1Z(I.I-O.JIAAIH- 2.70) EXECESSPREClP. .1.898 rHOfS
~a..iJ( OF EXCESS ?!l:ECIP - 8. ACRE.FEET
PEAAQ- 173. CFS mE Cf PEAK. 35. MIN.
INFILT."3.001Nftfl. DECAY - ,00180 FNIHF'" .50IHfrll
MAX.PERV.RET.- ,40 IN. ~.IHPRET.'" .10 IN.

RATICfW. FCIM.tA C - .61
I - 5.3 IN(tfS/I{lR
A'" 51.2 ACRES
Q. 165. CFS
lJ.D.F.C,D. ClJiP R1J()fF AtW.V51S EXECtITED CJl DATE

ATTIHE

Cl.tiPEiPC ~ERSION ~tF[ED IN JAHJAAV i985

PR!NT CFT!()f NtHlER SELECTED Foo. THIS BASIN {S 7
BU.LHEAO !UCH; IOO.'fR; FE/'lA FrS: 8/25/97 (BH100FI3.(HfladdH&AGC/pondJ

BASIN 10: 67

BASIN C(Jt(NT. SlB8ASIH l~ 67

56