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

Wlont AT 50" 18. I1IN WIDTH AT 15.. 10. I1IN. 1tSD.. .J5 IU5" .45

RAINFAlL LOSSES IHPUT '.4/ BASIN o,t.TA

IW. ~RV[M RH. ... 40 IN. ~_ Itt>(RV!OOS RET 10 IN.
lHFILTRAH~ .. 4.50 IN_/~. DECAY" OOlSO/SECOO FNINfL" 60 IN./lfl..

TU. LOIT TI" LOIT TI" LOIT
HY_ HYiOOGRAl'Ii H'I1IROOW'H
o. o. 30. 73. 60. 14.
,. 122. 35. ss. OS. II.
10. 211. . 40. 42. 70. 8.
I'. IBO. 4S. 32. lS, o.
10. 130. 'II. 24. 0, o.
ZS. ". ss. 19. o. 0,
9ASINID: 47 u BASIN (()f1ENT: Sl.88ASIN 10- 47
-ST(JlMI(J.- .- Q,t,TE (R RE1l.RN J'ERIOO .. lOOVEAR
INCRIl(HT TOT.... ST"'" IHCREt(HT TOTAl. ST"'" .
Tit( RAiNfALL EXCESS H'I1IROOW'H TII1E RAINFALL EXCESS H'I1IROOW'H .
("IN,) <IN) PRECIP (CfS) (HIN,) (IN) PRf:CIP (Cf'S) .
.
.
o. .00 .000 o. 80. .03 ,012 72, .
,. ,03 ,000 o. 1l5, .03 ,012 57. .
10. .00 ,003 o. 90. .03 .012 46, .
I'. .12 .044 6. ". ,OJ .012 37.
10. ,22 .077 19. 100, .OJ .012 27. .
ZS. .38 .145 42. 105. ,03 .012 21. .
38. ,68 .621 126. llD. .03 ,012 18,
35, ,38 ,334 212. US. .03 .012 16.
40. .22 .177 233, 120. .03 .012 14. .
4S. ,17 .131 216. 125. ,00 .000 12.
SO. .14 ,100 191. 130. .00 .000 9. .
ss. ,11 .Q74 166. 135. ,00 .000 6.
60. ,11 .074 145. 140. .00 .000 4,
OS. .11 .074 128. 145. ,00 ,000 3, .
70, ... .022 llO. 150. .00 .000 2,
75. .05 ,022 89, ISS. .00 .000 2. .

TOTAl PRECIP... 3.12 (l-fO..R RAIN" 2.70) [XECfSS PREeIP. .. 2.000 IHQ€S
Wl.LKCF EXCESSPRECIP- 14. ACRf.FEET
PEAK Q.. 23J. CFS mE CF PEN:.... 40. HIN.
INfILT.- 4.50 IN/If( DECAY" .00180 FHINF".6O IN/If(
!1AX.PERV.RET.- .40 IN. 1W.IIfl.RET.- .10 IN.

AATlCJW.. FCIlH..LA C .. .54
! .. 4.2 [NQ(S/tOJl
A- 83.8ACRfS
Q.. 227. CfS
U.O.F.C.D. CltF RtM:fF iWLYSIS EXECUTED 114 DATE AT TIME

ClJf>EIPC ~ERSI~ ItDIFIED IH JAHJARY 1985
PRINT WfICN /U'IlER SElECTED Ff)l. THIS BASIH IS
Bl1.LtVD QlO1: lOO-'fR: FE~ FIS: 8/25/97 (BHI00FIJ.CHfJaddH&AGC/pondJ

BASlMIO 48

.. BASIN CGtlENT: SUB8A51M 10- 48

AAfA Cf BASIN LE~TH OF BASIN DrST TO CENTROID IHPERVICllS ~ SLOPE LffIT ~TlCN
(S(Jfll (H!) (/m (PeT) (FT/FT) (HIN)

.13 50

19

40.00

.OIlO

5.00

COEfFICIENT
(REFLECTING TIME TO pt.lI:J

COfHICIENT
(RELATtO TO PW-RATE IF RlIO"F>

093 .383

CAlCllATEO L.NIT HYORa>RAPIi

rrf'€ TO ?EN:: TIME OF CC>>lCENTRATlCN PEAl RATE IF RI.N)FF LNIT HYDRCGRAP!i PEAK WlLME rK RlJ(lfF
(,'1IN) (HIN) (CFS/S()t!l (CFS) (~l

179

Z5.JO

6.72

201536

253.94

-- '(lTE THE TfHf TO P[AA 15 CAlQlATED BASED (W THE: Tflt: IF CCWCEH1'AATICN PRQvfOEO BY TIE USER.
REPlXING THE CJriE C(HlU1'EO BY ClJfl{l np- 7,83)

wIDTH 4T 50.. 15. MIN. "'10TH AT 75" B. HIN. GO".35 1(]5 - .45

38