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

o. .00 ,000 0, 80. .OJ .012 79, .
5. .03 .000 0, 85, .03 .012 61.
10, .08 .OOJ 0, 90, ,OJ .011 48. .
15. ,II ,047 7. 95. .03 .012 3<, .
20. .12 ,082 ZJ. 100. ,OJ .012 21. .
25, ,38 .174 54, lOS, 03 .012 2/. .
30, ,68 .626 149. UO. .03 .012 19, .
35. ,38 .338 2S7. 115. .03 .012 17,
40. .2/ .181 281. 120. .03 .012 16.
45, 17 .135 257. . 125. .00 ,000 13, .
50. .14 ,104 225, 130. .00 .000 9,
55. .11 .078 193. 135, .00 .000 7. .
60, .11 .078 166. 140. .00 .000 5, .
65. 11 .1178 146. 145. .00 .000 J.
70, .05 .015 124. 150. .00 .000 2, .
75. OS .025 100. 155. .00 .000 2,
T01ALPRECIP.- 3.12 (l-IO.R RAIN .. 2.70) [XECESSPftECIP. -2.086 INO"5
VCJ,.I.I1ECf EXCESS PRECIP.. 16. ACRf.FE[T
PEN:: Q.. ISI.CFS rnEfFPEJ.I(.. 4O.HIN.
IHfILT.- 3.70 IN/~ ~CA'f .. .00180 FHINF- .55IN/lfI.
.w:.PERV.RET.- .40 IN. PW.IPI'.RfT.- .10 IN.
U.D.F.C.D. CIJfI Rl.fraF NW.YSIS [xrQJTEO ~ OATE AT Til'E

a.Jfl[/P(: 'lERSIC>>t f'(()IFIED IN JNlJAAV 1985
?flINT OPTI()t Pl.ItiER SELECTED F~ THIS BASIN IS
Bllllt:AD GllCH; lOO.YR: F[HA FrS: 8/25/97 {BHIOOFI3.DtlladdHoUGC/pond3

BASIN !D' 60

h BASIN Cl)t4ENT: SlEBASIN lD- 60

AREA ~ BASIN LEt<<iTIi ~ BASIN OIST TO CENTROID IIftRYH1.lS NlEA SllPE ~IT (X.P.ATIClI
(Sl)tf) (1m (Mil (PeT) (FT/FT) (HIN)

.16 .73

.36

21.00

aZlO

5.00

CC(FFlCIENT
(REflECTING TIP'( TO?[AA.J

C((fFIC!ENT
(RELATED TO PEAK FlArE Cf Rl.J()fF)

.109

.249

CALCtlATED l.'HT HYOOCGRAPH
T[H[ TO P[AK PEAK RATE Of RlJ()fF LHIT HYOOCXiAAP PU\j( '~a.lK:;f RttlCfF
(HI~) (CFS/SO'tll (CFS) (AFl

10,70 1164.02

190.90

8.75

',,10TH AT 50.. 26, HtH.

Ioo'IDTHAT75" 13 MIN. KSO.. 25 1;75".34

RAINFALL LOSS[S INPUT wi BASIH OATA

~x. P[RVlOOS RET. .. .40 IH. f1AX. IMPERVIOOS RET 10 IN.
!NF"llTRAT!()r1..4,SOIN.iIfl:. DfCAY- .OOlaO/S[CI)(l FNINFl.- .6DIN.fl-fl..

TIME l.H1T TlI1E "'IT f111E (.tHY
HYDRQJRAPH HYOI!OOW'I< HYO<<OO!APH
o. 0 40 " ao 16
5. 116, 45. 56. is. 13
10. 1.. 50. 46. .. 11
15. 169. 55 J9. 95. 9
20. 141. 60. J2 100 ,
50