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

22

80

J2

33.10

.0130

5,00

COEFFICIENT CCl:FFICIENT
(REFLECTING rut: TO P(AAl <RELATED TO PEN: RATE OF RlJ(FF)
097 .344

OL01.AT[O tJnT HYORCKiRAP!i

Tit( TO PEN: PEM RATE Cf Rl.t(FF LtlIT 1f1'0R0:".AAP PEM nLttE Cf R\JIOFF
(HIN) {CfS/Sl)l1l (CrSl (AF)

11.09

1540,21

341.94

11.84

WIDTH AT 50" 19. HIN. WIDTH AT 75" 10. HIN. GO".34 1:.75" .46

RAINFAll lOSSES INPUT WI BASIN OATA

MAX. P(RVIOJS RET, .. .40 IN. I'W. IHPERVHlJS RH. .10 IN.
INFllTRATI()rf.. 4.50 IN./t<<. DECAY" .00180/S[(OO fNINFl" .60IN,/tR.

TIM( !JIlT TIM( !JIlT TIM( !JIlT
HYOOOiRAPH HYOOOiRAPH HYOOOiRAPH
o. o. 30. 125. 60, 16,
5, 199, 35, 96. 65. 20,
10. 338. 40. 74, 70, 16. .
IS. 195. <S. 57. 75. 11.
20. 216. SO. 44. 80, 9. .
15, 161, 55. 34, 85. o.
BASIN 10: 15 .. BASIN CCMHT: Sl.lI8ASINID-25
-- STOOHNO." - DATE ~ RETI..RN PERICO .. lOOY(AA

INCREHENT TOT,q ST'" 1""""" TOTAl. 5_
TIM( RAINFAll EXCESS HYOOOiRAPH TIM( RAUf'.lLl EXCESS HY_ .
(HIN.) ([N) PRECIP (CFS) (HIN.) (IN) PRfCIP (crS) .
.
o. ,00 .000 o. 85. ,OJ .010 97, .
S. .OJ .000 o. 90, ,OJ .010 79. .
10. .08 .003 L 95. ,OJ .010 64,
IS. .11 .039 9. 100. .OJ .010 53. .
10. .22 .068 17. 105. OJ .010 44.
15 JlI 130 61. lto. .OJ .010 34.
30 .68 .619 196. 115. .OJ .010 18.
35. JlI JJl JJ5. 120. .OJ .010 14.
40. .22 175 374. 125. .00 .000 20.
45. .17 119 350. 130. .00 .000 IS.
SO. .14 .098 Jl1. 135. .00 ,000 11.
55. 11 071 274. 140. .00 .000 8.
60. .11 .on 240. 145. 00 . aDo S.
65, 11 .1)73 213. ISO. 00 .000 4,
70. OS .020 183. 155. 00 .000 3.
75. OS .a20 150. 160. .00 .oao ,.
80 .03 .IJlO 111 165. .00 .000 "
TQTAlPRECIP, .. 3.12 (HO.R RAIN- 2,70) EXEC(SSPRECIP "1.940 INCHES
VCll.l1E Of EXCESS PRfCIP.. 13. ACRE-FEET
PEAKQ- 374.,:FS HME Qf PEN( .. 40. ~IN.
INFILT.- 4.50 :Ndfl ::JECM- ,00180 FNINF.. .601N/HR
i1AX,PERV.RET.-,40[N. ~.rlt>~ET,- .10 [N
UD,F.C.D.Clt!PRlJt()FF~'fSIS EXECUTED ()rl DATE ATHMt:

OJiPElPC VERSI()l HOOlflEO IN JANJAAY 1985

PRINT OPT[()I NlHlER SELECTED FeR THIS BASIN IS 7

BLllHEAD GlLCH: LOO-YR; FEI1A FrS: 8/25/97 (BHIOOfI3.CHIladd-l&AGC/pondJ

BASINIO: 26

BASINCl)tENT: SL.e8ASINID-26

AAEA Qf BASIN LEHGTlt Qf BASIN DIST TO CENTROID IHPERVICUS AREA SLOPE l.Jm Dl.RATH>>I
($()1[) (~]) (HI) (PCT) (FTiFT) (HIN)

i2 6J

31

2928

.0230

5.00

COEF~ICIENT
(REFLECT1~ TIME ~o PEAK)

COEFFICIENT
(RELATED TO PEAK RATE OF RUNOFF)

.100 28J

CH.OLmO lJtlT HY~

TIME ro PEAl: TIME Qf CCJaHTAATICIt "€AK RATE Qf RlKlFF I.lm H'YOROOWH PEAK vtLLIE OF Rl.I<<FF

17