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

AT TIME

August 25,1997 BH100FI3.CHO

A '" 48.6 ACRES
Q. 176. CfS
U.O.F.C.O. C1W Rl.)l(fF .&MAlYSIS EXECUTEO ()t OATE

CttfPEiPC VERSI()t f'({)IFlED IN JANUARY 1985

PRINT (JITICtII NIJIlER SELECTED F~ nus BASIN [S 7

lltllHENl GllCH; 100. VA:: FEHA F1S: 8/25/97 (BHI00F[3.CHlldddH&AGC/pond3

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I

I

BASIN 10: 23

8ASIN C(HOT: Sle8ASIN I~ 23

I

,22

AREA Cf BASIN LEI<<iTH Cf BASIN DIST TO CENTROID IIftRVHl.JS AREA Sl(l)E LNIT OlIlATIOt
(SCJ111 nUl (HIl (PCTl (FT/n) (HIN)

1.15

.63

5.00

J2.5O

.0140

COEFFICIENT
(RfJLECTII<<> TtME TO PEM)

COEFFICIENT
<RELATED TO PEN( RATE Cf RlKlFF)

I

.097 .338
CALCllATEDlltITH'tIJOiP.APH
TIME TO PEN; PEN:. RATE Cf RUUf IltIT HYMOCiW' PEM. VClLK Cf RlJ(FF
(HIN) (CFS/S()I1l <CfSl (M)

I

16.46 929.97

WIDnt AT 50- 32. HIN.

202.73

ll.63

WlOnt AT 75 - 17. HIN. K50. .31 1::75-.42

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RAINFALL LOSSES ItflUT WI IlASIN DATA

MAX. PERVIWS RET. . .40 IN. MI.X. IHPERVIll.IS RfT. . .10 IN.
INFllTRATICtI . 4.50 IN.fIfl.. DECAY. .OOlSO/SECl)() FNINFl '" .60 IN.fIfl..

I

m( !.m
HY_
o. 0,
5, 69.
10. 160.
15. 201.
20, 194.
25, 161.
30. 137.
35. Ill.
40 98.
BASINlD: 23

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I

I

-STCflJ1NO.-

TIHE LNIT
HY_

TIME LNIT
HY_

45. 84.
50. IJ.
ss. 62.
60. Sol.
65. 46.
10. 40.
75. 34.
80. 29.
85. 25.
BASIN aH1ENT:

90.
95,
100.
IllS.
no.
ll5.
120.
125.
130.
Sl.6BASINI~23

22.
I'.
16.
14.
12.
10.
,.
B.
o.

.
.
.

.

DATE ~ RHLIlH PERlOO . 100Y[AR

INCREMENT TOTAl IT"'" IMCREHENT TOTAl IT"'"
TIM{ RAINFAlL EXCESS HYDROOW'H TIM{ RAINFAlL EXCESS HY1lROOW'I1
I 011N.) (iN) PRECIP (CfS) (HIN.) !IN) PRECl? (CFS)
.
o. .00 .000 o. 100. ,OJ .010 93.
5. .OJ .000 o. 105. .OJ .010 82.
I 10 .OB .002 0 llO. .OJ aI, 7J
15 11 ,0311 J. 115. ,OJ 010 55.
20 2Z .061 11 120. OJ 01' 59.
15. 311 .128 18. 125. 00 '00 52.
30. .68 61' 84. 13(1. .00 .000 46.
35 311 .332 161. 135. 00 .000 39.
I 40. 2Z .115 13' 140. ,00 .000 34.
45. .17 119 1\8. 145. .00 .000 18.
50 14 '98 156. 150. .00 .000 24. .
55. .11 072 243. 155, .00 .000 16.
60. .11 .072 228. 160 .00 .000 12
65, 11 .072 212. 155. .00 ,00' ,.
I 70. .05 .019 195. 170 .00 .aoo 7.
75. 05 .019 116. 175 00 .aoo 5.
80 .OJ .01a 156. 180. .00 .000 4.
85 OJ .010 137. 185. .00 .000 J
90 OJ .010 12' 190. .00 .000 1
I 95. OJ .010 IllS. 195 00 .000 1
TOTAlPRECIP, '" 3,12 q.1-OR RAIN '" 2.70) EXECESSPREClP. '"1.932 INCHES
"JQLI1E ~ EXCESS PRECIP '" 12. ACRE. FEET
I PEAK Q '" 258. CFS TIME ~ PEAK '" 4S.I1IN
INFILT.'"4.501NIt,1l. DECAv'".OO180 FN(NF. .60INII'1l.
MAX.PERV.RET,- .40 IN. M'C.I~,RET.. laiN.
I U.O.F,C.O. ClH'Rl..N:fF ~'fSIS EXECUTED ~ DATE ATTIHE
CLIflE/PC VERSIll4 I1llIFIEO IN JNlJARy 1985
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15