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
40 21 ". \45. 125. ... .000 Z9. .
45. " .1:13 509. 130. .00 .000 11, .
60. l' .102 447. 135 .00 '00 16.
55. .11 076 385. 140. .00 ..00 11.
60. 11 .076 329. 145. .00 .00' 8.
65 11 .76 287. ISO 00 .00' 5.
10 OS .023 246. !5> .00 00. .
IS OS .023 ". 160. .00 000 J
80 .OJ .012 157. 165 .00 .00' "

TOTAl. PRECIP. ... J,11 (l-1il.R RAIN" 2.70) [XE(ESS PRECIP. ... 2.045 IHOE:S
VQl.ttE IF EXCESS PRECIP ... 31. ACRE-FEET
PEN: a... 545. as TIME CE PEAK'" 40. HIN.
INfllT.- 4.34 IHltfI: DECAY - ,00180 FNIHF'" ,59 IN/~
HAX.PERV.RET.- .40 IN. HAX.II'f'.RET." .10 IN.
U.D.F,C.O. C1Jfl A1.J(fF NW.Y5IS EX[CU1ID ~ OATE AT TIME

Cltft/PC VERSICW I(DIFIEO IN IN<<JARY 1985

PttIHT (JlTICW JrU6ER SELECTED FCR THIS BASIH IS

BlLllVD GIl.CH; lOO.YR; FEHA FtS; 8/25/97 (BHIOOfIJ.CHIladlfl5.NiC/pondJ

MSIIlIIO: S3

.. BASIH CCJttENT: SL8BASIH 10- 53

NiE.A CF 8A$IN lENIillt CE BASIH CIST TO CENTROID I/ftRYIWS AA!A SllJlE lItIT llRATlCN
(SCltJ) (HI) (Mf) (PCT) (Fl/FT) (HIN)

.09

,63

,17

40.00

.0170

5.00

CCIJFICIEHT OXFFICIEHT
UIEFlECTHCi WI: TO PENO (RELATED TO PEAK RATE Cf RlJ(J'f)

.093 .366
CJLCtlATED ~IT ~

TIME TO PEAK TIME (F CCWCENTRAT!fJ4 PEAK RATE ('$ RlJ<<J'F llIIT IfYOIlOOWlH PEAK VCLlII: CF RlJr(f"F
(HIH) (HIN) <CFS/$(J1Il <CFS) (N)

10.76

28.00

1702.69

160.05

5.01

.... NOTE: M mE TO PEAA IS CALOl.ATED BASED ~ M mE Of CCNCEKTRATIlJrt PROVIDED BY Ttt: USER.
REPlACING M (Jl[ lXIfIUTEO BY Cltf'O (TP- 8.85)

WIDTH AT 50" 18. HIN. WIDTIi AT 75" 9. HIN. K5ll".35 K,75.. .45

RAINfAlL LOSSES INPUT W/ BASIN DATA

MAX.?ERVIOOSRET....40IN. MAX.IHPf:RVICl.lSRfT. .1011'1
INFILTRATlCW .. 4.50 IN./lft. DECAY" .00180/SECOO ~NINFL".6O IN.ltfl..

m. LOIT m. LOIT m. LOIT
HT_ HY_ HYD1rolAPH
o. o. 25. 69. 60, 17,
5. 89. JO. 51. 55. IJ.
10. 159. JS 40. 60. 10.
15, 130. 40 JO. &S. 8.
10 94. 45, 2J 70. 0,
BASIN to: 53 .. BASIN WtlENT SIJ!8ASIN II>- 53
-STOOMNO. .. DATE 00 RETlAA ?ERlOO .. 100YEAA
INCREMENT TOTAl 5T"'" IHCREHENl TOTAl 5T"'"
TIM( RAINFALL EXCESS HY1l1!OGRAPH TIM( RAiNfAlL EXCESS HY1l1!OGRAPH .
(MIN.) (IN) PRECIP (eFS) (HIN.) <IN) PRECIP (CFS)
0 .00 .000 O. IS. .05 .023 65.
5. OJ .000 o. 80. OJ .012 51. .
10. 08 .003 O. 85. .OJ 011 41.
15 11 047 5 " OJ .012 JJ. .
10. 21 081 15. 95. OJ .012 1J. .
15. J8 ISJ J3 100 OJ 011 18. .
JO 68 .621 95. IOS. OJ .012 15. .
JS. J8 JJS 160 110. .03 .012 IJ. .
4' 11 178 1/J !IS 03 .012 !I, .
45 17 .132 159. 120. OJ .012 10.
50. 14 .101 [40. 125. 00 .00' .,
55. .11 075 111 130. 00 .000 6,
60. .!I 075 108. 1JS. .00 .000 4,
65. !I 076 94. 140. 00 .00' J, .
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