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
/0, 12 ,.. 1. 80. .OJ 001 45, .
Z5. 38 023 6. 85. OJ .001 33, .
30, .68 ... 132. '" OJ 001 26,
35. 38 '" 207. 95. OJ 001 16. .
40. 12 L61 206. 100 OJ .001 9 .
45 17 .lIS 184. IDS. " .001 6,
SO. .14 084 160. !l0. OJ .001 .. .
SS 11 .osa L36 US. OJ 001 3. .
TOTAlPREC1P. 3.12 (l.t{lA RAIN - 2.70) EXECESSPRECIP, .. 1.508 INO€S
vtll.tf:CfEXcrSSPRECIP. 11, ACRfAEET
PEAK Q - 207.CFS TII4E Cf PEN: .. J5.J1JH.
INFllT.- 4.50 IN/If!. DECAY" .00180 fNlNf' . .60 IN/~
1W.P€RV.RET....40 IN. HAX.I~.RET." .10 IN.
RATICIW.. F(RU.A C . ,AS
,- 4.5 [NO(S/tQR
.- 8J.8ACRES
Q- 182.CFS
U.O.F.C.O. Cltfl RlKfF AHALYSIS EXECUTED ~ DATE AT mE

a..Ift/PC VERS!()j I'IDIFlED IN JNl./ARY 1985
PRINT CfTI()t tf..ttiER SELECTED F(R THIS BASIN IS
BlI.Ltt"AD GllCH: lOO.YR; FEM FIS; 8/25/97 (BtilOOfIJ.OtIladclt&AGC/p0n03

BASIN 10: 39

-. lIASlH CCItIEHT: SlIlBASIN 10- 39

ARIA ~ BASIN lflrCiTH Cf BASllf 0lS1 TO CENTROID IIftRYICllS NV. SUJ'E IJUT (lRATIOriI
(S()4Il om (1m (PeT) (FT/FT) (HIN)

.18 .72
COCFFlCIEHT
(R[FlECTIt<<i TIME TO PEAK>

,16

2,00

.0150

5.00

CClFFICIEHT
OlRATEO TO PEAK RATE Cf RlJ(Ff)

.156 .258

CAlCllATED '.IUT IfYtKGCWH

WE TO PEN:. PEAK RATE Cf Rl.HJFF IJUT HYm:GW' P9K VCl.lJE CF Rl.HJFF
(HIN) <CFS/S()tl) reFS) U";>

11.56

1092.60

195.58

9,55

WIDTH AT 50. 27. MIN. WIDTH AT 75.. 14. MIN. GO" .25 K75".34

RAINFJLL LOSSES INPUT WI BASIN ClAT....

MAX. PERV{CllS RET. . .40 IN. IW". JI'ftRVIClJS RET. 10 IN.
INFILTAATI~ . 4.50 IN.I~. DECAY. .OO180/SEC()() FNINFL.. .60 rN./If!..

THO: !lilT TIHE !lilT TIHE !lilT
H\'!JROOlAPH HYllRCGW'H HYllRCGW'H
o. 0, 40. IS 80 19.
S, 108. 45, 63, 85. 16.
10 191. 50, 63. '" 14.
15. 182. 55. 45. 95, 11.
10. 149. 60. 38 100. 10.
25. 129. 65. 32. 105. 8.
30. 107. 70. 17 lHI. 0
36. 89. IS. 13. o. o.
BASINID: J9 BASIN C()KNT: SLB8ASIN lD- 39
.- STOOH NO_ . ! - DATE CR RETtIlH Pf:RlOO .. lOOYEAA
rNCREHEHT TOTAl 5T"'" INCREtf:NT rOTAl ST"'"
TIHE RAINFAlL EXCESS HYllRCGW'H TIHE RAINFAlL EXCESS HY1JlOOW>H
(MIN.) (IN) PRECIP (CFSl (HIN.) UN) PRfCIP (CFS)
o. 00 .000 0 80 .OJ 001 %. .
S OJ .000 o. 85 OJ .001 81.
10 .08 .000 o. 90. OJ .001 68.
15. !2 .002 o. 95 ,OJ .001 sa. .
10 21 004 L. 100 OJ .001 49.
25 38 013 4 105. .OJ .a01 41.
3D. .68 '09 71. llO. .OJ .001 35.
35. 38 319 166. 115. ,OJ .001 30.
40 .21 161 193. 120. .OJ 001 25.
46. 17 !IS 196. 125. .00 000 21.
so. .14 084 189. 130, .00 .000 18.
55 11 058 176. 136. .00 000 11. .
60. .!I osa 16l. 140, .00 .000 7.
30