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 BHIOOF13.CHO

1193 .421

CALC\l.AT(O LltIT HVOROOW'H

TIM[ TO PEAl PEAl(. RATE (J' RIJO'F lJUT HYORO:iRAP Pf)J( VO-LK (J" RlJr()FF
(tUN) (CFS/S~[) (CfSI (AF)

14.<}4

1316.58

343.63

13.92

WIOTtl AT SO.. 23. H(N. WIDTH AT 75" 12. HIN. K5G".35 K7S" .45

RAiNfALL lOSSES INPUT WI BASIN OATA

flAX. PERVIClIS REr. .. .40 IN. P'oU. IIftRVlllJS RH. .10 IN.
INFllTRATI()I .. 4.50 IN,/Ift DECAY" .OOl80/SECOO FNIHFl" .60IN./Ifl,.

m. 'JUT m. 1JUT TIll LOIT
""""""'" HYDl!CGW'H H'f1JOOOW'H
o. o. 35. 135. 10. 17.
,. 106. 40 107. lS. 11.
10, Zll. 45, 85, 80, 17.
IS. 344. 60. 68. Il!;. 13,
20. 289. $. ,"" 90. 11.
IS, 221. 60. 43. ", 8. .
30. 170. . 65. 34. 100, 0,
IIASIN 10: " .. BAStN CCtKHT: SUl8ASIN ID- 45

-ST(JlHICl.-

DArt CR RfTlRN PERlOO .. lOOYEN!.

IN[."'" TOTAL STJJ!M INCROt:NT TOTAl STJJ!M .
TIll RAJllfAlL (XCESS HYDl!CGW'H TIll RAINFAll ExCESS HYDl!CGW'H .
<l1lN.) (IN) PREClP (CfSl (HIN.) (IN) PRECIP (CFSl
.
.
o. .00 .000 o. 90. .., .012 121. .
" .., .000 o. ". .., .012 101.
10. .00 .003 o. 100. ,OJ .012 85, .
IS, .12 047 6. '06. ., .012 73. .
20, .22 .082 13. 110. .OJ .012 63. .
IS. .38 .163 ". US. ,., .012 $. .
30. .68 .621 160. 120. .OJ .012 47. .
35. ,38 .335 291. 125. .00 ,000 37. .
40, .22 .178 394. 130, ,00 .000 29. .
45. .17 .132 411. 135. .00 .000 12.
60. .14 .101 384. 140. .00 .000 16.
5!;. .11 .a75 346. 145. .00 000 12. .
60 .11 .(175 308. 160. 00 .000 9.
", .11 .076 276. 1". .00 .000 7.
70 .06 .023 '" 160. .00 .000 ;
75, .06 .023 211. '''. .00 .000 4. .
SO. .., .012 176. 170. .00 .000 3, .
85 .03 .012 146. 175. .00 .000 2. .
TOTAlPRfCIP . 3.12 (1-tO..RRAIN- 2.70) EXECESSP'RECIP. -2.036 INCHES
vo.lHE~EXCESSPRfCIP- 28. ACRE.FEET
""" a. 411. CfS TIff: ~ PEAK" 45. MIN.
INFILT.-4.50 I"'/~ DECAY" .00180 FNINF- .60 IN/~
HA.X.luv.RET.- .40 IN. i'W.ltfl.RET.-.lIJIN.
!J.D.F.G-D. QHI RlNOFF AtW..VS!S EXECUTED ~ DATE ATTIHE
awE/PC "IERSI~ ~IFIED IN J.A1lIAA.Y 1985
PRUIT OPTIC* "lJ'6[R SELECTED Fat THIS BASIN IS 7
BLlLHEAll W.CM: 100-l'R: FEHA FIS: 8/25/97 (BHIOOFI3.CHIladaH&AGC/pondJ
BASINlD: 46 .. BASIN COKHT: SlIl8ASINID-46
AREA OF BASIN LENGTH OF BASIN OIST TO CENTROID IHPERVI(lJS AREA SLOPE Lt4IT OLRATHJt
(S()tll (1'11) (MI) IPCTl (FTlFTl (HIN)

.04

.26

13

40.00

.0040

5.00

COEFfICIENT CCIFFlCIENT
(REflECTING TIME TO PEAA) (RELATED TO ?f:AK RATE OF RtJ()fF)

093 323

CAlCl1.ATEO lMll HYORCXiRAPH

Tl~ TO PEAK TlHE OF CCJ<<:ENTRATI()rt PEAK RATE OF Rl..NJFF L.NIT IffDRCXiRAp!i PEAK vo.LtE IE Rl.NFF
(MIN) (M1N) (CfS/SCIUl (CFS) (Ar)

7.53

18.00

2467.17

2.19

101.15

36