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 BH I OOFI3.CHO

PRINT (JlTI~ "lHlER SElECTED Fill (HIS BASIN IS 7
BLLll'€AO QJ.CH: loo-VR: FE~ FlS: 8/25/97 UIMlOOFl3.0iIla<Xll&AGClpondJ

BASIN 10: 55

BASIN C[)tlENT: SlJ!8ASIN 10- 55

AREA lY BASIN LEI<<iTH C'F BASIN OIST TO CENTROID 1l1PERYlCllS MEA SLOPE ~IT lmATI(lI
{5()111 om (I'll) (peT> (Fl/FT) (HIN)

.08 57

.16

40.00

.0130

5.1l0

CCEFFtCIEJrfT
(REFLECTING TJI'I: TO PEAK)

COEFFICIENT
(RELATED TO PE.&I. RATE (f' RlHOFfJ
,355

.093

CAlcu...ATEO lJIIT HYl>>IOiRAPH

TIHE TO PHK TIME (f' ClllCEHTRATICW PEAK RATE (F RLNCfF (Jm HYORCGWH PEAK VCllJ€ fS RlIIFF
(1'4114) (MIN) (CFS/S<JU) (CFS) (N)

10.43

27.00

1716.JD

130,44

4."

.... r<<JTE : TI-( TIHE TO PEAK IS c.tt.Ctl.ATED BASED ()t Tl( TIf'll (F C(JrfCENTRATlCIl PROVIDED BY TlI: USER,
REfUCING Tl( IH COf'UIED BY C1H'll (YP- 7.52)

WIOTH AT SO" 17. HIN. WIOTH AT 75" 9. HIN. K50".35 US".45

RAIHF1LL lOSSES INPUT WI BASIN DATA

.IW. PERYlllJS REf. .. .40 IN. K'.X. [HPERVIQJS REf. .10 IN.
IHfllTRATI<>>t .. 4.50 IN,llft DECAY" .OOl80/SECCHl FNIHFL".60 IIUlft

TIlt: LOIT TIlt: LOIT TIlt: LOIT
"""""""" HvtlR"'''''H """"""""
0, o. 25. 55, so. 14,
S, 78. Jl). 41, 55. 11.
10. 130. 35, 32. 60, B.
15, 103. 40. 24, 55. o.
20. 74. 45, 19. o. o.
BASINlD: 55 .. BASIN ClJKNT: SIJl8ASIN 10-55
......... STCRlI(). .. DATE Cfl. RHl..RN PERlOO - 100YEAA
INCREMENT TOTAL 1Tl"" IHCRO€HT TOTAL 5T"'" .
Tilt: RAINFALL EXCESS HYI''''.'''' Tilt: RAINFAll EXCESS """"""""
CHIN.) (IN) PREcr? (CFS) (HIN.) (IN) PRECI? (CFS)
.
o. 00 .000 ,. 75. .05 .023 53,
S. .OJ .000 o. 80. ,OJ .012 42. .
10, .08 .003 o. 85. .OJ .012 33,
IS. .12 047 4. 98, .03 .012 13. .
10. 22 .082 13. 95. .03 .012 17.
25. J8 .153 18. 100. .03 D12 14.
30. 68 .621 81 !... 03 .012 11.
35. J8 33S 132. llO. .03 012 10.
40 22 178 139 ll5. .03 012 9.
4S. 17 .132 1.28. 120. .03 '12 B.
so. .14 .101 113. 125 00 .000 7.
55. 11 .075 98. 130. .00 000 S.
60, 11 .075 " 135. .00 .000 3.
55. .11 076 76. 140. .00 .000 3.
70. .OS 023 55. 145. .00 .000 2.
TOTAlPRECIP, . 3.12 (l-fO.A.RAIN- 2.70) EXECESSPRECIP. .2.036 lHOES
Vll.LK: ~ EXCESS PRECI? 8, ACRf-FEET
PEN:. Q. 139. CFS TIME rE ?t:AK . 40.HIN.
INfllT..4.50!N/lfl OECAY-.OO180 FHtNF- .60IN/Ifl
KU.PERVRfT-.40IN. MAX,IMP.RET.. .10 IN.

RATICfiAl FCJlJ1..lA C . 65
I . 4 5 INCHESJI-OJI:
~ . 48.6 ACRES
'J- 143, CFS
U.D,F,C,D. CLW Rl..taF AlW,.YSIS EXECUTED CW DATE

.%TTIfoIE

OWE/PC 'iERSICW Jo01IFIEO iN JANJAAV 1985
PIl:INT CFTICJt1tJ'8ER SElECTED F~ nus BASIN IS

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