FLOOD01889

• County: Summit
• Community: Tiger Run Resort
• Stream Name: Swan River
• Title: Tiger Run Resort Community File
• Date: 1/1/2001
• Prepared For: CWCB
• Prepared By: CWCB
• Floodplain - Doc Type: Community File

1) Set Channel width @ 30' ./

2) Set Channel slope @ 1.89%

.

3) Set Design discharge @ 1,250 cfs > > '740 cfs:

4) Set "N" @ .035,conservative for rivers in poor condition

5) Set side slopes @ 2:1 H/V
6) Set min. l' freeboard above W. S. @ max. discharge
Calculate depth of flow required
. . r> 1.4~ .r>L>~" A Y,z
Fran Manning equation: '-'< = -;;:;- .r7~ "/

./ /, _ ~ -r', ....rz
I, 250 c</./'r-/ f'<:'c. -.0 i'~"q,R I. 8-",.

Express AA2/~ in terms of unknown depth Y nom
/.1f~ ( 1\ (i'Of/~ .. C"y;</~ % ( 11
I,Z~Ocv.;Y/f't!'c.= .Oi'7 :;0 f C'SWj ~ fC' 'N ff) , .OI8~~<7)4) e
_ ~o. '/ode. 'AI 0/,) (Yo )
- 4e.'17 (" -I'" 2, .I'?7G20.~ ,
OPEN CHANNEL DESIGN /0 cY/J /1

e/~ 9~7: (90 AI of 2!f.'} o/~
. 00. I' 4. 472y'<'/ ~

Solve by trial/error for YN
_ ' _ (,,;or/8)h _ (l0.8)~~
1) Try3.0 2/~.9~7-(90f/~.4IG)~~- (4~.4/~)l!/~ =

, 21-'. '7(#? t- /~B"Z8 ("<'/0/ Close cnovgJJ)
2) Try 3.5-21' ~4-5={/01'T2~.~)~, = ('1~.5)% '" :;,,?'17.28
. ('?o t/(;'.~?2)~' (~(#.(;'?2)~' /2. ':)(;,
en.%? F t?7?8~ (Too ~,jA)
Converge @ l~i~~~ = .262 (.5) = .1309 ~ 3.15'

(C1)~.S'o" /0).87) V, .?, (;,C1)~."?6' )
3) Try 3 IS' - "''/'''' ....n:" - = ""/~.,8G (V",rv r/ose
'. "'7.""'''''-(~o.fI4.0.0))''i'''= /2.48' ",.,." ~'J"'"

213.37 = 215,86 ,.~. Depth of flow = 3.15'

l',44~.(;,?
12.~?

2