Design of Roller Bucket

DESIGN OF ROLLER BUCKET USBR Example

Maximum flood level Tail &a%e' Level S)ill*a+ C'e% Level D-S 'ive' .ed eleva%io/ 0ead a.ove 'e%, 0 3=C'e% level4Tail*a%e' level Di3a'6e ,7 &id%3 of Ove'flo* e%io/,B Di3a'6e )e' U/i% *id%3, 8 = 7-B value of 6 T3eo'a%ial 9eloi%+, 9%= :;6;0<3  %ual 9eloi%+ 9eloi%+,, 9 1=("!1;9%

= = = = = = = = = = = =

1"25 f%-

De)%3 of flo*, D1

=

5"!$ f%

F'oude Num.e',F=9 1-:;6D1

=

!"#!

R-;D1<91-6 Radiu of Bu>e%, R Radiu of Bu>e% ;Sele%ed R-;D1<91-6

= = =

("1 ?"5? f% 2("(( f%

=

("12

R-;D1<91-6 v F, Tmi/-D1 Tmi/ R-;D1<91-6 v F, Tmax-D 1 Tmax R-;D1<91-6 v F, T-D1 T Tail &a%e' de)%3, T

= =

15"@( @2"((

= =

2"(( 115"((

= = =

1"#( #2"(( 111"(( f%

Rolle' Bu>e% I/ve'% Level R-A  -T Max 0ei63% of Boil,  T3e de)%3 of *a%e' i/ %3e Bu>e%, B Diffe'e/e .-* Tail *a%e' ;4B

1,!1"#$ 1,(11"(( 1,#("(( !(("(( 21"#$ 5!"(( 1,(((,((( 1,#$("(( #(#"(# 2"( 125"55

f% f% f% f% f% f% ue f% ue-f% f%- f%-

?!@"(( f% = = = = = =

((""(?2 1"2 155"(( f% 1(("(( f% 55"(( f%

Fi6u'e #5 USBR S%illi/6 Bai/ .+ a%e'>a

Fi6u'e ## USBR S%illi/6 Bai/ .+ a%e'>a Fi6u'e #@ USBR S%illi/6 Bai/ .+ a%e'>a Fi6u'e #! USBR S%illi/6 Bai/ .+ a%e'>a T3e .u>e% i/ve'% 3ould .e e% /o lo*e' %3a/ 2 fee% .elo* 'ive'.ed eleva%io/ o' mo'e %3a/ 2? fee% a.ove" 2? f% /o% feai.le Fi6u'e @( USBR S%illi/6 Bai/ .+ a%e'>a

DESIGN OF ROLLER BUCKET Jhing Hydropower Project

Maximum flood level Tail &a%e' Level &ei'-S)ill*a+ C'e% Level 0ead a.ove 'e%, 0 3=C'e% level4Tail*a%e' level Di3a'6e ,7 &id%3 of Ove'flo* e%io/,B Di3a'6e )e' U/i% *id%3, 8 = 7-B Bu>e% I/ve'% Level value of 6 T3eo'a%ial 9eloi%+, 9%= :;6;0<3  %ual 9eloi%+, 9 1=("!1;9%

= = = = = = = = = = =

122$"@@ m 122("(( m 1225"(( m 1"@@ m 5"(( m 1?"(( ume 5("(( m 5"$$ ume-m 12@"1! m !"?1 m- 1("#5 m-

=

!"#? m-

De)%3 of flo*, D1

=

("5@ m

1"$5 f%

F'oude Num.e',F=9 1-:;6D1

=

5"$1

5"$1

R-;D1<91-6 Radiu of Bu>e%, R R-;D1<91-6 v F, Tmi/-D1 Tmi/ R-;D1<91-6 v F, Tmax-D1 Tmax R-;D1<91-6 v F, T-D1 T

= =

("$5@!@ m

52?"## f% 52#2"@2 f% 52@#"?$ f% $"?1 f% 12"1 f% #5?"5 ue 121"5 f% 5?"!? ue-f% 52$5"$1 f% 2"( f%- 25"! f%- 21"@@ f%-

("1 1"@1?$! f%

= =

(

= =

(

= =

(

Fi6u'e #5 USBR S%illi/6 Bai/ .+ a%e'>a Fi6u'e ## USBR S%illi/6 Bai/ .+ a%e'>a Fi6u'e #@ USBR S%illi/6 Bai/ .+ a%e'>a Fi6u'e #! USBR S%illi/6 Bai/ .+ a%e'>a

Hydraulic model tests be performed whenever: (a) sustained operaon near the liming condions is expected (b) discharges per foot of width exceed 500 to 600 cfs  (c) velocies entering the buc!et are over "5 feet per second (d) eddies appear to be possible at the ends of the spillway (e) waves in the downstream channel would be a problem