Download - 1m Drop Design
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Design of Vertical Drop of 1 m at Ch: 21960 m of DY-10 under DC-1
DATA :
t of Drop ! 1.00 m
Description U/S D/S
Discharge in the Distributary 0.125 m3/sec 0.125 m3/sec
Bed width of the Distributary 0.40 m 0.40 m
Deth of water in the Distributary !D1" 0.30 m 0.30 m
#ree Board of the Distributary 0.15 m 0.15 m
$ana% Bed &e'e% in Distributary (& 4)2.1*1 m (& 4)1.1*1 m
#u%% Su%y &e'e% in Distributary (& 4)2.4*1 m (& 4)1.4*1 m
#ree Board &e'e% in Distributary (& 4)2.+41 m (& 4)1.+41 m
,round &e'e% (& 4)2.--) m (& 4)2.--) m
e%ocityin $ana% 0.4* m/sec 0.4* m/sec
YD"A#$%C D&'%() :
1* $ength of Crest +$,
$ ! 0.40 m
he %ength of the crest is same as the U/S bed width of the cana%
2* Determination of Crest $eel
ectangu%ar tye crest wa%% is designed
Discharge !"
0.30 m
ead o'er $rest inc%uding roaching ead e%ocity
0.125 1.)4 6 0.400 6 5/3 / ! 0.30 "1/+
eight of $rest 0.30+ m
0.4* m/sec
U/S e%ocity ead
0.012 m
U/S .(.&
4)2.4*1 7 0.012
(& 4)2.503 m
.& of $rest $S& U/S .(.& 8
4)2.503 8 0.30+
$S& &$ ./2*19 m 9
eight of $rest abo'e U/s bed %e'e% 1 0.00+ m
0.4* m/sec
D/S e%ocity ead 0.012 m
D/S .(.&
4)1.4*1 7 0.012
(& 4)1.503 m
1.)4 6 & 6 3/2 6 ! / Bt "1/+
where Bt !crest width"
U/S e%ocity of aroach !a"
a2/ 2g
U/S #S& 7 ! a2/ 2g"
D/S e%ocity !d"
d2
/ 2g
D/S #S& 7 ! d2/ 2g"
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Design of Vertical Drop of 1 m at Ch: 21960 m of DY-10 under DC-1
* 'hape of the Crest
& of crest 8 D/S Bed %e'e%
4)2.1*- 8 4)1.1*1
1.00+ m
0.55 1.00+
0.552 m
Say 0.+0 m
.* Calculation of Cistern Dimensions
a" Deth of cistern :
1.00 m
: 0.11 m
'a 0.15 m
b" By arshney ;ethod
: dc/3
where
< 0.313 cumec/m
dc 0.215 m
Deth of cisterndc/3 0.0-2 m
dot Deth of $istern 0.15 m
$istern &e'e% D/S Bed &e'e% 8 :
$istern &e'e% (& 4)1.041 m
$ength of cistern
&ength of cistern 5=>&
2.)0 m Say 3.00 m
?ro'ide 3 m of %ong cistern at .& of 4)1.041 m
3* Design of Curtain 4all
@idth of $urtain @a%% on U/S A D/S assumed 0.30 m
a" D/S $urtain @a%%
Deth of water
7 0.+02
0.3 / 2 7 0.+0
0.-50 m
Say 0.-5 m
b" U/S $urtain @a%%
Deth of water
7 0.+03
0.3 / 3 7 0.+0
0.-00 m
Say 0.-0 m
$rest width at to Bt 0.55
2
2 eight of $rest abo'e D/S Bed &e'e%
2
$rest width at to B t
!1/4" 6 ! 6 & "2/3
& ead &oss
dc
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Design of Vertical Drop of 1 m at Ch: 21960 m of DY-10 under DC-1
6* %mperious 5loor
his e6tends from U/S $urtain @a%% to D/S $urtain @a%% . he f%oor shu%d be designed to resist the ma6imu
Ustream of the weir the Emer'ious #%oor may be of th 0.3 m !nomina%" as the deth of water itse%f wi%% co
#%oor &ength 1.5 6 D 0.450 m
Say 0.50 m
$a%cu%ation of U%ift ?ressure
ead of @ater causing U%ift $S& 8 D/S $B&
1.00- m
!1/3" n 7
&w 1/3 !0.5 7 0.+ 7 3 7 0.3 7 0 .3" 7 ! 0.- 7 0.00+1)-+14+-)*35*2 7 1.00+
&w 4.1-* m
1. $ree %ength at t
1/3 !0.5 7 0 .3" 7 ! 0.- 7 0.00+1)-+14+-)*35*2 7 1.00+ 7 0.15"
2.12* m
u%ift
u%ift ?ressure 0.4*4 m
h re
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Design of Vertical Drop of 1 m at Ch: 21960 m of DY-10 under DC-1
Chec for 'ta7ilit of Crest 4all :
0.+0 m (& 4)2.1*- m
1.15+ m
(& 4)1.041 m
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Design of Vertical Drop of 1 m at Ch: 21960 m of DY-10 under DC-1
Soi% tye B$ Soi%
Soi% roerties G
f
1.)0 t / m3
0.333 0.333
eight of $rest wa%% (& 4)2.1*- 8 (& 4)1.041 1.1+ m
0.5 6 0.333 6 !1.)0 8 1.0" 6 !1.15+
0.1-) t / m8erturning oment :
0.1-) 6 1.15+ / 3 0.0+* t 8 m
@t of concrete 0.+0 6 1.15+ 6 2.4 1.++5 t
'ta7iliing oment :
1.++5 6 0.+0 / 2 0.50 t 8 m
#.H.S. against o'erturning 0.5 / 0.0+* -.25 91.5
m 0.+5
#.H.S. against o'erturning 0.+5 6 1.++5 +.0- 91.5
0.1-);ase
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!assumed"
(& 4)1.4*1 m
ence HI
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U%ift ressure %ie%y to be occured.
nter ba%ance the U%ift ?ressure.
0.157 0.-5"
0.75 m
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!Safe"
!Safe"
10 m
0.330 $umecs/m
0.51 m
0.-+ m
0.4+ m0.50 m
is adoted.
!S "