drainase unmer

drainase unmer

KONTROL KECEPATAN 2 A = = = h 1,828 1,828 * 1,113^2 2,234 m^2 QRan. Sistem = = = = m /detik 5,212 Q/A 5,212/2,234

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KONTROL KECEPATAN 2

A

= = =

h 1,828 1,828 * 1,113^2 2,234 m^2

QRan. Sistem

= = = =

m /detik 5,212 Q/A 5,212/2,234 2,334 m/detik

U

2

Karena, u > umaks = 2 m/detik maka Penampang tidak Aman, sehingga diperlukan desain ulang ke-2. DESAIN ULANG KE-2. A

=

QRan. Sistem

1,828h^2 1,828h^2 h^2 h

= = = =

umaks 5,212/2 2,606 1,425 1,194

b b b

= = =

0,828*1,270 0,989

= = = = = =

(1/n)*R^(2/3)*Sf^(1/2) (1/0,02)*(0,5*1,194)^(2/3)*So^0.5 50 X 0,709 X So^0.5 2/(50*0,709) 0,056 0,0032

jadi, nilai Sf : meaning, Umaks 2 2 So^0,5 So^0,5 So

m

0,828.h

R=0.5h

SALURAN 4 bentuk saluran tinggi saluran lebar saluran

= = =

0,60 m 0,60 m

U = (1/n). R2/3. Sf1/2 Q Q

=

A.U

=

2

2.h 2.h2

X

Q 0,623 h^(8/3)

= = =

h

=

0,455

m

b

= =

2h 0,911

m

X 5,079 0,123

X

KONTROL KECEPATAN A

QRan. Sistem U

R2/3

Sf X (1/0.02).(0.5h)^(2/3).0,0065^0.5 h^(8/3) (1/n)

2

= = =

2.h 2*0,510^2 0,415

= = = =

m /detik 0,623 Q/A 0,623/0,415 1,503 m/detik

m^2

Karena, u < umaks = 2 m/detik maka Penampang Aman.

2

1/2

Sf=So