Tugas Mata Kuliah Spab

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TUGAS MATA KULIAH SPAB/DRAINASE

Nama

: Syarifah Suri

NIM

: 2017339070

Diketahui : a. b. c. d. e.

Q rancangan : 2,3 m3/dt Jenis tanah : Lempung Lebar tanah : 5,5 m Kemiringan lahan : 0,001 Aliran pada soal diatas menyilang jalan. Lebar : 8 m. Elevasi muka air hulu ( sebelum menyilang jalan) 1m dibawah muka jalan.

Ditanya : Rencanakan bangunan silang tersebut. Hitunglah elevasi muka air hilir terhadap muka jalan. Jawab : - Tanah lempung : kemiringan dinding 0,5 – 1 m - Luas Penampang (A)

: b x h = h2

- Keliling basah (P)

: b + 2h= h +2h=3h

-Jari-jari Hidroulis (R)

: A/P = h2/3h = 0,333 h

- Kecepatan aliran V

: V=1/n . R2/3. S1/2

- Tinggi jagaan

: 25%

- Jadi tinggi saluran ( H) : h = tinggi jagaan Q = A/V

= A. 1/n . R2/3. S1/2 =

h2 x 1/0,5 x 0,333h x 0,0011/2

h=2,45m maka LA = 2.5 x h2 LA = 2.5 x (2.45 m)2 LA = 15.0063 m2 Lebar dasar = 1.5 x h = 1.5 x 2.45 = 3.675 m

Tinggi jagaan

= 25% h = 0,6 m

Tinggi Air

= h + tinggi jagaan = 2.45 m + 0.6 m = 3.06 m

Air

2

2.45

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