NOTAHUNXi (mm)Xrata-rata Xi (mm)(Xrata-rata - Xi)2 (mm)

12001106,1220,695428,283025

2200287,0221,5972,550409

3200355,51-29,915894,907225

4200447,639-37,7861427,781796

5200535,482-49,9432494,303249

62006110,9625,535652,036225

72007109,24923,824567,582976

82008116,53831,113968,018769

9200965,914-19,511380,679121

102010119,81634,3911182,740881

Jumlah (mm)854,258998,883676

Rata-rata (mm)85,425

Standar Dev31,62082

Tugas ke 5 Sistem Penyaliran Tambang Nama:NIM:Kelas : 03

R24 = Xrata-rata +

R24 = 85,425 +

R24 = 118,88 mm

I = 2/3

I = 2/3

I = 4,95 mm/jam

Luasan bottom pit= 1.153.106,4072 m2 = 1,1531 km2Luasan disposal atas= 595.607,6343 m2= 0,5956 km2Luasan disposal bawah= 465.653,1746 m2= 0,4656 km2

Curah hujan rencana 10 tahun

XT = Xrata-rata + (Sx x ) X10 = 85,425 + (31,62 x )X10 = 143,87 mm

1. debit air limpasan ke bottom pitQ = 0,278 . C . I . A Q = 0,278 x 0,9 x 4,95 mm/jam x 1,15 km2Q = 1,428 m3/detik2. debit air limpasan ke area disposala. Disposal atasQ = 0,278 . C . I . A Q = 0,278 x 0,75 x 4,95 mm/jam x 0,595 km2Q = 0,614 m3/detikb. Disposal bawahQ = 0,278 . C . I . A Q = 0,278 x 0,75 x 4,95 mm/jam x 0,465 km2Q = 0,480 m3/detik3. total debit air limpasanQtotal = debit air limpasan ke bottom pit + debit air ke disposalQtotal = 1,428 m3/detik + 0,614 m3/detik + 0,480 m3/detikQtotal = 2,52 m3/detik4. debit air hujanQ = curah hujan rencana x DTHQ = 143,87 mm/jam x 2,21 km2Q = 3,68 m3/detik5. debit air tambangQ = debit air hujan + total debit air limpasanQ = 3,68 m3/detik + 2,52 m3/detikQ = 6,20 m3/detik