MOH. ARDIANSYAH, MOH. ARDIANSYAH (2022) KAJIAN TEKNIS SISTEM PENYALIRAN PADA TAMBANG ANDESIT DI PIT I PT. HARMAK INDONESIA KECAMATAN KOKAP KABUPATEN KULONPROGO DAERAH ISTIMEWAH YOGYAKARTA. Other thesis, UPN 'Veteran" Yogyakarta.
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Abstract
RINGKASAN
Sistem penyaliran pada PIT I PT. Harmak Indonesia perlu dikaji lebih dalam
lagi terlebih ketika musim hujan, karena ditemukan genangan air terutama pada
ramp sehingga diperlukan saluran terbuka dan gorong-gorong untuk mengalirkan
air tambang keluar dari permukaan kerja, selain itu dibutuhkan kajian terhadap
kolam pengendapan apakah dapat menampung air limpasan dan mengendapkan
partikel tanah yang terbawa bersama dengan air tambang dari permukaan kerja
atau tidak.
Metode yang digunakan untuk menghitung curah hujan rencana yaitu
metode Distribusi Probabilitas Log Pearson III, Perhitungan Intensitas hujan
menggunakan rumus Mononobe, Penentuan luas daerah tangkapan hujan, Debit
air limpasan dihitung dengan rumus rasional, dan perhitungan dimensi saluran
terbuka dan gorong-gorong menggunakan rumus Manning.
Berdasarkan kajian teknis sistem penyaliran tambang dengan curah hujan
harian selama 11 tahun (2010-2020), diperoleh curah hujan rencana sebesar
151,72 mm/hari, intensitas curah hujan sebesar 25,29 mm/jam dengan periode
ulang hujan selama 5 tahun, resiko hidrologi sebesar 98,85 %, luas DTH yang
masuk ke permukaan kerja sebesar 0,05 km2
, dan debit air yang masuk sebesar
0,33 m
3
/detik.
v
SUMMARY
The drainage system at PIT I PT. Harmak Indonesia needs to be studied
more deeply, especially during the rainy season, because puddles are found,
especially on ramps so that open channels and culverts are needed to drain mine
water out of the work surface, besides that, a study on settling ponds is needed to
see if they can accommodate runoff and precipitate water. soil particles carried
along with mine water from the work surface or not.
The methods used to calculate the planned rainfall are the Pearson III Log
Probability Distribution method, the calculation of the rain intensity using the
Mononobe formula, the determination of the area of the rain catchment area
software, the runoff water discharge is calculated by a rational formula, and the
calculation of the dimensions of open channels and culverts. using Manning's
formula.
Based on a technical study of the mine drainage system with daily rainfall
for 11 years (2010-2020), obtained a planned rainfall of 151,72 mm/day, rainfall
intensity of 25,29 mm/hour with a rain return period of 5 years, risk hydrology is
98,85 %, the area of DTH entering the mining front is 0.051 km2
, and the
incoming water discharge is 0.3227 m
3
/second.
vi
| Item Type: | Thesis (Other) |
|---|---|
| Uncontrolled Keywords: | TAMBANG ANDESIT |
| Subjects: | T Technology > TA Engineering (General). Civil engineering (General) |
| Divisions: | Faculty of Engineering, Science and Mathematics > School of Engineering Sciences |
| Depositing User: | Eko Yuli |
| Date Deposited: | 21 Mar 2022 02:10 |
| Last Modified: | 22 Jun 2022 08:51 |
| URI: | http://eprints.upnyk.ac.id/id/eprint/29091 |
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