DESIGN ANALYSIS OF FILLING VOID D2 WITH BINUNGAN RIVER WATER AT PT BERAU COAL KALIMANTAN TIMUR
the activity will leave voids. Environmental issue in void are common in the quality of post-mining lake water which contain acid. Management of pit lakes is needed to meet environmental quality standards by accelerating the period of acid oxidation in rocks. One of the option is to put river wat...
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| Format: | Final Project |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/71522 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | the activity will leave voids. Environmental issue in void are common in the quality
of post-mining lake water which contain acid. Management of pit lakes is needed
to meet environmental quality standards by accelerating the period of acid oxidation
in rocks. One of the option is to put river water into the void so that can speed up
void D2 filling.
Binungan site D2 voids are filled using Binungan river water during flood
conditions. The watershed chosen to fill the void must know the flood
characteristics by calculating the flood event from the rainfall data analysis. By
using BMO1 station rainfall data for the period 2005-2021, a Gumbell distribution
plan rainfall of 83.08 mm was obtained, which resulted in a plan rainfall intensity
of 11.43 mm/hour. The topography and land use data of the Binungan watershed
resulted in a catchment area of 136 km2 and a river length of 35 km. Binungan
watershed land characteristics are secondary dry forest with a slope of 0.04%. Then
the results of rainfall intensity and watershed area will be obtained synthetic unit
hydrograph soil conservation service (SCS). After that, a simulation of the
calculation model was carried out with HEC RAS software to obtain the
relationship between the discharge and the water level in the cross section of the
canal at various channel dimensions with water inflow level at +4 and +5 masl.
By analyzing rainfall data, it was found that flood events ranged from 30-120 days
at return periods of 2, 5, and 10 years with the peak water level at RS4000 during
floods at elevation +6 masl. The option of filling void D2 from the Binungan River
can be carried out at the level of +4 masl at RS4000 east of void D2 with the
dimensions of the channel bottom width of 3.5-4 meters for one year with many
events 30 times from rainfall intensity. |
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