ESTIMATION OF GROUNDWATER POTENTIAL OF PENAJAM REGION TO SUPPORT THE NEED FOR CLEAN WATER IN IKN PENAJAM EAST KALIMANTAN

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Arie Herlambang Soeseno

Abstract

Ground water is a source of water that can be used to support the clean water needs of the certain area.
Water sources can be from springs or pumping from shallow (<40 meters) or deep (generally> 40 meters
to 200 meters) depths groundwater. The geological conditions of an area determine the location, area of
distribution and the position and composition of the rock that acts as an aquifer. As an initial identification
of shallow groundwater, it can be done from resident wells in the study area, while for groundwater
information is obtained from drilling that has been carried out in the study area, especially information on
pumping tests that have been carried out. Low groundwater potential is found in the western part and partly
in the center of the IKN area. Shallow groundwater is found at a depth of 20 meters (below ground level,
bmt), groundwater levels can be found at a depth of 5.3 m (bmt), permeability (K) is around 0.03048 m /
day, with transmissivity (T) around 11.14836 m2 / days, with optimal discharge (Qopt) 0.1183 liters / second
at a distance between wells (2R) 78.4 m and with a good water quality. Depressed groundwater can be
found at a depth of 32 - 117 m bmt, with a static groundwater level of 9.25 - 28 m bmt, permeability 0.0064
- 0.4572 m / day, transmissivity (T) ranging from 0.2508 to 20,4387 m2 / day, optimal flow rate 0.1183 -
0.9077 l / second, with between wells 87.19 - 170.07 m, with a good water quality. The area of the IKN
candidate location itself is in a plains area, which is dominated by moderate potential aquifers, with aquifer
depths ranging from 150 - 350 m, groundwater levels of 1 - 4 m below ground level, permeability (K) ranging
from 9.6 x 10-6 - 1.1 x 10-5 cm / second, and transmissivity (T) 0.003 - 0.004 m2 / day, the optimal discharge
is 10.8 - 27.5 liters / second. Potential areas for IKN locations with high potential aquifers, located in the
south of the IKN area, especially towards the coast, are found at a depth below ground level of 150 - 350
meters, groundwater level 1 - 4 m, permeability (K) ranges from 9.6 x 10 -6 - 1.1 x 10-5 cm / second, and
transmissivity (T) 0.003 - 0.004 m2 / day, the optimal discharge is 10.8 - 27.5 liters / second.

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