| Summary: | The objectives of the study are to map the distribution of rainfall in Java, to
analyze its potential and the impact to groundwater storage. To achieve those
goals, rainfall distribution is mapped using isohyet method. From the average
distribution of monthly rainfall, the annual potential of rainwater on every
watershed was calculated. Afterwards, the groundwater storage was analyzed and
counted by applying the water balance concept. The results of the study show that
the mean of the highest annual rainfall is 4082 mm which occurs on Cisadane-
Ciliwung watershed and the lowest one is 1421 mm on Citarum Hilir watershed.
From the rainfall potential, Cisadeg-Cikuningan watershed has the highest rainfall
potential at the amount of 25342 million m31month and Grindulu Panggul
watershed has the lowest potential at the amount of 3678 million m3lmonth.
Meteorologically, Cisadeg-Cikuningan watershed has the highest groundwater
storage at the amount of 6088 million m31yearand the lowest amount of it occurs
on Madura watershed at 78 million m3lyear.
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