CENGKLIK RESERVOIR PERFORMANCE AND ITS ROLE FOR DROUGHT MITIGATION
Abstract: Water availability
problem is encountered by Cengklik Reservoir due to drought disaster in the
current year. It causes irrigation water crisis over 850 hectares crop field
which of 350 hectares were not cultivated. The risk that must be faced by
farmers is decrease in potential productivity, losses about more than 2.5
billion. Therefore, it needs technical solution to reduce this drought disaster
risk. To obtain an alternative solution against water availability problem for
drought disaster mitigation, this research used optimization of reservoir
standard operating simulation. It applies field area of rice or Palawija at the
second and/or the third cultivation season as decision variable, maximum
productivity value as objective function, irrigation water demand as parameter
depending on specified alternative crop pattern and schedule, and several
constraints comprising 100% of reservoir reliability, all field is irrigated at
the first and second season in which maximum non-irrigated crop field at the
third cultivation season are 300 hectares. The tool used to conduct
optimization was Microsoft Excel software. The result showed that crop pattern
considered as an alternative solution against water availability problem in
Cengklik reservoir is paddy-paddy-maize at the early of November II cultivated
over 433 hectares and 1524 hectares. Risk reduction reached 9.33% in term of
reservoir reliability, 23.61% in term of irrigated area, and 27.29% in term of
vulnerability towards water availability crisis.
Author: Yovi Hardiyanto
Journal Code: jptsipilgg150048
