ANALYSIS OF THE AVAILABILITY OF WATER RESOURCES AND CONSERVATION EFFORTS SUB DAS LESTI DISTRICT OF MALANG

Abdul Somat Bukori, Rachmat Boedisantoso

Abstract


Lesti sub basins is one of the upstream part of the Brantas river basin located in the district of Malang. Conditions Lesti sub-basins have been damaged thereby potentially experiencing a water deficit. The deficit of water in the dry season in 2017 amounted to 2.141.057 m³ and 2023 amounted to 3.881.593 m³.To overcome these deficits conservation efforts both vegetation and mechanically. Area of land required until 2023 with the planting of agarwood trees covering an area of 18,27 km², covering an area of 15,53 km² and a bamboo plant Poran 51,75 km². Needs rainwater harvesting roofs media as much as 3 sump capacity of 24 m³. Embung needs as much as 3 each reservoir capacity of 800.000 m³.  Embung investment costs Rp. 207 205 545 000, - done in 2017 until 2018.Financial aspects of the construction of the water reservoir with an interest rate of 7% per year IRR = 13,19%> 7%; BCR, i (7%) = 1,34> 1 and NPV, i (7%) = Rp. 91.152.353.632,-. The construction of such Eligible.

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DOI: http://dx.doi.org/10.12962/j20861206.v32i1.4503

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