Water Balance Assessment, Land Use Land Cover Change and Increasing Water Demand in Three Major Watersheds in Jember, East Java, Indonesia

Authors

  • Indarto Indarto Department of Agriculture Engineering, Faculty of Agricultural Technology, University of Jember, Kalimantan St. Number 37, Jember, East Java, Indonesia http://orcid.org/0000-0001-6319-6731
  • Entin Hidayah Department of Civil Engineering, Faculty of Engineering, University of Jember, Kalimantan St. Number 37, Jember, East Java, Indonesia http://orcid.org/0000-0002-1233-6850
  • Erwan Bagus Setiawan Study Program of Agricultural Water Resources Management, Faculty of Postgraduate, University of Jember, Kalimantan St. Number 37, Jember, East Java, Indonesia

DOI:

https://doi.org/10.19184/geosi.v8i2.39131

Keywords:

Supply, Demand, Water Balance, WEAP, Jember, East Java

Abstract

Jember  Regency  is  the  third  largest agricultural  area  in  East  Java Province. Expansion   of   built-up   and   agricultural   areas   occurred   and   significantly changed  the  landscape.  Moreover,  increasing  both  types  of  land cover  will increase   water   consumption.   Therefore,   there   may   be   changes   in   the condition  of  the  water  balance  in  the  Jember  Regency  area.  This  area  has three   major   watersheds:   Bedadung,   Mayang,   and   Tanggul.   This   study evaluated  the  water  balance  condition  at  the  three  major  watersheds  in Jember,  East  Java,  Indonesia.  The  WEAP  (Water  Evaluation  and  Planning) model   calculatedthe   water   balance.   Research   procedures   include   (1) inventory of spatial and non-spatial data; (2) setup of the WEAP scheme; (3) Calibration;  (4)  Validation;  and  (5)  Simulation  of  water  balance  model  in scenario increasing water demand and land-use change). From 1997 to 2020, the  water  balance  was  evaluated  using  a  10-day  interval.  The  results  show that from the November 1st to August 2nd periods, the watershed can supply all demand sites with 100% coverage. However, from August 2nd  to October 3rd  periods, the watershed’s ability to supply the water needs decreased. This deficit is due mainly to the uneven rainfall distribution between rainy and dry  seasons.  Variation  in  annual  rainfall  received  from  1997  to  2020  also affects the water balance’s surplus and  deficit.  The  fluctuation  of  land-use change contributed to the surplus and shortage of water balance.

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Published

2023-08-29

How to Cite

Indarto, I., Hidayah, E., & Setiawan, E. B. (2023). Water Balance Assessment, Land Use Land Cover Change and Increasing Water Demand in Three Major Watersheds in Jember, East Java, Indonesia. Geosfera Indonesia, 8(2), 170–188. https://doi.org/10.19184/geosi.v8i2.39131

Issue

Vol. 8 No. 2 (2023): GEOSFERA INDONESIA

Section

Original Research Articles

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