Changes in characteristics due to land use
change and global warming in the Lower Bengawan Solo
Sub-watershed have resulted in a decrease in the
availability of water in the watershed. This significantly
affected the availability of raw water for drink water for
Gresik Regency, as the worst occurred in the extreme dry
month of 2018 for four months (June – September).
However, this raw water shortage will be fulfilled if the
construction of the barrage Sembayat is completed. With
the construction of this infrastructure facility, Gresik
Regency is planned to get additional raw water services of
up to 1,000 liters per second; so that the local PDAM can
guarantee the fulfillment of 3K elements (quality,
quantity and continuity) throughout the years of service.
Currently the raw water shortage in October is proposed
to get a water supply of 40% of the total intake for the 1st
and 2nd daily tenths Period, while for the 3rd daily tenth
period it is 20%. In order to anticipate the condition of
decreasing water availability in the downstream
Bengawan Solo Sub-watershed, an integrated watershedbased water resource management policy is needed, so
that there is a suitability management of one river, one
plan and one management from upstream to
downstream. This is done in order to maintain the
sustainable water supply for many aspects in sustainably.
Keywords : water resource management, raw water utilization, continuity.