Received: 15 June 2017 / Accepted: 15 January 2018/ Published online: 14 February 2018
Tacloban, Philippines, the city most harshly devastated by typhoon Haiyan in 2013, faces severe water supply constraints, particularly on the relocation sites;
Through hydrological modeling with QSWAT, the resilience to climate change impacts of the three waterways supporting two possible supply solutions was evaluated;
Tacloban will likely face water scarcity, as the percentage of days in which the rivers flow does not meet the withdrawal demand reaches up to 25% for some periods;
Constructing infrastructure to regulate rivers flows is highly recommended;
The tapping of the northern rivers (Pongso and Cabayugan) is expected to bring multiple benefits.
Philippines, the city most devastated by typhoon Haiyan in 2013, faces severe
water supply constraints, particularly on the relocation sites that are
expected to accommodate 40% of Tacloban's population by 2018. This region's
hydrological system was modeled using QSWAT to evaluate the impacts of climate change,
namely, rising temperatures and variation of rainfall patterns, on three rivers
(Binahaan, Pongso, and Cabayugan). These rivers are the potential sources of
water for the two supply solutions currently being considered. Thus, it is
essential to assess their resilience as sources of water. Two climate scenarios
were generated for 2020 and 2050 using the Change Factor (CF) method, and the
system response was compared to the baseline data (1979–2010).
show that, regardless of the chosen supply solution, for certain time periods
(most severely for the quarter of March to May), the percentage of days in
which the river flows were insufficient to meet the proposed water catchment flows
was significant (reaching up to 25%). Outputs also suggest that Binahaan River,
where the current water catchment is located, may fail in providing sufficient
water to the region for future scenarios. However, it should be noted that
Pongso and Cabayugan Rivers in northern Leyte can represent a resilient water
source to supply the new resettlement areas.