Volcanic ash and lahar contribute to the siltation and sedimentation of the river system,
especially during the rainy season. Regular desiltation at an estimated P 60-P70 M annually is
needed, but funds from the DPWH are often not available and desiltation activities are dependent on other sources of funding.
The drainage systems of the City consist of underground pipelines in the commercial areas
and open or covered canals in most residential areas. Several have no drainage systems at all
Flooding is a chronic, life-threatening problem in the Sta. Rita area of the City.
A more comprehensive approach is proposed: to prepare flood control and drainage master
plans for the Layac-Balsic and Sta. Rita River systems to localize major problems and alleviate
them.
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