Voclanic ash was removed from this drainage canal at Clark
Air Base in the Philippines to permit the free flow of
water. The 1980 eruption of Mount St. Helens demonstrated the
importance of preventing as much ash as possible from entering
storm drainages and sanitary sewers in order to limit ash from
invading waste-water treatment facilities. Residents must help
in preventing ash from entering the hundreds or thousands
of storm sewers, "manhole" covers, and storm-drainage
systems in their community, especially during clean-up
operations.
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