IRRIGATION canals and drainage
ditches often require periodic cleaning
to remove wind-blown or water-deposited
sediments. Ponds used to trap sediment
from irrigation runoff and food processing
wastewater also require periodic
cleaning if they are to remain effective.
The freshly removed sediment is usually
piled next to the canals or ponds for drying
and temporary storage.
Dredge materials often are stored near
the source until the piles become so large
they constitute a nuisance. Removal then is
necessary. Sediment piles frequently remain
in place for 10 years or more