How do ponds stay full?
How do ponds stay full? The material isn't very permeable, which means it can keep the liquid from passing through it. “Over a long, long time, the bottom of the pond itself evolves and changes,” Wu said. “The materials settle and the little particles, or sediments, fill in the large pores.”
Do ponds eventually fill in?
If left alone, the pond or lake will eventually fill in completely, and become a swamp or wetland at best. Most existing farm ponds fall in the eutrophic category and need help quickly to slow the aging process.