In a water cycle, why would the amount of sediments remain same in a pond?

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The water cycle doesn't really have anything to do with sediment. In geologic cycles, i.e. carbon or nitrogen, sediments play an important role. Water, as opposed to the geologic cycles, can move down into the earth to recharge aquifers. It can also sink to the bottom of the ocean if it is cool, or it can simply evaporate and subsequently condense to clouds.Sediment is involved in the cycle of phosphorous, nitrogen, and carbon. Sediment may remain in a pond, but only for periods of time. Geologic time can be slow and the resulting uplift could be millions of years later, or it could be quick if the pond were drained and any peat removed for fuel and burned or terrerstial vegetation moved in as a result of succession. So, if it's sediment think geological cycles, but if it's water think evaporation and condensation.