Our pond/brook bed is of stone pebbles. Our waterfall runs continually- we don't turn it off and on. I would not recommend turning it off and letting water stand.
Should we leave town, a neighbor checks the pond periodically if it is hot and there has been no rain. She adds water from our garden hose (takes about 5 minutes) if needed.
Most of the year, I don't need to add water at all.
And P.S. We hear the water- we don't hear the pump running. Submersible pumps have variable speed adjustments as well, gentle flow to forceful flow, as you prefer.
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