How do I stop with pond-less water feature flooding?

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This year I redesigned my garden to get rid of my lawn, best thing I ever did! We love the result. I put in a small stream with a 1000 lt sump , the man with the digger got a bit carried away I feel!! At first I was topping it up every day due to evaporation and porous Stone, had to change them! I therefore only ran it 4hrs a day ,when we would be out sitting. Now we have had rain the sump is filling very quickly, should I just run the water fall/stream for longer and if so how long roughly. Thanks everyone.

q how do i stop w pondless water feature flooding
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