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Message: [QUOTE="Waterbug, post: 145379, member: 2322"] I think it's best to fill up to where a hole will be and then cut. I'd say you have what would be called a river flow system (Google "koi pond river flow"). Whether a stream entering the pond sweeps some amount of bottom depends on lots of things. GPH of course but also the shape of the water where it enters, depth, the shape of the pond, etc. But also very important is what you consider to be acceptable is going to play a big role in your final opinion. In general I think water garden keepers seem pretty happy with whatever results they get which is good. In higher end Koi ponds keepers seem to expect a certain level going in and then test to that level and are unhappy if not met. From what I've read by Koi pond keepers over the years they seem generally unhappy with streams keeping pond bottoms clean. The water just dissipates too much. It doesn't look like you have any bottom drain or filter system for removing muck so I don't see where it would be important to have a sweeping current. But maybe I missed that. For streams coming into a pond I like to build a [url="https://www.gardenpondforum.com/topic/10371-if-you-could-start-all-over/page__p__141155__hl__catch%20basin__fromsearch__1#entry141155"]catch basin[/url]. That way 100% of your water flow can be directed exactly as you like, just like using a pipe. [/QUOTE]