A world with a natural water cycle has rivers which generate a lot of transportation and ecological benefits. But gravity and sunlight drive those engines. An artificial domed community doesn’t have that unless it can somehow emulate the water vapor / rain cycle without cost. But In the case of a domed city on a planet with no water bodies, fluvial systems still would serve to disperse sediment and nutrients, as well as move wastes from the ponds and lakes to and from the surrounding soil.
I am worldbuilding a domed city on a planet with no water bodies. The city has ponds and lakes for aquaculture, biodiversity conservation, and food.
My city is on a hot dead world which is capable of generating a water vapor cycle using ambient heat outside the city, and my city does emulate a rain cycle. I don’t think it’s generating enough volume to maintain a river however, or that would be a fairly lumbering river if it were. Also, creating steam is only half of the equation. I have to condense it into rain at a large energy cost.
So I don’t think it’s feasible to rely on a rain cycle to drive the engine of rivers for cleaning and maintaining healthy water bodies, thus it seems like a completely separate fluvial system is needed anytime lakes or ponds are incorporated into an enclosed colony with no natural rain cycle.
Would it be necessary to have fluvial systems in this city?
And a corollary to this: what would such a system look like? Turbines seem bad for aquatic and lacustrine life. Waves seem bad as well due to erosion. What moves the water back uphill then?