River Flow rate affected by Depth?

I have been trying to tune the River wave scale with no luck. Unlike the ocean and lake, river does not seem to have an associated input for the Gerstner wave properties. So I found a work around which was to decrease the depth of the river which gets me close to the ripple scale I want but now the River is not flowing. I imagine these are all connected in some graph somewhere but after exhaustively watching Youtube’s and searching forums I haven’t had any luck.

So can someone either help me understand how to tune the Gerstner waves on a River body… OR … Help me understand where I can go to rebalance the relationship between the depth and flow rate.

Thank you