The phrase "send the river" can be used in a variety of ways, such as referring to releasing water from a dam or redirecting the flow of a river. However, if you're looking for synonyms to convey a similar message or tone, there are several options. For example, you could use the phrases "release the floodgates," "unleash a torrent," or "channel the current." If you want to emphasize the idea of redirecting water, you might use terms like "divert the stream," "reroute the flow," or "direct the runoff." Each of these synonyms can help you convey the intended meaning more effectively and add variety to your writing or conversation.