A Progressive Pump would be much better to use than a Diaphragm Pump. At 400 GPM, most processing facilities recognize that a Trash Pump would be the better fit for the application. I'm talking about a Hydromatic brand pump. If you want "ideal" configuration, a Hydromatic at the River inlet...
I wouldn't use a Waukesha. I would go with a Progressive Cavity pump. Seepex is the best.
Waukesha cannot run dry and the cost to repair these beasts is enormous. The timing gears in these pumps are not that easy to put together. So, if you're running a small maintenance staff or you have to...