I'm trying to power (among other things) a pump stack using water wheels in my brook. Unfortunately, it appears that the pump stack's intake (which is only a single screw pump at ground level) is draining enough of the water from the brook that most of it is now too shallow to power my water wheels:
(http://img.photobucket.com/albums/v322/azurasstar/dfbrookpump_zpsdc842691.png)
(http://img.photobucket.com/albums/v322/azurasstar/dfbrookshallow_zps54dcd4d1.png)
It would be possible, though irritating, to move my ground-level intake pump north so that it no longer drains from the area the water wheels are (the brook flows south>north, so everything south of the pump is still 7/7). Is there a better or easier solution?
Also, I don't remember this problem existing when I first set up the pump stack (I think I've had it up and running a year or two). Is the shallow stuff somehow time-dependent, or related to the fact that the brook freezes? Or do screw pumps just really drain that much water?
Thanks!