Hokey? Not looking at it from this end. I think you've put a lot of thought and planning into it. How much head did it say it needed to gravity flow 240 gpm?

The patio looks great! Having just spread out 80+ yds of black dirt with a 1/3 cu yd bucket on a Kubota, then using a Harley Rake to smooth it out over an acre to get the seed bed ready for drilling in grass seed, I feel your pain!


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[Linked Image from lh6.ggpht.com]
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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).