Is TID pulling a fast one?

As I discussed in this post, Tumalo Irrigaion District is asking taxpayers to pay the full $42M+ cost of piping their irrigation canals.  They claim in their Draft Environmental Assessment that piping will conserve about 48 cfs (page xxvii) which they will return in-stream.  BUT, page D-20 of the appendix contains a table showing increased water deliveries to irrigators after piping is complete.  Where does this water come from?  Why is it not being returned to the river?  Why is on-farm conservation not being pursued to REDUCE usage?  You have until May 22 to submit your comments.