Update, Saturday 25 July 09:
I took the Radar-mobile (aka: TMR - 'toyota, mobile radar') out for a spin last night, and took some screen images at Capitol Lake to compare with those from 2 years ago. Dramatically fewer bats over the water, and almost none over the mudflats. Not a surprise. Previous times the Radar unit showed that they were all over the lake's 3 chambers, the fewest were over the river channel (faster water, fewer insects?). That is the only place water has remained during this draining event. So even the little remaining water may be of little value to these bat moms struggling to feed themselves and their pups back at the nursery colonies, who are by now getting to be teenager size (and yes they are still nursing them!).