For those of you out of Portland, Mount Tabor (on of the many volcano's with in Portland's city limits) has two very picturesque water reservoirs that hold drinking water for Portland. Due to terrorist/jackass concerns Homeland Security has deemed that the reservoirs need to be capped/covered. This has the community up in arms because they don't want to loose the beauty of these large ponds.
Maybe I'm taking a simplistic view, but why don't they drain the reservoirs, build an underground reservoir, and then put the lake back on top, but only wading depth? The reservoirs will them be capped, and the parks appearance would be unchanged.