if we progress on with our projections of where sea level is going, the horizontal red bar represents the lowest elevation of our current weir structures. if we look at ipcc projections, for example, of where tides are going, it doesn't take too long -- not too many years, maybe about 2013, 2014, we get to a point where at peak tides we have very regular occurrences of bay water actually topping the weir and coming back into our system. the bad news is we actually see this happening now. the photo on the left is that same structure you saw discharging in a previous slide. the weir structures are the slots underneath. the lower right photo you are seeing a high tide that is actually not happening on a stormy day, not when we're having a lot of wind and tidal surge; it's just a very high tide that's actually topping over the weir and coming back into our system. the problem that we face i think is represented very well here in that if this becomes -- right now this is maybe a several times, several days a year event. probably it occurs for several hours and then stops. so we can sort of