the photo, where you kind of see the water going off a cliff and then on the far right is the auxiliary spillwaybuilt in the 1980s, to be able to provide additional spillway capacity. this photo shows the seepage that was emanating from the downstream face of the dam during the event. and this was another major concern during that event because we never want to see dirty water coming out of a dam. that could indicate internal erosion. since that time, we have done some investigations. we don't think there was internal erosion in the sense a dam safety issue, we think the dirty water was from the reservoir. this is the upstream diversion dam that diverts creek flows around moccasin reservoir, an intake upstream of this structure that allows creek flows under normal operation to say bypass the reservoir and keep the hetch hetchy potable water isolated from the creek flows. in this event of course we had a major amount of debris come downstream and clog that diversion pipe and then the dam essentially overtopped and creek flows did go into the reservoir, which resulted in the emergency declaration.