To see how close California is to being drowned by its recent winter storms, just look to the small crowd of spectators and TV newscasters gathered yesterday on the northwest side of the state capital hoping to watch state water managers open the gates of the Sacramento Weir. The weir, something between a dam and a levee, lets dangerously high water spill over its top into a long, narrow, floodplain filled with rice paddies, grain fields, and other row crops.