For three generations, Phillip Filter’s family has tended orchards that grow on a shelf of floodplain above the Feather River. Because the trees stand between the river and a major flood-protection levee, Filter’s family is no stranger to floods that sometimes spill over the river banks, inundate the orchards and then recede back into the channel below. But Filter has never seen damage to the riverbanks like what happened last week after the state suddenly shut down flows from Oroville Dam’s badly damaged spillway upstream.