While Landing In The River, The Extended Landing Gear Contacted The Water And The Airplane Nosed Over, Resulting In Substantial Damage Analysis: The pilot of the amphibious airplane stated that he departed from a turf runway at his home airport but forgot to raise the landing gear. He planned a short flight to a nearby river where he would make a water landing, before returning to his home airport. While landing in the river, the extended landing gear contacted the water and the airplane nosed over, resulting in substantial damage to the forward portion of the fuselage.