TRIVENIGANJ, India Stranded by hundreds of miles of floodwaters and trapped on rooftops and trees, desperate villagers stormed rescue boats yesterday as they tried to escape the flooding that tore through a riverbank and spilled over northern India's vast plains. Two weeks after the Kosi River overflowed its banks, Indian officials commandeered private watercraft after hearing that boat owners were charging people up to $150 each for a lifesaving ride - an impossibly large amount for those marooned in impoverished villages where many survive on a dollar a day. At a makeshift command post on a bridge outside Triveniganj, near the Nepal border, boats filled with survivors arrived every 10 or 15 minutes. Anything rescuers could scrounge was put to work - bright orange rubber dinghies, rickety wooden rowboats, canoes and shallow-bottomed army transports that appeared pulled straight from World War II. ...