Therefore his height was exalted above all the trees of the field, and his boughs were multiplied, and his branches became long because of the multitude of waters, when he shot forth.
His branches became long, because of the multitude of waters, when he shot forth - because of the abundant moisture which nourished him in shooting forth-i.e, in whatever direction he shot forth. But see margin, 'when it (the deep - i:e., the Tigris) sent them (the multitude of waters) forth.'