The Bible says Noah’s Flood began with 40 days and nights of rain, after those 40 another 110 until the Floodwater having covered the whole earth began to recede, thus the rainfall during the 40 days was by water blasted up into the atmosphere by the Fountains of the Deep which continued spewing lava and water for at least the remainder of the 150 days until the Floodwater began to recede. (For dynamics and geology see Page titled Natural Selection by Noah’s Flood and checkout GlobalFlood.org.)