a vertical dam holds back a flat-bottomed lake that is 85 deep throughout, including at the dam. if the lake is 1 km wide and 20 km long, how much stronger should the dam be than if the lake were smaller, only 1.0 km long? question 14 options: does not need to be any stronger. pressure depends on water depth, not volume. approximately 20 times stronger. approximately 202 times stronger appromately four times stronger.