The bottom of the Daming Lake is composed of nonporous igneous stones which stops the spring water from infiltering into the ground.

• 泉水由南岸流入，水溢时便可从宋代修建于北岸的北水门流出，流入小清河，东注渤海，这种优良的疏通渠道是其他许多天然湖泊所不具备的。