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Heavy water (deuterium oxide (2H 2O) or D 2O) is a form of water that contains a larger than normal amount of the hydrogen isotope deuterium (2H or D, also known as heavy hydrogen), rather than the common hydrogen-1 isotope (1H or H, also called protium) that makes up most of the hydrogen in regular water.
Heavy rainfall can be depicted on maps that show curves of equal rainfall. Such curves are called isohyets, and the resulting maps are called isohyetal maps. Lag Time - The time difference between when heavy precipitation occurs and when peak discharge occurs in the streams draining an area is called lag time.