This activity from Science Buddies shows you how to build a water clock using simple lab materials:

Three major parts make up the water clock that you will build: (first) an upper container from which water flows due to gravity; (second) a lower container that catches the water as it flows out of the upper container; and (third) a “float stick” made from a cork and a wood dowel that enables a person to track time visually. As the water flows from the upper container to the lower container, the float stick rises. The distance the stick rises is linked not only to the amount of water in the lower container, but also to how much time has passed; it indicates how much time has elapsed since the lower container was empty. As the engineer in charge of the project, your job will be to experiment and determine the best containers to use in order to create a water clock to track the passage of three hours of time. The Experimental Procedure below provides a general design to build the water clock, but you should feel free to use The Engineering Design Process to improve your own design and create a clock that appeals to you.

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