The principal scheme and construction details of electrical analog circuit are described for modeling the hydrologic behavior of watersheds. The model employs passive electronic elements that modify an electrical input function in a manner markedly similar to the way rainfall input is modified by hydrologic parameters as it traverses through a watershed. It provides an excellent teaching and research tool for studying the major hydrologic processes of a watershed and their interrelationships. It is particularly suitable as a visual aid for familiarizing students with watershed behavior and can be used by researchers for developing functional relationships of hydrologic processes from electrical theory. (Author)