Diagrams about the water cycle that are geared to children are provided on KidZone Science and the USGS website. Each site offers an informative diagram as well as a detailed explanation of how the water cycle works.
The KidZone Science site provides a basic water cycle diagram that details the major processes of evaporation, condensation, precipitation and collection. This website offers a description of each part of the cycle and emphasizes the movement from one part of the cycle to the next. On USGS, a comprehensive diagram shows all of the aspects of the water cycle and how they interact, and includes descriptions of the different forms of water.