FIG. 8. A conceptual wireless mesh network or "multihop" system in a watershed. The sensors can all communicate to determine the most efficient wireless data transfer path to the gateway from where the data is transferred to the computer. The remote sensor sends data to a relay node, which passes it on to the gateway. Also shown are examples of the scale triplet (Blöschl and Sivapalan, 1995): support (Supp), spacing, and extent.