Fig. 3. Depth to weathered rock and soil water content in two zero-order watersheds. These examples are from the Grass 3 and Chaparral 2 watersheds. Both soil characteristics are shown as a 3-m grid, overlain by a topographic map of each watershed; points indicate measurement locations. In the six zero-order watersheds examined, depth to weathered rock generally is thickest at the summit and thins toward the outlet of the watershed. In all watersheds, soil water content reflects depth to weathered rock; however, this relation is strongest in grass watersheds.