Ever wonder how rivers shape mountains? How to classify stream erosion? Wildland Hydrology Consultants, a firm based in Pagosa Springs, Colo., offers courses from spring through fall in Applied Fluvial Geomorphology, Stream Classification and Applications and River Assessment and Monitoring. The five-day courses for hydrologists, fisheries biologists, and other riparian ecosystem specialists cover urban, agricultural and "wildland" watersheds. Teachers include Wildland's Dave Rosgen, famous for his river restoration work, and Luna Leopold, son of pioneering ecologist Aldo Leopold. The setting is the San Juan Mountains outside the town of Pagosa Springs, where life zones range from the semi-arid desert to the alpine. Cost of the courses is $1,150 and includes lodging, meals and materials. For more information, contact Wildland Hydrology, 1 Stevens Lake Road, Pagosa Springs, CO 81147 (970/731-4424).