This program follows the route taken by rainwater through a number of different catchments and evaluates the response of these catchments to a rainfall event—a response represented by the flood hydrograph. The program was photographed in the Santa Clara valley in southern California and in Wales. It emphasizes the tools and techniques necessary for a catchment study and subsequently compares the effect of vegetation on the discharge of two rivers by using the measurement techniques taught in the program. (20 minutes)

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Part of the Series : Geology: A Search for Order

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		Soils: Profiles and Processes This program looks at the way soils can vary even within a small area of a forest. A well-developed podzol is examined in detail, with samples taken from the center of each horizon and then analyzed for organic content, soil acidity, mineral content,...(more details)		DVD $19.95 DVD + 3-Year Streaming $29.93 3-Year Streaming $19.95
		River Channel Forms This program analyzes the dynamic nature of rivers and the relationship between their forms and processes. It examines the various functions a single river needs to perform, and shows how to measure river form and process, relate the two, and synthes...(more details)		DVD $19.95 DVD + 3-Year Streaming $29.93 3-Year Streaming $19.95
		Flood Control The lowland basis around Los Angeles contains the most extensive water conservation and flood control system in the world. In 1917, work began on a system of dams and improved channels to control the floodwaters entering the basin. This program looks...(more details)		DVD $19.95 DVD + 3-Year Streaming $29.93 3-Year Streaming $19.95
		Coastal Dunes At ground level, shallow seas, broad beaches, dunes, and waterlogged hollows seem to comprise a chaotic environment. In fact, there is order and form, produced by the interaction of wind, vegetation, and moving sand. Because sand dunes develop rapidl...(more details)		DVD $19.95 DVD + 3-Year Streaming $29.93 3-Year Streaming $19.95
		Glacial Deposits Sediment sequences deposited under glacial conditions during the Pleistocene period cover some 10% of the earth's land surface. This program concentrates on the interpretation of a sediment sequence exposed in a river cliff cut by the River Severn in...(more details)		DVD $19.95 DVD + 3-Year Streaming $29.93 3-Year Streaming $19.95

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