Description2. Photo 2 A more close-up view of how quickly surface water collects during a rain storm. Here 25 mm came in one hour with a peak intensity of 35mm/h. The photo shows an experimental plot prepared to show the difference between different types of cultural practices. The surface is here flat, but with old crop debris lying around to dampen some of the rain beating on the ground. Compare with photo 3. The crop is newly planted maize in rows. (20/3 1978)