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Message: [QUOTE="Meyer Jordan, post: 339238, member: 7131"] Referring back to the illustrations. There are basically two (2) types of pools associated with a stream or waterfall.....a 'scour' pool which is at the base of waterfalls and cascades and also following riffles is formed by the 'scouring' of the bottom by the force of the falling water in the former and the turbulent water in the latter. Pools are also formed at the outside of meander bends. No, I don't have any descriptive photos. All my photos were taken for selling purposes. But here are a couple of examples: [IMG]http://erccolorado.net/Images/Streams/Riffle_Pool.jpg[/IMG] [IMG]http://www.pennsylvaniawatersheds.org/wp-content/uploads/2007/12/scenic_stream.jpg[/IMG] At other times a pool is formed just by the general widening of the stream bed. The number and size of pools to be incorporated should be dictated first by the number of waterfall, cascades or ripples. Other pools can be added as available space permits. [/QUOTE]