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"Strahler stream order" means the hierarchical ordering of streams based on the degree of branching which is used in an assessment of water quality treatment requirements. A first-order stream is an unforked or unbranched stream. Two first-order streams flow together to form a second-order stream and two second-order streams combine to make a third-order stream, etc. This ordering method starts at zero at each terminal segment, and proceeds towards the root stream. Each time a bifurcation node is encountered, if both daughter branches have the same order, then the order is increased by one, otherwise the largest order is used. (Added by Amended Ord. 10-026, June 9, 2010, Eff date Sept. 30, 2010).