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Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Scatter diagrams of annual OMR (m s−1) against NKL using the fan-sector method when the upstream distance is set to (a) 3, (b) 5, (c) 10, and (d) 15 km, with the red and blue lines denoting the fitted lines for all samples and samples of NLI greater than 10 only, respectively.