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In this presentation, we use tree rings (continuous and discontinuous series) to reconstruct past spring floods in cold environments. Spring floods are short duration events that may not be visible in classical tree ring indicators such as ring widths. Ice scars are conspicuous evidences of past spring floods and can greatly augment the reconstruction’s reliability, but pose a certain number of statistical problems when they are used as proxies. Some of these problems are described and solved here, using a novel reconstruction procedure.