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  • Here the sudden base level drop triggered by the draining of Lake Agassiz down the Minnesota-Mississippi River system has triggered 11,000 years of knickpoint retreat and bank erosion that has been exacerbated by modern agricultural practices, such as tile drainage.

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  • A term from geomorphology and stream hydrology for a point of inflection in a stream's gradient. A knickpoint occurs as a steeper reach between two low-gradient reaches within a streambed, a waterfall being an extreme example. Knickpoints naturally migrate, illustrated by the slow upstream march of the famous Horseshoe Falls of the Niagara river.

    December 14, 2011