EARTH458 Lecture Notes - Lecture 11: Snowmelt, Baseflow, Throughflow
17 Jul 2020
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Document Summary
Introduction to runoff and groundwater-surface water interactions lecture. Draw a diagram if it helps, or refer to the diagrams below. Baseflow: movement of water in the ground is slow. Delayed relative to the precipitation event in the stream. Regular and persists over long periods of time to allow streams to continue to flow. Decreases in dry periods as the water table lowers with depletion. Interflow: subsurface flow that does not recharge gw before entering the system. Precipitation that enters the shallow subsurface and moves laterally to the main stream channel without recharging the groundwater system. Occurs when a very permeable surface soil is underlain by a lower permeable unit. Moves along low permeability unit rather than infiltrating through it / Throughflow: (subsurface flow that returns to the surface before entering the stream) water infiltrates and then seeps out at the base of a slope without directly recharging ground water or entering a stream.
