Journal
WATER RESOURCES RESEARCH
Volume 57, Issue 5, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2020WR027514
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Descriptions of runoff processes have become more detailed in recent years, but there has been little grouping of these facts. The fill-and-spill concept provides a structured way to group event-based runoff generation processes, where water is stored until a critical level is reached and an outflow pathway is activated.
Descriptions of runoff generation processes continue to grow, helping to reveal complexities and hydrologic behavior across a wide range of environments and scales. But to date, there has been little grouping of these process facts. Here, we discuss how the fill-and-spill concept can provide a framework to group event-based runoff generation processes. The fill-and-spill concept describes where vertical and lateral additions of water to a landscape unit are placed into storage (the fill)-and only when this storage reaches a critical level (the spill), and other storages are filled and become connected, does a previously infeasible (but subsequently important) outflow pathway become activated. We show that fill-and-spill can be observed at a range of scales and propose that future fieldwork should first define the scale of interest and then evaluate what is filling-and-spilling at that scale. Such an approach may be helpful for those instrumenting and modeling new hillslopes or catchments because it provides a structured way to develop perceptual models for runoff generation and to group behaviors at different sites and scales.
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