Mystery of the Disappearing Streams

As some of you know, most of my life for the last two years has revolved around predicting the locations of small headwater streams that are not captured by the venerable National Hydrography Dataset. The NHD is a fantastic resource overall, but it does have its shortcomings, particularly in small, ephemeral channels. Usually, the limitations are fairly predictable, as they result from the intersection of limits of scale, subjective cartographic choices, and deliberate design rules that make a map good for one purpose but not necessarily others. Sometimes, those shortomings manifest themselves in unexpected ways.

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