Rating Curves in All the Right Places…

While plenty of rain has come down in Williamsburg over the past month, not enough rain has fallen on our farm to trigger flow in our stream.  As a result, we’re continuing to analyze samples from the last major flow event in April.  This is a good thing because the analysis of the April storm has turned out to be more complex than we initially anticipated.

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Yay New LIDAR!!

The end of last week came with a pleasant surprise of new 1.5m LIDAR being available for several counties in the Coastal Plain of Virginia. This meant I would be able to utilize the most current elevation data with the highest possible resolution. In my last post I explained how the 2m vs. 10m tests proved the 10m to be just as effective as the 2m and earlier this week I performed the same comparison using the new LIDAR. The results were very similar. A plot of the cumulative fraction drained along the field margin with both DEM resolutions showed the two to be matching exceptionally well. The higher resolution sets do allow for more accuracy in tracing the field margin, yet this doesn’t seem to cause a change in determining flow accumulation entering and exiting the field. This is great news! This allows me to analyze flow concentration on numerous fields as I am not restricted by the availability of high resolution data.

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