Other weirs:

        The size and complexity of a weir depends on the size of the watershed (i.e. the catchment area upstream of the weir) and therefore, the rate and intensity of the highest stream flows.  The highest flows only occur a few days out of a year, generally during the spring snowmelt.  However, it is very important to get an accurate flow rate during these high flow days in order to calculate an accurate annual water budget for each watershed.  Although the ideal situation would be to have a V-notch large enough to accommodate all flow rates from the stream, space is sometimes an issue and it is not possible to build a large enough ponding basin due to topography at the desired gauging location.  A more complex component, a modified San Dimas flume, was added to some of the weirs at Hubbard Brook where the ponding basin was not large enough, and the V-notch would have been over-topped during high flows.  Below are photos of each of the 9 weirs currently operating at Hubbard Brook.

W1

W2

W3

W4

 

W5

W6

W7

W8

W9

Web page created January 2001
by Thomas Siccama and Ellen Denny