This view is looking into the culvert with the water coming towards you.
This diagram shows a simple V notch weir that could easily be fabricated from plywood and inserted into a concrete or corrugated culvert to allow the water flow to be measured. The plywood is roughly a semicircle with a 90° V notch cut into it:
This
view is looking into the culvert with the water coming towards you.
This diagram is very similar to fig 5 on page 3 of the Dept of Ecology paper on open channel flow measurement:
http://www.ecy.wa.gov/programs/wr/measuring/images/pdf/openchannelsystems.pdf
Details of the Rosario Cascade Creek diversion and details of the V notch weir calculations.
Sandy Taylor
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