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1. pUpValue: is the distance in metres from the bottom of the river to the top of the crest.
2. width: is the width if of the weir crest in metres. Note that there can only be one crest at a Flat V weir.
3. cSlope: is the slope of the "V" at the crest. The slope is the ratio of the horizontal distance over the vertical distance one metre (1m) expressed as a number.
4. sSlope: is the side slope of the weir. Most Flat V weirs don't have side slope. The slope is the ratio of the horizontal distance over the vertical distance one metre (1m) expressed as a number. There are two different calculation methods for Flat V weirs that are identified by either having the s-slope equal to 9999, or an actual value.

The figure below shows the relation between the input timeseries and coefficients, with an example for the cSlope value in case the slope of the weir is 15 degrees. Notice that headLevel and tailLevel are relative to the crestlevel (the point of the V).

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Output

1. discharge: discharge of the weir.

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