Flat V weirs are used to calculate the flow of a river or stream. Predominantly, Flat V weirs are used where the flow rates are low and river sections quite narrow.
Input
- headLevel: is the upstream level of water in the river measured from the top of the crest at the bottom of the V.
- tailLevel: is the downstream level of water in the river measured from the top of the crest at the bottom of the V and can be positive or negative.
- type: type can be 'simple' or 'crest_tapping'. With 'crest_tapping' the pressure tapping measurements are taken and used for the flow calculation.
Coefficient set
- pUpValue: is the distance in metres from the bottom of the river to the top of the crest.
- width: is the width if the weir crest in metres. Note that there can only be one crest at a Flat V weir.
- 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.
- 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.
Output
- discharge: discharge of the weir.
Description
Calculates discharge of a flat v weir with backwater correction. The flow calculations are done using measurements taken at the weir.
