A Crump weir is a standard design weir for moderate flow rates.
Input
- headLevel: input water level. Can be equidistant or non-equidistantis the upstream level of water in the river measured from the top of the crest.
Coefficient set
- pUpValue: height of weir: : is the distance in metres from the bottom of the river, or crest, to the top of the crest.
- width: is the width of if the weir crest in metres.
- sSlope: : is the side slope of the weir. Crump weirs that have side slopes are uncommon, and if present only possible on one crest. The slope is the ratio of the horizontal distance over the vertical distance one metre (1m) expressed as a number.
- dischargeCoefficient: weir discharge coefficient (default is equal to sqrt(g)).
- energyHeadCorrection: if true energy head correction is taken into account (default is true).
Furthermore, one to three crests can be defined. The first crest is mandatory and only contains the relativeLevel attribute. The relativeLevels are the required head level adjustments for each crest of the weir. Each relativeLevel is subtracted from the headLevel to give a true indication of what the actual head level is over each crest. This is required as each crest at a particular weir may have different heights.
The second and third crests also must contain the width attribute. User has the choice between entering one of the following:
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Calculates discharge of a triangular profile or Crump weir according to the following formula. The flow calculations are done using measurements taken at the weir.
The following formula is used:
Parameters:
- P = height of weir or height of vertex above bottom
- b = width of weir opening of width of triangle
- h1 = upstream water level
- H1 = upstream energy level
- h2 = downstream energy level
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