Linear Orifice Flow Meter Variable Description Table: in order of appearance in code

Variable Name

Variable Description

 
 $$ N_{Lfom} $$

Number of riser pipes

 
 $$ K_{Rm} $$

minor loss coefficient for rapid mix

 
 $$ A_{LfomOrificeTotal} $$

Combined area of all orifices

 
 $$ A_{Orifice} $$

function for determining the orifice areas as the vertical distance on the riser pipe increases

 
 $$ HL_{Lfom} $$

headloss through the Lfom, and the minimum height of the water in the entrance tank

 
 $$ Pi_{VenaContractaOrifice} $$

minor loss coefficient for an orifice (was K orifice)

 
 $$ Q_{Plant} $$

plant flow rate

 
 $$ ID_{Lfom} $$

the inner diameter of the riser pipe

 
 $$ Pi_{LfomOrificeArea} $$

ratio of LFOM pipe area to orifice area

 
 $$ ND_{Lfom} $$

nominal diameter of the riser pipe and rapid mix pipe

 
 $$ EN_{PipeSpec} $$

enumerated type of pipe

 
 $$ HL_{Rm} $$

rapid mix head loss

 
 $$ L_{RmPipe} $$

The total pipe length betweeen the bottom of the orifices and the flocculator

 
 $$ Nu_{Water} $$

viscosity of water through the plant

 
 $$ E_{Pvc} $$

PVC pipe roughness

 
 $$ H_{Ramp} $$

Function based off of ramp functions, this is an incremental function that all ows other funtions to evaluate one level of orifices at a time

 
 $$ B_{LfomOrifice} $$

vertical distance between orifices

 
 $$ Pi_{LfomH} $$

elevation between orifice rows at which the flow is calibrated, a 0 or 1 value. 0 corresponds to the current row and 1 corresponds to the next row

 
 $$ Q_{Ramp} $$

funtion to determine target riser pipe flow, incrementally calculates flows

 
 $$ Q_{LfomActual} $$

funtion to determine actual flow through orifices

 
 $$ n_{LfomOrifices} $$

number of orifices

 
 $$ D_{LfomOrifices} $$

diameter of Lfom orifices

 
 $$ D_{Circle} $$

function that determines the diamter of a circle given the area

 
 $$ D_{Drill} $$

function that determines the drill bit size necessary

 
 $$ N_{LfomOrificesFirstrow} $$

arbitrary value determines the number of orifices in the first row, currently 5 is selected

 
 $$ Q_{LfomError} $$

percent error in the actual flow rate compared to theoretical values

 
 $$ Q_{LfomErrorMax} $$

maximum error of Q_LfomError array

 
 $$ HL_{EtFloc} $$

headloss from the entrance tank to the flocculator

 
 $$ ZW_{Et} $$

water depth of entrance tank relative to the bottom of the sedimation tank

 
 $$ HW_{FlocStart} $$

height of the start of the floculation tank relative to the bottom of the sedimention tank

 
 $$ H_{LfomFreefall} $$

difference between height of water in floculation tank and the bottom set of orifices on the LFOM

 
 $$ HW_{Etmax} $$

maximum water level in entrance tank

 
 $$ HW_{Etmin} $$

minimum water level in entrance tank

 
 $$ H_{Et} $$

height of entrance tank walls

 
 $$ H_{PlantFreeBoard} $$

height of entrance tank above the top of the riser pipe

 
 $$ H_{LfomSF} $$

safety factor of height of riser pipe above top row of orifices

 
 $$ L_{Lfom} $$

height of the riser pipe