double getVariableValue(int varCode)
//
// Input: varCode = code number of process variable or pollutant
// Output: returns current value of variable
// Purpose: finds current value of a process variable or pollutant concen.,
// making reference to the node being evaluated which is stored in
// shared variable J.
//
{
int p;
double a1, a2, y;
// --- variable is a process variable
if ( varCode < PVMAX )
{
switch ( varCode )
{
case pvHRT: // HRT in hours
if ( Node[J].type == STORAGE )
{
return Storage[Node[J].subIndex].hrt / 3600.0;
}
else return 0.0;
case pvDT:
return Dt; // time step in seconds
case pvFLOW:
return Q * UCF(FLOW); // flow in user's units
case pvDEPTH:
y = (Node[J].oldDepth + Node[J].newDepth) / 2.0;
return y * UCF(LENGTH); // depth in ft or m
case pvAREA:
a1 = node_getSurfArea(J, Node[J].oldDepth);
a2 = node_getSurfArea(J, Node[J].newDepth);
return (a1 + a2) / 2.0 * UCF(LENGTH) * UCF(LENGTH);
default:
return 0.0;
}
}
// --- variable is a pollutant concentration
else if ( varCode < PVMAX + Nobjects[POLLUT] )
{
p = varCode - PVMAX;
if ( Treatment->treatType == REMOVAL ) return Cin[p];
return Node[J].newQual[p];
}
// --- variable is a pollutant removal
else
{
p = varCode - PVMAX - Nobjects[POLLUT];
if ( p >= Nobjects[POLLUT] ) return 0.0;
return getRemoval(p);
}
}
double node_getPondedArea(int j, double d)
//
// Input: j = node index
// d = water depth (ft)
// Output: returns surface area of water at a node (ft2)
// Purpose: computes surface area of water at a node based on depth.
//
{
double a;
// --- use regular getSurfArea function if node not flooded
if ( d <= Node[j].fullDepth || Node[j].pondedArea == 0.0 )
{
return node_getSurfArea(j, d);
}
// --- compute ponded depth
d = d - Node[j].fullDepth;
// --- use ponded area for flooded node
a = Node[j].pondedArea;
if ( a <= 0.0 ) a = node_getSurfArea(j, Node[j].fullDepth);
return a;
}
void initNodeStates()
//
// Input: none
// Output: none
// Purpose: initializes node's surface area, inflow & outflow
//
{
int i;
for (i = 0; i < Nobjects[NODE]; i++)
{
// --- initialize nodal surface area
if ( AllowPonding )
{
Xnode[i].newSurfArea = node_getPondedArea(i, Node[i].newDepth);
}
else
{
Xnode[i].newSurfArea = node_getSurfArea(i, Node[i].newDepth);
}
if ( Xnode[i].newSurfArea < MinSurfArea )
{
Xnode[i].newSurfArea = MinSurfArea;
}
//// Following code section modified for release 5.1.007 //// //(5.1.007)
// --- initialize nodal inflow & outflow
Node[i].inflow = 0.0;
Node[i].outflow = Node[i].losses;
if ( Node[i].newLatFlow >= 0.0 )
{
Node[i].inflow += Node[i].newLatFlow;
}
else
{
Node[i].outflow -= Node[i].newLatFlow;
}
Xnode[i].sumdqdh = 0.0;
}
}
