Fix for FCV problem

This update prevents a solution where the computed loss coefficient for a FCV at its flow setting would be less than the user supplied fully opened coefficient.

ReleaseNotes2_3.md

@@ -22,6 +22,8 @@ This document describes the changes and updates that have been made in version 2
    - changing the absolute tolerance used to compare the closeness of test results to benchmark values from 0 to 0.0001
    - dropping the "correct decimal digits" test 
    - dropping the check for identical status report content since it prevents accepting code changes that produce more accurate solutions in fewer iterations.
+ - A possible loss of network connectivity when evaluating a Pressure Sustaining Valve was prevented.
+ - Having the implied loss coefficient for an active Flow Control Valve be less than its fully opened value was prevented.
  
  
 

src/hydstatus.c

@@ -7,7 +7,7 @@ Description:  updates hydraulic status of network elements
 Authors:      see AUTHORS
 Copyright:    see AUTHORS
 License:      see LICENSE
-Last Updated: 05/15/2019
+Last Updated: 08/08/2022
 ******************************************************************************
 */
 
@@ -394,6 +394,15 @@ StatusType  fcvstatus(Project *pr, int k, StatusType s, double h1, double h2)
     {
         status = ACTIVE;
     }
+
+    // Active valve's loss coeff. can't be < fully open loss coeff.
+    else if (status == ACTIVE)
+    {
+        if ((h1 - h2) / SQR(hyd->LinkFlow[k] < pr->network.Link[k].Km)
+        {
+            status = XFCV;
+        }
+    }        
     return status;
 }