Add EN_PRESS_UNITS to EN_getoption & EN_setoption

include/epanet2_enums.h

@@ -291,6 +291,19 @@ typedef enum {
   EN_CMS         = 10   //!< Cubic meters per second
 } EN_FlowUnits;
 
+/// Pressure units
+/**
+The available choices for pressure units for the \b EN_PRESS_UNITS option in @ref EN_getoption
+and @ref EN_setoption. For networks using US Customary units for flow ( \b EN_CFS through
+\b EN_AFD ) pressure units can only be set as PSI. For network using metric units, you can
+select either \b EN_MTR or \b EN_KPA.
+*/
+typedef enum {
+  EN_PSI          = 0,   //!< Pounds per square inch
+  EN_KPA          = 1,    //!< Kilopascals
+  EN_METERS       = 2   //!< Meters
+} EN_PressUnits;
+
 /// Demand models
 /**
 These choices for modeling consumer demands are used with @ref EN_getdemandmodel
@@ -337,7 +350,8 @@ typedef enum {
   EN_TANKORDER      = 21, //!< Bulk water reaction order for tanks
   EN_CONCENLIMIT    = 22, //!< Limiting concentration for growth reactions
   EN_DEMANDPATTERN  = 23, //!< Name of default demand pattern
-  EN_EMITBACKFLOW   = 24  //!< 1 if emitters can backflow, 0 if not
+  EN_EMITBACKFLOW   = 24, //!< 1 if emitters can backflow, 0 if not
+  EN_PRESS_UNITS    = 25  //!< Pressure units (see @ref EN_PressUnits)
 } EN_Option;
 
 /// Simple control types