Release Notes for EPANET 2.1

The last update to the EPANET engine was "Build 2.00.12" in February of 2008. Since that time, a community effort to update and extend the open-source code has emerged. This group has made a number of bug-fixes and API additions that help to improve the EPANET engine for everyone. Version 2.1 was released in July 2016, after 8.5 years.

Contributors to this version (listed in order of first contribution):

Lew Rossman
Michael Tryby
Feng Shang
James Uber
Tom Taxon
Sam Hatchett
Hyoungmin Woo
Jinduan Chen
Yunier Soad
Mike Kane
Demetrios Eliades
Will Furnass
Steffen Macke
Mariosmsk
Elad Salomons
Maurizio Cingi
Bryant McDonnell

##API Additions (new functions):

ENgetaveragepatternvalue
ENgetstatistic
ENgetcoord / ENsetcoord
ENgetpumptype
ENgetqualinfo

###Demands

ENgetnumdemands
ENgetbasedemand / ENsetbasedemand
ENgetdemandpattern

###Curves

ENgetcurve
ENgetcurveid
ENgetcurvelen
ENgetcurvevalue
ENsetcurvevalue
ENsetcurve
ENaddcurve
ENgetheadcurveindex
ENgetcurveindex

##API Extensions (additional parameters) ###node value types:

EN_TANKVOLUME
EN_MAXVOLUME

###link value types:

EN_LINKQUAL
EN_LINKPATTERN

###time parameters:

EN_STARTTIME
EN_HTIME
EN_QTIME
EN_HALTFLAG
EN_NEXTEVENT

###(new) statistic values:

EN_ITERATIONS
EN_RELATIVEERROR

###pump types

EN_CONST_HP
EN_POWER_FUNC
EN_CUSTOM

##Notable Performance Improvements, Bug Fixes, Usage Features, and other notes

API float type is a compile-time option with the EN_API_FLOAT_TYPE definition. Use either float or double - default if left undefined is float to maintain compatibility with 2.0.x
updated hash table algorithm
fixed memory leak when saving output
enables interleaved hydraulic and water quality analysis steps:

	ENopenH();
	ENopenQ();
	ENinitH(0);
	ENinitQ(EN_NOSAVE);
	do {
	  ENrunH(&t);
	  ENrunQ(&qt);
	  // collect results
	  ENnextH(&tstep);
	  ENnextQ(&qstep);
	} while (tstep > 0);
	ENcloseQ();
	ENcloseH();

engine code and command-line executable are now in separate implementation files
parameter #define directives are now enumerated values
main header now contains doxygen-compatible comment blocks for auto-generated documentation

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Release Notes for EPANET 2.1

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