EPANET/ReleaseNotes2_3.md

Release Notes for EPANET 2.3

This document describes the changes and updates that have been made in version 2.3 of EPANET.

• The check for at least two nodes, one tank/reservoir and no unconnected junction nodes was moved from EN_open to EN_openH and EN_openQ so that partial network data files can be opened by the toolkit.
• A EN_setcurvetype function was added to allow API clients to set a curve's type (e.g., EN_PUMP_CURVE, EN_VOLUME_CURVE, etc.).
• A EN_setvertex function was added to allow API clients to change the coordinates of a link's vertex.
• The index of a General Purpose Valve's (GPV's) head loss curve was added to the list of editable Link Properties using the symbolic constant name EN_GPV_CURVE.
• The EN_getlinkvalue and EN_setlinkvalue functions were updated to get and set the value of EN_GPV_CURVE.
• For EN_CUSTOM type pump curves the maximum head value is now extrapolated to the y-axis intercept instead of being based on the first curve data point. Similarly, the maximum flow value is extrapolated to the x-axis intercept.
• Status checking for a pump not able to deliver enough head has been replaced by adding a penalty term to the pump's operating curve that prevents it from having negative flow (i.e., from crossing the y-axis).
• Status checking for Flow Control Valves has been eliminated by using a continuous head v. flow function. If the current flow is below the valve setting then the normal open head loss relation is used; otherwise a linear penalty function is applied to any flow in excess of the setting. Warnings are no longer issued when the valve operates fully opened at flows below the setting.
• The maximum link head loss error convergence criterion is now evaluated using the most recently computed link flows instead of flows from the previous iteration.