release note

doc/ReleaseNotes/develop.tex

@@ -46,6 +46,7 @@
 		\item The Stress Package Concentration (SPC) utility available with the SSM Package is now the referred to as the Stress Package Component utility in the MF6IO guide.  Additionally, some relatively minor refactoring of the code facilitates use of the SPC utility with the GWE model type so that TEMPERATURE arrays may be read by the utility.  The SPC acronym was maintained to preserve backward compatibility.
 		\item The GWF-GWF Exchange has been fixed to support the configuration of the Mover package (MVR) also in cases where the number of exchanges equals zero (NEXG = 0). In earlier versions this has caused MODFLOW to terminate with an error.
 		\item A PRT bug was fixed in which array-based input read from the RCH (recharge) or EVT (evapotranspiration) packages could fail to be processed correctly by the PRT FMI (flow model interface) package, causing a crash.
+		\item PRT now allows more control over vertical particle motion in dry conditions (as well as fixing a related crash condition). In addition to the pre-existing DRAPE option, the PRP package now provides a DRY_TRACKING_METHOD option which configures how dry particles behave. This option accepts values DROP (default), STOP, and STAY. DROP indicates that dry particles should be dropped vertically until reaching the water table, if one exists below the particle. STOP indicates that dry particles should terminate. STAY indicates that dry particles should remain stationary but active. This option is highly relevant when the Newton formulation is used, since cells can be active but dry.
 
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