diff --git a/HSPEXP/HSPEXP31_Manual.pdf b/HSPEXP/HSPEXP31_Manual.pdf
new file mode 100644
index 000000000..427c26fb7
Binary files /dev/null and b/HSPEXP/HSPEXP31_Manual.pdf differ
diff --git a/HSPEXP/HSPFOutputReports.vb b/HSPEXP/HSPFOutputReports.vb
index c23a55e47..fc517433b 100644
--- a/HSPEXP/HSPFOutputReports.vb
+++ b/HSPEXP/HSPFOutputReports.vb
@@ -1143,7 +1143,7 @@ Module HSPFOutputReports
         GeneralModelInfoText.AppendLine("  </tr>")
         GeneralModelInfoText.AppendLine("  <tr>")
         GeneralModelInfoText.AppendLine("    <td>HSPEXP+ Version </td>")
-        GeneralModelInfoText.AppendLine("    <td align=center>3.0 beta</td>")
+        GeneralModelInfoText.AppendLine("    <td align=center>3.1</td>")
         GeneralModelInfoText.AppendLine("  </tr>")
         GeneralModelInfoText.AppendLine("  <tr>")
         GeneralModelInfoText.AppendLine("    <td>Sections listed in this report</td>")
diff --git a/HSPEXP/My Project/AssemblyInfo.vb b/HSPEXP/My Project/AssemblyInfo.vb
index 3598d2466..be7ae40bb 100644
--- a/HSPEXP/My Project/AssemblyInfo.vb	
+++ b/HSPEXP/My Project/AssemblyInfo.vb	
@@ -1,37 +1,37 @@
-Imports System.Resources
-Imports System
-Imports System.Reflection
-Imports System.Runtime.InteropServices
-
-' General Information about an assembly is controlled through the following 
-' set of attributes. Change these attribute values to modify the information
-' associated with an assembly.
-
-' Review the values of the assembly attributes
-
-<Assembly: AssemblyTitle("HSPEXP+")>
-<Assembly: AssemblyDescription("Hydrology & Water Quality Calibration Tool")>
-<Assembly: AssemblyCompany("RESPEC")>
-<Assembly: AssemblyProduct("HSPEXP")>
-<Assembly: AssemblyCopyright("")>
-<Assembly: AssemblyTrademark("")>
-
-<Assembly: ComVisible(False)>
-
-'The following GUID is for the ID of the typelib if this project is exposed to COM
-<Assembly: Guid("c441ee13-d195-4604-b625-49b5a0ad455a")>
-
-' Version information for an assembly consists of the following four values:
-'
-'      Major Version
-'      Minor Version 
-'      Build Number
-'      Revision
-'
-' You can specify all the values or you can default the Build and Revision Numbers 
-' by using the '*' as shown below:
-' <Assembly: AssemblyVersion("1.0.*")> 
-
-<Assembly: AssemblyVersion("3.00.0.0")>
-<Assembly: AssemblyFileVersion("3.00.0.0")>
-<Assembly: NeutralResourcesLanguage("en-US")>
+Imports System.Resources
+Imports System
+Imports System.Reflection
+Imports System.Runtime.InteropServices
+
+' General Information about an assembly is controlled through the following 
+' set of attributes. Change these attribute values to modify the information
+' associated with an assembly.
+
+' Review the values of the assembly attributes
+
+<Assembly: AssemblyTitle("HSPEXP+")>
+<Assembly: AssemblyDescription("Hydrology & Water Quality Calibration Tool")>
+<Assembly: AssemblyCompany("RESPEC")>
+<Assembly: AssemblyProduct("HSPEXP")>
+<Assembly: AssemblyCopyright("")>
+<Assembly: AssemblyTrademark("")>
+
+<Assembly: ComVisible(False)>
+
+'The following GUID is for the ID of the typelib if this project is exposed to COM
+<Assembly: Guid("c441ee13-d195-4604-b625-49b5a0ad455a")>
+
+' Version information for an assembly consists of the following four values:
+'
+'      Major Version
+'      Minor Version 
+'      Build Number
+'      Revision
+'
+' You can specify all the values or you can default the Build and Revision Numbers 
+' by using the '*' as shown below:
+' <Assembly: AssemblyVersion("1.0.*")> 
+
+<Assembly: AssemblyVersion("3.1.0.0")>
+<Assembly: AssemblyFileVersion("3.1.0.0")>
+<Assembly: NeutralResourcesLanguage("en-US")>
diff --git a/HSPEXP/SetUpScript.iss b/HSPEXP/SetUpScript.iss
index d96991a4a..b8b877d56 100644
--- a/HSPEXP/SetUpScript.iss
+++ b/HSPEXP/SetUpScript.iss
@@ -2,7 +2,7 @@
 ; SEE THE DOCUMENTATION FOR DETAILS ON CREATING INNO SETUP SCRIPT FILES!
 
 #define MyAppName "HSPEXP+"
-#define MyAppVersion "3.00"
+#define MyAppVersion "3.1"
 #define MyAppPublisher "RESPEC"
 #define MyAppURL "http://www.respec.com/product/hspexp/"
 #define MyAppExeName "HSPEXP+.exe"
@@ -23,7 +23,7 @@ AppContact= {#MyAppURL}
 VersionInfoCopyright=Mozilla Public License (MPL) 1.1
 DefaultDirName={reg:HKLM\SOFTWARE\RESPEC\BASINS45,Base Directory|{pf}\HSPEXP+}
 DefaultGroupName={#MyAppName}
-OutputBaseFilename=HSPEXP+3.0SetUp
+OutputBaseFilename=HSPEXP+3.1SetUp
 Compression=lzma
 SolidCompression=yes
 InfoBeforeFile=install.txt
diff --git a/HSPEXP/install.txt b/HSPEXP/install.txt
index 76c9d9eaf..ba6f1dd9c 100644
--- a/HSPEXP/install.txt
+++ b/HSPEXP/install.txt
@@ -1,10 +1,20 @@
-Date: 7/19/2019
+Date: 11/5/2019
+
+HSPEXP+3.1
+
+New Features:
+1. New option to support SNOW calibration. See HSPEXP+ documentation.
+2. Complete documentation of all constituent balance reports in Appendix A.
+
+
+Date: 10/15/2019
 
 HSPEXP+3.0 
 
 New Features:
 1. Added Model QA/QC report. See HSPEXP+ documentation.
 2. Added instream model setup for BATHTUB and WASP.  See HSPEXP+ documentation.
+3. Automated graphs for sparse data scatter plots and frequency graphs now use only paired data points.
 
 Bugs Fixed:
 1. The expert statistic calculated the years of simulation as an integer. This skewed calculations for models with very small model span. That has been fixed.
@@ -15,6 +25,7 @@ Bugs Fixed:
 6. Regan plots and Diurnal QA reports now use 'subset by date' 
 7. Better curve labeling on storm plots with non-daily data
 
+
 Date: 06/15/2018
 
 HSPEXP+2.0 is a major upgrade to HSPEXP+1.32. The following list of features added and bugs fixed for the version 2.0 includes all added features and fixed bugs in the earlier beta versions. The installer is now signed and it tells the users that the installer has been produced by RESPEC. This will reduce the security warnings.