diff --git a/src/funcs.h b/src/funcs.h
index e520b29..95aa66a 100755
--- a/src/funcs.h
+++ b/src/funcs.h
@@ -49,7 +49,7 @@ int     getcomment(Network *, int, int, char *);
 int     setcomment(Network *, int, int, const char *);
 
 int     namevalid(const char *);
-char    *getTmpName(char *);
+void    getTmpName(char *);
 char    *xstrcpy(char **, const char *, const size_t n);
 int     strcomp(const char *, const char *);
 double  interp(int, double [], double [], double);
diff --git a/src/hydcoeffs.c b/src/hydcoeffs.c
index 07da0dc..ffdf98c 100644
--- a/src/hydcoeffs.c
+++ b/src/hydcoeffs.c
@@ -505,20 +505,19 @@ void demandheadloss(Project *pr, int i, double dp, double n,
         *hloss = (*hgrad) * d;
     }
 
-    // Otherwise use power head loss function
-    else
+    // Use power head loss function for demand less than full
+    else if (r < 1.0)
     {
         *hgrad = n * dp * pow(r, n - 1.0) / dfull;
         *hloss = (*hgrad) * d / n;
-      
-        // Add on barrier function for any demand above full value
-        if (r >= 1.0)
-        {
-            *hgrad += CBIG;
-            *hloss += CBIG * (d - dfull);
-        }
     }
     
+    // Use upper barrier function for demand above full value
+    else
+    {
+        *hgrad = CBIG;
+        *hloss = dp + CBIG * (d - dfull);
+    }
 }
 
 
@@ -761,7 +760,8 @@ void  pumpcoeff(Project *pr, int k)
         if (n != 1.0)
         {
              // ... use linear approx. to pump curve for small flows
-            qa = pow(hyd->RQtol / n / r, 1.0 / (n - 1.0));
+            if (pump->Ptype == CONST_HP) qa = -CBIG;
+            else qa = pow(hyd->RQtol / n / r, 1.0 / (n - 1.0));
             if (q <= qa)
             {
                 hgrad = hyd->RQtol;
diff --git a/src/project.c b/src/project.c
index 07e7c54..76a863f 100644
--- a/src/project.c
+++ b/src/project.c
@@ -18,6 +18,8 @@
 //*** For the Windows SDK _tempnam function ***//
 #ifdef _WIN32
 #include <windows.h>
+//#else
+//#include <unistd.h >
 #endif
 
 #include "types.h"
@@ -1065,11 +1067,12 @@ int namevalid(const char *name)
     return TRUE;
 }
 
-char *getTmpName(char *fname)
+void getTmpName(char *fname)
 //----------------------------------------------------------------
 //  Input:   fname = file name string
-//  Output:  returns pointer to file name
-//  Purpose: creates a temporary file name with path prepended to it.
+//  Output:  an unused file name
+//  Purpose: creates a temporary file name with an "en" prefix
+//           or a blank name if an error occurs.
 //----------------------------------------------------------------
 {
 #ifdef _WIN32
@@ -1078,26 +1081,32 @@ char *getTmpName(char *fname)
 
     // --- use Windows _tempnam function to get a pointer to an
     //     unused file name that begins with "en"
+    strcpy(fname, "");
     name = _tempnam(NULL, "en");
-    if (name == NULL) return NULL;
-
-    // --- copy the file name to fname
-    if (strlen(name) < MAXFNAME) strncpy(fname, name, MAXFNAME);
-    else fname = NULL;
-
-    // --- free the pointer returned by _tempnam
-    if (name) free(name);
+    if (name)
+    {
+        // --- copy the file name to fname
+        if (strlen(name) < MAXFNAME) strncpy(fname, name, MAXFNAME);
 
+        // --- free the pointer returned by _tempnam
+        free(name);
+    }
     // --- for non-Windows systems:
 #else
     // --- use system function mkstemp() to create a temporary file name
+/*    
     int f = -1;
     strcpy(fname, "enXXXXXX");
     f = mkstemp(fname);
     close(f);
     remove(fname);
+*/
+    strcpy(fname, "enXXXXXX");
+    FILE *f = fdopen(mkstemp(fname), "r");
+    if (f == NULL) strcpy(fname, "");
+    else fclose(f);
+    remove(fname);
 #endif
-    return fname;
 }
 
 char *xstrcpy(char **s1, const char *s2, const size_t n)
@@ -1136,7 +1145,7 @@ char *xstrcpy(char **s1, const char *s2, const size_t n)
     if (n2 > n1) *s1 = realloc(*s1, (n2 + 1) * sizeof(char));
 
     // Copy the source string into the destination string
-    strcpy(*s1, s2);
+    strncpy(*s1, s2, n2+1);
     return *s1;
 }