might have issue with an ice sheet constant, testing now
#define RHOH2O 1000
#define SEDPHI (22.0*PI/180.0) //angle of internal friction (sediment)
#define SEDH 10 //depth of sediment layer (m)
-#define SEDD0 2.5e-14 //reference deformation rate for sediment (s^-1)
+#define SEDD0 7.9e-7 //reference deformation rate for sediment (s^-1)
#define SEDMU 3e9 //reference viscosity for sediment (Pa s)
#define RHOBROCK 3370
#define BROCKTIME 5000 //relaxation timescale for bedrock
