process	xWat	xSed	sWat	sSed
flow	(xInf(time)-xWat)	NA	(sInf(time)-sWat)	NA
sett	-1/zWat	1/zSed	NA	NA
diff	NA	NA	1/zWat	-1/zSed/por
degrWat	-1	NA	s_x	NA
degrSed	NA	-1	NA	s_x/por
