rhof 1000[kg/m^3] "Freshwater density" rhos 1025[kg/m^3] "Saltwater density" Mn 58.44[g/mol] "Molar mass of salt" cs 35[g/l]/Mn "Saltwater concentration" por 0.35 Porosity theta_M 0.09 "Volume fraction of Macropores" D 1.886e-5[m^2/s] "Diffusion coefficient" Kmean_h 2.6E-4[m/s] "Average horizontal hydraulic conductivity" Kmean_v 1.05E-4[m/s] "Average vertical hydraulic conductivity" Kl 0.1[m/s] "Hydraulic conductivity of lava tubes" q_in 1.2[m/d] "Freshwater recharge" Mwell 5e-4[m^3/s] "Well pumping rate"