A new solution for water storage to a fixed depth for constant flux infiltration

A quantitative description of water infiltration under constant flux bounda ry renditions is useful for predicting water flow and chemical transport pr ocesses occurring in surface soils. A new quasi-analytical solution for wat er storage to a fixed depth for constant flux infiltration is presented. Th e solution, based on the flux-concentration relationship, allows general fo rms of soil hydraulic functions to be used and provides a direct interpreta tion of measurements from vertically installed time domain reflectometry pr obes. To evaluate the solution, a constant flux infiltration experiment was conducted and the hydraulic parameters for the experimental site were dete rmined independently. The solution predictions using the approximate flux-c oncentration relationship for linear soils were essentially identical to an existing analytical solution using the Broadbridge and White form of hydra ulic functions and to the measurements.