Fig. 4. Back pressures calculated using analytical [1,2] and numerical [4,5] solutions as a function of the final discharge rate Q under steady state conditions for two soils (Magal clay loam and Arava sandy loam), the source radius r₀ of 0.01 m, the inlet pressure P_in of 10 m, and the nominal discharge rates Q₀ of 2, 4, and 8 L h^–1.