Exact steady-state solution to air pumping from underground partly covered by an impermeable tarp

Profiling ponded soil surface in saturated seepage into drain-line sink: Kalashnikov’s method of lateral leaching revisited

“…seepage is impeded by the piezometric head inside the drain and collector tubes. Mityushev and Adler [38] studied the case of an empty circular drain placed between two semi-infinite Kalashnikov's channel rays (Figure 1(b)). This regime is the 'best' in terms of Vedernikov.…”