Radial flow in a confined aquifer: Dupuit-Thiem

New channel Martin R. Hendriks: title sample judged 'pick' (Nearly all uploads are rigorous university-level hydrology lectures, but a few guitar lessons and travel/geology excursi); passed a second screen for sellers/exam-prep/re-uploads; 0 of 3 sampled transcripts showed teaching, 0 not; titles picked one by one, checked strictly; oEmbed verified.