19:32

Contouring a water table, Part 1

14:12

Contour Map / Topographic Map Reading

17:46

Mapping Water Tables

15:54

Water Table

14:30

les eaux souterraines: circulation de l'eau dans les nappes

19:17

contouring hydraulic heads in cross section

56:38

TP carte piézométrique

22:16

Water pump without electricity that can pump water up to the hills