Borehole Drilling Supervision Course, Zambia, 2018 - Skat Foundation, UNICEF & Zambia Government
5:39
Quatre étapes pour de meilleurs contrats de forage
31:06
Borehole Drilling Process
11:24
How you can drilling water in dry areas in Zambia
5:15
Why are some boreholes better than others?
1:01:47
Member organisation event: Siting and maintaining Solar powered water systems SPWS
4:34
The Borehole Drilling Process - A Beginner's Guide with Nakiso Borehole Drilling!
22:55
Borehole drilling and pump installation EP 8
16:04