ผู้นำเสนอ: Roland Bunch
กิจกรรม: ECHO East Africa Highlands Symposium 2014 (27-10-2014)
A-frame levels can be used to trace contour lines for soil conservation, or irrigation ditches at ½ % slope. They are highly accurate, and cost nothing.
ผู้นำเสนอ: Roland Bunch
กิจกรรม: ECHO East Africa Highlands Symposium 2014 (27-10-2014)
A-frame levels can be used to trace contour lines for soil conservation, or irrigation ditches at ½ % slope. They are highly accurate, and cost nothing.