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CONSTRUCTING A CANAL
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A-frame AGRODOKS Agromisa automatic level back reading base-line bench mark booklet bottom hair calculated carpenter level centre the bubble chapter clinometer collimation column compound levelling contour lines cross-hairs crossbar determine difference in height differences in elevation drainage dumpy level erosion example excavation field FIELD-SURVEYING fixed fore reading grid network grid point ground level hammer hand level helper horizontal distance hose irrigation lath level mark level tube level with board levelling instrument line of collimation line of sight measure distances measuring rod method middle hair moved necessary niveau pentagon prism perpendicular line plane table plumb bob position ranging poles right angle rope scale section 3.1 side slope sighting device soil shrinkage specific spirit level Staffholder staking out contours Step straight lines string touches surface area surveying tape measure telescope terrace model terrain terrasse tilting level tilting screw triangle tripod vertical distance Wageningen water-hose level width