CAMBER OR CANT IS THE CROSS SLOPE PROVIDED TO RAISE THE MIDDLE OF THE ROAD SURFACE IN THE TRANSVERSE DIRECTION TO DRAIN OF RAINWATER FROM THE ROAD SURFACE.
THE OBJECTIVES OF PROVIDING CAMBER ARE:
SURFACE PROTECTION ESPECIALLY FOR GRAVEL AND BITUMINOUS ROADS
PREVENT ENTRY OF WATER INTO BITUMINOUS PAVEMENT LAYERS.
QUICK DRYING OF PAVEMENT WHICH IN TURN INCREASES SAFETY
TYPES OF CAMBER
CAMBER
PAVEMENT CAMBER OR CROSSFALL
Cement concrete 1.7-2.0 % (1 in 60 to 1 in 50)
Thin bit surfacing 2.0-2.5 % (1in50 to 1in40)
Water bound 2.5-3.0 %(1 in 40 to 1 in 33)
macadam, gravel
Earthen 3.0-4.0 % (1 in 33 to 1 in 25)
CALCULATION
2% = 6mx2/1000 =120mm
1 : 50=1/50 x1000 =20mm =20x6 =120mm(for 6m)