**3.3 Cross sectional profile**

To prevent rainwater retention at the surface of the pavement the cross sectional profile of the road is seen to be cambered towards the drainage inverts on both sides of the road. This allows the road wash to flow towards the side line of the road.

### **3.4 Drain invert**

The drain inverts of the road are positioned along the drainage lines on both sides of the road to convey runoff from the road surfaces towards a sump or discharge basin, down slope. The drainage system could be an open channel or pipe drain depending upon environmental considerations. The conveyance of the drain will be designed based upon rainfall and catchment regimes.
