Road Drain Raft/PCC/BBS/Shuttering/Curing in Full Detail at Site || By CivilGuruji

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Road Drain Raft/PCC/BBS/Shuttering/Curing in Full Detail at Site

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ABOUT THIS VIDEO :-
In this video Er. Fazal, Corporate Trainer of Civil Guruji (Civil Engineers Training Institute) is Explaining Road Drain Raft/PCC/BBS/Shuttering/Curing in Full Detail at Site

oad is equipped with a (proper) drainage system, the water along the roads will collect and be removed from the road body. This will protect the road surface, especially in case of dirt roads, and make the water available for productive use. Typically, the raison-d’être of road drainage systems is to preserve the roads and prevent runoff from interfering with road operations. However, at the same time they are large water-harvesting systems and should be managed accordingly. When not well designed and managed, road drainage commonly causes uncontrolled flooding and erosion that affects the road body, neighbouring land, and the environment. It is also a missed opportunity in terms of water harvesting for productive purposes.

The runoff is preferably “given back” to the land through water harvesting and the diversion of water to farmland, spread over rangeland, or used for forest development. This is to keep the hydrological connectivity of the road network (i.e., the connections between the roads and the streams in the watershed) from becoming very high and water being rapidly drained from the watersheds. This would cause amplified flood peaks and give water less time to infiltrate and for aquifers to be recharged. Rather than road drains connected to the streams in the watershed, it is better to have road drainage water run into vegetation bunds, farm fields, or pastures. This would also reduce sediment deposition in the streams.

As part of designing drainage systems, decisions on the number and location of culverts and other cross-drainage structures along a road body have an important effect on the opportunities to collect water, retain moisture, and control erosion and sedimentation. Cross-drainage structures are commonly placed in line with existing natural drainage paths such as gullies and small streams. They allow water from the upper catchment to pass underneath roads and connect directly to the downstream portion of the catchment. Because of cost, the number of cross-drainage structures is often minimized. These cross drains then commonly constitute bottlenecks, whereby naturally distributed runoff water is concentrated at a few points.

Culverts are important elements in road water management. They can be major sources of damage where they discharge water in an uncontrolled manner, but they can also guide the runoff from the catchment to places where it is used beneficially. Culverts, including their bed-sill and some of the ancillary structures, can also help control erosion.