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ROADWITHOUT DRAIN

A GREAT DISASTER-

A case Study

By

Er. Nandanandan Das

Ex. E.I.C cum Secretary, Works,

Govt. Of Odisha

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The good road net work system is the symbol of development of the

country. Good road creates easy transportation. Even if the road is

improved and made good motor able condition, can be damaged due

to inadequate provision of drainage system. .

The provision of drains use:-

To carry storm water, waste water.

Act as cut off, which protect to entry of outside ground water to inside

of road.

V-Type line (Fig-I) drains act as prevention of accidents while passing

through villages and towns.

Typical Section of V-Type Lined Drain

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The drainage layer is provided to release the water inside the road to outside

but when the same was blocked, the function of drainage of water from inside

of road to outside was stopped. Rather outside water easily entered to drainag

layer making up ward pressure from bottom of GSB & WMM layer to top

during monsoon.

This created deterioration of surface of road due to vertical water pressure from

bottom and by running of traffic on top. The formation of the road was with 7m

carriage way. The typical cross section of road has been given in (Fig. -II).

Crosses Section details - thickness of G.S.B. - 275mm. W.M.M. -250mm, D.B.M

-100mm, B.C -40mm total 665 mm i.e. 0.665m. The depth of drain should b

665mm + depth of storm water flow in the drain i.e. about 400mm below G.S.B

layer. So total depth was 1065mm. i.e. 1.065m. Slope of road was 1:2, so th

horizon coverage was 2.13m. Total effective length from centre of road wa

6+2.13 m. I.e. 8.13m.

Fig-IITypical Cross Section of Sambalpur Rourkela (SH-10)

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Since earth work was completed on almost entire stretch of road and paymen

on earth work item was released, subsequent bill was held up for rectificatio

of defects and trimming the slope of embankment and providing V-typearthen drain where ever necessary (See Fig.III).

Contractor was unwilling to attend such defect, as the length of road was mor

than 100 km and complained that this would have been pointed out from th

starting of the work.

Fig-III

1M

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When the contractor understood that the maintenance for the road for one yea

was to be made at their cost and the road will be damaged gradually, if the ove

burden earth were not removed.

Contractor was given option to move J.C.B on both side of road at a distance 8.5m from the centre of the road for a depth of 1.m from the formation leve

with 0.75m width, which was suitable.

The option was accepted. The contractor could complete making drain on bot

side for a length 110 km from Jharsuguda to Rourkela covering two package

since Author was in charge of those two packages. The road was saved from

further deterioration. Vide Fig-IV

Fig-IV

Always Engineers should derive the solution on problem as per the si

condition for arriving qualitative and quantitative work.

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THE END

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