FEASIBILITY OF PIPE AND THE BOX CULVERTS SUGGESTED BY IRC,SP -13

It was an occasion today on 11-10-2022 when the Gram Panchayat Balhsina Tehsil Jhandutta Distt Bilaspur Himachal Pradesh demanded feasibility of pipe and the slab culverts on the basis of design & Scope required for the rural road for which drawing based on the IRC ,SP 13 plate number 14 was suggested on the demand under public utilities and consideration of the economy required so for ,small culverts , in contrast with relatively larger structures across the defined channels, need not be designed normally to function with adequate clearance for passing the floating matter.The depth of culvert should be small and it does not matter if the opening stops appreciably below the formation level of the road .Indeed , it is correct to leave it in that position and let it function even with its inlet submerged .This makes it possible to design low abutments supporting an arc or a slab , or alternatively, to use the round pipes or the box culverts .As for as possible nor should high headwalls be provided for retaining deep overfills , instead , the length of the culverts should be increased suitably so that the road embankment,with its natural side slopes ,is accomodated without high retaining head walls .Where masonry abutments supporting arches or slabs are designed for culverts functioning under head , bed pavements must be provided .And, in all cases including pipe and box culverts , adequate provision must be made at the exit against erosion by designing the curtain walls .Where the exit is a free overfall , a suitable cistern and baffle wall must be added  for the dissipation of energy and stilling of the ensuring current. It is necessary to decide that a culvert has to be constructed on a road lying across some way must be proceed to calculate the discharge by using one of the run-off formulae , having due regard to the nature of the terrain and the intensity of rainfall described .