Recommended locations for placement of different grade and types/shapes of manhole covers and frames are as under :-
LD-2.5 Rectangular, Square or Circular Solid Types Suitable for use within residential and institutional complexes/areas with pedestrian but occasional Light Motor Vehicle traffic. These covers are also used for ‘Inspection Chambers’
MD-10 Circular or Rectangular Types Suitable for use in service lanes/roads, on pavements for use under medium-duty vehicular traffic including for car parking areas.
HD-20 Circular, Square or Rectangular ( Scrapper Manhole ) Types Suitable for use in institutional/commercial areas, carriageways/city trunk roads/bus terminals, with heavy-duty vehicular traffic of wheel loads between 5 to 10 tonnes, like buses, trucks and parking areas and where the manhole chambers are located in-between the pavement and the middle of the road.
EHD-35 Circular, Square or Rectangular ( Scrapper Manhole ) Types Suitable for use on carriageways in commercial/industrial/port areas/near warehouses/godowns/where frequent loading and unloading of trucks/trailers are common, With slow to fast moving vehicular traffic of the types having wheel loads up to 11.5 tonnes irrespective of the location of the manhole chambers.
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