Size
45 cm x 60 cm (18” x 24”) or 45 cm x 90 cm (18” x 36”), depending upon the number of pipe connections entering the chamber, for two pipe connections use one chamber of 45 cm x 90 cm size inspection chamber.
Location
As per the drawing on the proposed alignment.
Wall thickness
23 cm (9”) of burnt bricks.
Inside plaster
Smooth finished with extra cement in C.M. 1:4.
External plaster
Sand faced plaster in C.M. 1:4.
Gully/channel
P.C.C. of grade M10. Finished smooth with cement.
Frame and Cover
Frame to be fixed in 10cm (4”) thick P.C.C. of grade M10, before internal and external plaster.
Precast concrete covers for the chamber in the parking should be designed for vehicular loading.
Bottom level
15 mm(1/2) below the incoming flow and flushed to the outgoing flow.
Top of chamber
Same as the parking floor level/road level.
Spacing of manholes/chambers (inspection chambers)
Dia. Of sewer line
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Spacing on straight line
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Dia. Up to 300 mm
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Maximum 55 m
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Dia. 301 to 500 mm
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Maximum 75 m
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Dia. 901 to 900 mm
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Maximum 90 m
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Dia. Beyond 900 mm
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Maximum any interval as approved by authority
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