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Topic. II.9. Sewerage Facilities.Manholes and Street Inlets

Kinds of Sewerage Facilities

Facilities for the sewer network inspection, maintenance and operation Manholes Street inlets Overflows

Facilities for wastewater quantity and quality regulation Flow regulation chambers Retention basins Inception shafts Wastewater precipitation units

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Manholes

Manholes Positioning

On every horizontal and vertical turn of the sewer permanent way On the points of sewer pipes diameter or material change On the points of sewer branches joining to the receiving collectors On strait reaches in maximum distances - lmax, as follows:

At pipe diameters D < 200 mm lmax = 40 m

At pipe diameters D < 450 mm lmax = 60 m

At pipe diameters D < 600 mm lmax = 80 m

At pipe diameters D < 900 mm lmax = 100 m

At pipe diameters D < 1500 mm lmax = 150 m

At pipe diameters D > 1500 mm lmax = 200 m

Manholes kinds

Standard (prefabricated) manholes Individually designed and constructed manholes

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Manholes

Manholes Cunettes

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Manholes

Standard Prefabricated Reinforced Concrete Manhole

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Manholes

Individually Designed Reinforced Concrete Manholes

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Manholes

Reinforced Concrete Manhole

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Street Inlets

Street Inlets Kinds

At combined sewer system With catch basin (catch pot) Without catch basin

At separate sewer system (drainage network) Without catch basin

Street Inlets Positioning

At every sewer manhole On strait reaches

Maximal distance depending on the street width Maximal distance depending on the street slope

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Street Inlets

Street Inlets Positioning

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Street Inlets

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Street Inlets

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Street Inlets

Street Inlets with Catch Basin

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Street Inlets

Street Inlet without Catch Basin