1 II. Sewer Networks and Facilities Topic. II. 12. Detention (Retention) Basins: Kinds and Structures. Sewerage Pumping Stations Detention Basins: Kinds I. According to their technological function For first flush detention For hydraulic relief of the sewer network For wet weather regulation of inflow to the WWTP II. According to their position in respect to the sewer main On the line of the sewer mains Of line the sewer mains III. According to their structures Open air detention basins Underground (covered) detention basins
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1 II. Sewer Networks and Facilities Topic. II. 12. Detention (Retention) Basins: Kinds and Structures. Sewerage Pumping Stations Detention Basins: Kinds.
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II. Sewer Networks and FacilitiesTopic. II. 12. Detention (Retention) Basins: Kinds
and Structures. Sewerage Pumping Stations
Detention Basins: Kinds
I. According to their technological function For first flush detention For hydraulic relief of the sewer network For wet weather regulation of inflow to the WWTP
II. According to their position in respect to the sewer main On the line of the sewer mains Of line the sewer mains
III. According to their structures Open air detention basins Underground (covered) detention basins
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Detention (Retention) Basins: Kinds and Structures
Detention Basin on the Main Line with Gravity Emptying: Longitudinal Section (Scheme)
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Detention (Retention) Basins: Kinds and Structures
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Detention (Retention) Basins: Kinds and Structures
Screw Pumping Station at the Of Line Detention Basin
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Detention (Retention) Basins Volume Determination
I. Graphical Determination I - local hydrograph Hatched area represents the
detention volume Qmax/2 - chosen permanent water
discharge from the detention basin
II. Analytical Determination
V = Kdb.Qmax.to
V - detention basin volume
Kdb - detention basin coefficient
Kdb = 0.01 - 1,5; (Kdb = 0,25 - 0,55)
Qmax - hydrograph peak
to - time to peak
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Sewerage Pumping Stations
Purpose
I. Pumping Stations at the Sewer and Drainage Networks Rising sewer collector elevation Transportation of sewage and runoff to higher elevation Runoff discharge into receiving water
II. Pumping Stations at the Wastewater Treatment Plants Rising wastewater at the WTP inlet Sludge and wastewater transportation according to the technological
requirements Part of the sludge dewatering equipment
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Sewerage Pumping Stations (SPS)
Schemes Illustrating the SPS Purposea - Rising sewer collector elevation; б - Wastewater pumping transportation