sewerage network
Post on 25-May-2015
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Introduction to Sewerage Network Design
Presented by Mazhar Alam
Basic Definitions
• Sewage
• Sewer
• Sewerage
Basic Definitions
Sewage It is mainly liquid waste containing some
solids produced by humans and industry. Foul water , waste water.Grey water-Non faecal. From washingBlack water-Contains faecal matter. It needs full treatment.
Basic Definitions
SewerAn artificial conduit (or pipe) or system of conduits used to convey sewage from source to sewage treatment facility.
Basic Definitions
SewerageThe system of sewers that conveys wastewater (sewage) to a treatment plant or disposal point.
It includes all the chambers, manholes, gravity mains, pumps, rising mains, air valves, washouts etc
Design of Sewerage NetworkInformation Required•Design Criteria
•Master Plan Layout Drawing
•Levels
Design of Sewerage NetworkDesign CriteriaIt describes the parameters to be used in design;•Sewage generated per person•Minimum, maximum & proportional velocity•Minimum slopes•Peaking factors•Pipe diameters and material etc•Minimum Backdrop height.
Design of Sewerage NetworkSewage generated per personIt depends on the type of occupancy or land use details of the facility to be served. e.g. residential, commercial, recreational.
Qasr Al Sarab sewage generated from villas - 275 l/p/d
Hotels – 298 l/p/d
Design of Sewerage NetworkMin. , Max., Proportional velocityMin. velocity is normally 0.75m/s at full capacity to allow for self cleaning.
Max. velocity is 2.5 to 3.0m/s.
Proportional velocity is the actual velocity at given flow. 0.6m/s
Design of Sewerage NetworkMinimum slopesFor a given diameter and roughness minimum slope is required to achieve min. velocity.
Dependent on the pipe diameter and roughness e.g. for dia=200 and k=0.6 the minimum slope is 1:240.
For lager dias the minimum slope is 1:1000
Design of Sewerage NetworkPeaking FactorBabbitt A/(P)^B ( A=0.176,B=5.096)
Abu Dhabi (18+sqrt(P))/(4+sqrt(P))
Harman 1+(14/(4+sqrt(P))
Design of Sewerage NetworkPipe dias & materialIn the UAE
Minimum pipe dia is 200mm for main line and
150mm for house connection pipe.
Material;
uPVC – for smaller dias
GRP – for larger dias
Design of Sewerage NetworkMinimum backdrop height•Avoid direct fall
•Splashing
•Erosion of benching
•Smooth transition
•Minimum value. 600mm to 700mm
Design of Sewerage NetworkMaster Plan Layout Drawing•Plot – types and land use details
•Road corridor – ROW for services
•Location of STP or final disposal point
Design of Sewerage Network Levels•Spot Levels
•Contours
•Finished Road Levels
Design of Sewerage NetworkSteps in design
• Marking the network on layout.
• Calculating the population
• Hydraulic design
• Final presentation drawings.
Design of Sewerage NetworkSteps in design
Marking the network on layout.• Gravitating the network• House connection chambers- at each plot• Manholes- maximum spacing• Angle b/w incoming & outgoing sewer.• Max. no. of connections to a manhole.
Design of Sewerage NetworkSteps in design
Population calculations.• Type of plot single storey or multi rise.• Type of occupancy i.e. villa, hotel, office,
school, restaurant etc.• Equivalent population.
Design of Sewerage NetworkSteps in design
Hydraulic design.
• Spread sheet - Excel
• Software – WinDes, PipeMate, Sewer CAD.
Design of Sewerage NetworkSteps in design
Final presentation drawings.
To show pipe dias, invert level, cover levels, manhole types etc.
• Manhole schedule
• Layout drawings
LINE DIAGRAM- SEWAGE NETROWK
Phase III• Commissioned in 1993• The Works provided an additional capacity of 25700 m3/d
• Client : • Sharjah Municipality Drainage Section (SMDS)
• Civil Contractor: • Six Construct
• PM /M&E RE :
• Consultant :
• M&E Contractor: • PCL
• Halcrow
• Martin Davis• Civil RE : • Stephen Smythe
LINE DIAGRAM- SEWAGE NETROWK
3D VIEW - WINDES
3D VIEW - WINDES
MANHOLE SCHEDULE – WINDES OUTPUT
LOND SECTION - WINDES
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