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CHAP TER 1 PROJECT DESCRIPTION IDEA OF FUTURE VISION PROJECT The Future Vision housing scheme project is for providing an economical & perfect residential area for the people especially of the middle class society with the basic requirements. The required sewerage system is to be designed to facilitate the people.
GENERAL DESCRIPTION: The Future vision housing society is a complete residential neighborhood in all respects. The scheme comprises of:  An English-medium school.  Two hundred & Eighty one (281) houses divided into different blocks(A To M).  Three(3) flats & Apartments each.  a well equipped dispensary, with cooperative staff.  Parks.  Graveyard. These facilities provide ease to the residents All the basic necessities including electricity, gas, telephone and water are available. The scheme also has its own waste water treatment plant. Being adjacent to the Jhelum road, the housing scheme is very easily accessible by road, lying at just 15 minutes drive from Jhelum city.
GEOGRAPHICAL LOCATION: The Future Vision Society is situated on the west bank of the Upper Chenab canal, 10 km along the Jhelum road HOUSING PLAN: The Future Vision Housing project Housing Plan is divided into:  Independent Housing Plots  Apartments(3)  Flats (3)  The independent plots in the society have been divided into 13 housing blocks which are named: A to M for distinction.  The detail of no. of each housing units is given below
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Chapter 2 RELATED THEORY
SEWERAGE: It is the liquid waste or waste water produced as a result of water use.
SEWER: Sewer is a pipe or conduit, generally closed, and flow takes place under gravity.
SOURCES OF WASTE WATER: Sources of waste water or sewage are commonly encountered are: 
Domestic Wastewater It is the waste water from houses, office, other buildings, hotels and institutions.

Industrial Wastewater It is the liquid waste from industrial process.

Storm water It includes surface runoff generated by rainfall and the street wash.
COMPONENTS OF WASTE WATER ENGINEERING: 1) 2) 3)
Collection system (network of sewer pipes) Disposal work (sewage pumping stations, outfalls) Treatment works (for rendering waste water treatment)
TYPES OF SEWERS: 
Sanitary sewer It carries sanitary sewage i.e. waste water from municipality including domestic and industrial waste water.

Storm sewer It carries storm sewage including surface runoff and street wash.

Combined sewer It carries domestic, industrial and storm sewage.

House sewer It is the sewer conveying sewage from plumbing system of a building to common or municipal sewer.

Lateral sewer This sewer carries discharge from house sewer.

Sub main sewer
3 This sewer carries discharge from two or more laterals. 
Main / Trunk sewer It receives discharge from two or more sub mains.

Outfall sewer It receives discharge from all collecting system and conveys it to the point of final disposal.
TYPES OF SEWER SYSTEMS: 
Separate system In this system storm water is carried separately from domestic and industrial waste water.

Combined system In this system sewers carry both sanitary and storm water.
Partially combined system If some portion of storm or surface runoff is allowed to be along with sanitary sewage, the system is known as partially combined system. The sewerage system of the Future Vision scheme has been designed according to partially combined system, being the most economical option in a developing country such as Pakistan. 
DESIGN PERIOD FOR SEWER SYSTEMS: Design of Sewer system Period of design is indefinite, as the system is designed to care for the maximum development of the area. 1)
2)
Design of Sewage pumping station Design period is usually 10 years.
3)
Design of sewage treatment plant Design period is usually 15-20 years.
STRENGHT OF RCC PIPES: Three edge bearing test is used to measure the strength of R.C.C pipes. Load is applied on the pipe to produce 0.25mm crack. The test defines the load that can be safely supported by the sewer.
JOINTS IN SEWER PIPES: There are two types of joints in Concrete (up to 300 mm diameter) and R.C.C pipes (greater than 300 mm diameter)  Bell and Spigot joint (Employed for sewers from 225 mm to 600 mm diameter)  Tongue and groove joint (employed for sizes greater than 600 mm diameter)
SEWER APPURTENANCES: Appurtenances ate those devices, in addition to the pipes and conduits, that all essential for the operation of the sewer system. They include:
4 Manhole (provided when drop is less than 0.6m) Drop manholes (provided when drop is more than 0.6m) 3. Inlets An inlet is an opening into a storm or combined sewer for entrance of storm runoff. It is designed to permit the passage of water from the street surface into the sewer a) Curb inlet b) Gutter inlet c) Catch basins 4. Flush tanks 5. Inverted siphon 1. 2.
6.
PUMPING STATIONS: Used to elevate and transport waste water when:  Continuation of gravity flow is no longer feasible  Basements are deep  Any obstacle lies in the path of sewer  Receiving stream is higher than the sewer  Sewage is to be delivered to and above ground treatment plant
MAIN COMPONENTS OF SEWAGE PUMPING STATION: Screens  Dry well (for installation of pumps)  Wet well (for receipt of waste water)  Pumps (along with valves, force main, motor, control panel etc) 
Design of wet well and pump selection: In small pumping stations, where pump is sized to meet the peak the peak or maximum flow, the following considerations are made:  The detention time in the wet well at average flow should preferably be not more than 30 minutes.  The pump must run for at least 2 minutes  Cycle time must not be less than 10 minute.
CHAPTER 3
DESIGN CRITERIA Complete details are given here regarding all aspects of design of waste water disposal system for this project. The Design procedure aims primarily to determine the:  Diameters  Slopes of the pipes to be laid.
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THE SEWER SYSTEM: For the type of waste water disposal system, three(3 )options were available as shown below: TYPE OF SEWER SYSTEMS
CHARACTERISTICS
Separate system
All sanitary and storm sewage carried in separate sewer pipes.
Combined system
All sanitary and storm sewage carried in same sewer pipe.
Partially Combined system.
All sanitary sewage carried with a portion of storm sewage or surface runoff in same sewer pipe.
SELECTED SEWER SYSTEM:
Partially Combined system.
DESIGN SEWAGE FLOW CRITERIA In general, the design sewage flow for sewer system is calculated using the following equation:
Design sewage flow = Peak sanitary sewage flow + Storm sewage flow + Infiltration
PEAK SANITARY SEWAGE FLOW: The peak sanitary sewage flow is obtained by application of a “peak factor” to the average sewage flow. Relevant equation is as follows: Peak sanitary sewage flow = Peak factor × Average sanitary sewage flow There are two approaches for determination of peak sewage flow i.e. from WASA specifications or by using the Herman formula.
USING WASA SPECIFICATIONS: For the calculation of peak factor for the design purpose, the 1986 specifications provided by the WASA (Water and Sanitation Agency) have been referred.
AVERAGE SEWAGE FLOW (m3/day)
PEAK FACTOR TO OBTAIN Qmax
≤ 2500
4.00
2500 – 5000
3.40
5000 – 10,000
3.10
10,000 – 25,000
2.70
6 25,000 – 50,000 50,000 – 100,000
2.50 2.30
100,000 – 250,000
2.15
250,000 – 500,000 > 500,000
2.08 2.00
In our case, Peak factor for average sewage flow = 4.0
USING HERMAN FORMULA: An alternative method for determination of peak factor is by using the Herman formula. The formula is given below M
Q MAX 14  1 Q AVG 4 P
DESIG

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