https://padlet.com/nsabrinasalleh/7az3rlzkhndbz3l5 Made by Nur Sabrina Binti Mohd Salleh 17DKA18F2029 en-us 2020-10-27 03:56:36 UTC 2024-10-27 13:40:26 UTC hello@padlet.com https://padlet.net/icons/png/1f30a.png nsabrinasalleh https://padlet.com/nsabrinasalleh/7az3rlzkhndbz3l5/wish/864329832
COMBINED SYSTEM
• When both sanitary sewage and storm water are carried in a single sewer, it is called a combined system.
• When the flow in a combined sewer consist of only domestic sewage and industrial waste without storm water, flow is called "DRY WEATHER FLOW"
 
ADVANTAGES
• Easy cleaning because of larger diameter.
• Reasonable maintenance cost.
• Strength of sewage is reduced due to dilution
of sewage by storm water.
• This system requires only one set of sewer
making it economical

DISADVANTAGE
• In storm season sewer may overflow and the
sewer may damage causing serious health risks
• The combine sewer gets silted and becomes foul
in dry days
• Load on treatment plant is more because storm
water is also carried there
• The storm water gets polluted unnecessarily
• The system becomes uneconomical when
pumping is needed

SEPARATE SYSTEM
• In this system two separate sets of sewer are installed, one for collection and conveyance of sanitary sewage and other for storm water.
• As storm water is carried separately, it is not foul in nature and normal coarse without any treatment.
• Where as the sanitary sewage is taken to treatment plant separately and after requires treatment  it is disposed off.

ADVANTAGES
• The load on treatment plant is less as only
sewage is carried to the plant.
• The size of sewer is small, thus economical
• When pumping is required, the system proves
to be economical.
• Natural/storm water is not unnecessarily
polluted by sewage.

DISADVANTAGE
• Cleaning of sewer is difficult due to their small
size.
• The self cleansing velocity is not easily obtained.
• The storm sewers come in operation in rainy
season only. They may be chocked in dry season
by garbage.
• Maintenance cost is high.
• They are likely to get chocked.

PARTICALLY SYSTEM
• There are two collection system or pipe network:
    > for collecting domestic sewage as sanitary sewerage system
    > for collecting storm water as strom water drainage system

ADVANTAGES
• It combines the good features of both systems.
• The silting is avoided due to entry of storm
water.
• The storm water from houses is easily
disposed off.
• The sewers are of reasonable size.

DISADVANTAGE
• A very small fraction of bad features of
combined system are there in partially
separated system.
• laying two sets of sewer is costly
• Small sewer easily get shocked and are difficult to clean]]> 2020-10-27 04:04:02 UTC https://padlet.com/nsabrinasalleh/7az3rlzkhndbz3l5/wish/864329832 nsabrinasalleh https://padlet.com/nsabrinasalleh/7az3rlzkhndbz3l5/wish/864419506 • The system must be drawn to show the location  of the pipe and so on. The process involved of:
  > Preparing the sewerage layout plan to shown the flow of sewerage , position of the network, size of pipe and position of manholes

• Sewer follow natural drainage  ways to minimize excavation and pumping requirements. Large trunk sewers are usually constructed in low-lying areas closely paralleling streams or channels. in general, pipes should cross contours at right angles.

• Located pipe
  > place for easy connection for future user
   > provide access for maintance 
> accomplished by placing them in streets or other right of way]]> 2020-10-27 04:58:20 UTC https://padlet.com/nsabrinasalleh/7az3rlzkhndbz3l5/wish/864419506