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Sanitary Sewer Design Example 3

Design a sanitary sewer to serve a population of 5,000 people, if the average consumption is 400 liters per capita per day (lpcd). How many extra persons can be served if the slope is doubled? Using "n" value of 0.013 in the Manning's formula & the return flow as 70%. Check the minimum self-cleaning velocity. Neglect infiltration & inflow?

Sanitary Sewer Design Example # 1

Design a sanitary sewer to serve a population of 5,000 people, if the average consumption is 400 liters per capita per day (lpcd). How many extra persons can be served if the slope is doubled? Using "n" value of 0.013 in the Manning's formula & the return flow as 70%. Check the minimum self-cleaning velocity. Neglect infiltration & inflow?

How to Design Sanitary Sewer using Manning's Equation

Calculate the anticipated future (ultimate) population of area served by the sewer using ultimate population density.< Multiply the ultimate population by per capita average daily sewage flow to obtain the average daily sewage flow e.g. Select or calculate peaking factor (P.F) & Peak hourly waste water flow

How to Estimate the Design Flow for a Sanitary Sewer

Design flow for sanitary sewer can be find as shown in steps below: Calculate the anticipated future (ultimate) population of area served by the sewer using ultimate population density. Multiply the ultimate population by per capita average daily sewage flow to obtain the average daily sewage flow. Select or calculate peaking factor (P.F)

Techniques for Sewer Condition Assessment

Zoom cameras Closed-circuit television Digital scanners Laser profilers Remote sensing diagnostic techniques Zoom cameras Cost and time saving preliminary inspections 
 Main premise is that most of sewer problems occur at or near maintenance holes 
 Provide good quality imagery up to 20-75 m pipe length Able to survey 150 to 1525 mm diameter sewers 
 Colour videos and digital images saved on optical storage devices

Design procedure for sanitary sewers

Calculate the average wastewater flow, Qavg = (70-80) % of average water consumption. Select a peak factor, PF = [(18+√P)/(4+√P)], where P = population in thousands. Calculate the peak wastewater flow, Qpeak = (PF * Qavg)

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