Question

A 150 m reach of sewer is to be designed to serve the area of the following details.

A 60 hectare (hec) drainage basin containing 40 hec net residential area with average 5 dwelling units per hec with 5 residents, and 20 hec zoned commercial area.                       

Take wastewater generation for

Residential = 225 L/capita/day

Commercial = 1500 L/hec/day

Peak I&I allowance = 800 L/hec/day

Peaking factor (PF) = 15.05 Q^-0.167

If the street elevation at upper manhole is 105 m and at the lower manhole is 102 m. Assume a minimum earth cover of 1.5 m, design the required sewer and provide all the necessary drawings.                                             

Answer 1

Mannings n was not given in question hence we assumed it as 0.015.Sewer line will atleast 1.5m below ground level.

Thank you.