Design Approach

For design of sewer network, the slope and diameter of sewers should be decided to meet the following two conditions:

(a)        A self-cleansing velocity is maintained at present peak flow.

(b)       A sewer runs at 0.80 full at ultimate peak flow.

Since the sewer network design computations are repetitive and hence it can be easily done by tabular form or by using suitable computer software programmes.

                                              Figure 2: Profile of a Sanitary Sewer