Understanding the main pipes is not enough; an engineer must understand the network that supports them. Volume 2 covers manholes, drop manholes, inverted siphons, and storm water regulators. These are the "organs" of a sewerage system, ensuring flow is maintained and maintenance is possible.
While no exact replacement exists, free resources like (National Programme on Technology Enhanced Learning) notes and video lectures on wastewater engineering cover similar ground. For example: environmental engineering volume 2 by bc punmia pdf
The second volume is dedicated almost entirely to the engineering aspects of protecting public health and the environment from anthropogenic wastes. The table of contents typically includes: Understanding the main pipes is not enough; an