Water and wastewater pipeline assessment technologies : classification systems sensors and results interpretation This book aims to build a layered understanding of inspection technology: first some background for the state of infrastructure in the United States will be discussed. If you are working in this field you will have an appreciation of the level of disrepair some assets have fallen into. If you are new to the industry prepare for a surprise that will make you think twice about spending time on manhole covers or catch basins. This discussion will outline the need for comprehensive inspection programs and may cause you to rethink the way you currently do things in your municipality or firm