Final answer:
In engineering, manholes are spaced apart based on factors such as infrastructure type and local regulations. Recommendations suggest spacing manholes around 8 diameters side-to-side and 15 diameters deep to allow for proper access and maintenance of underground utilities.
Step-by-step explanation:
In engineering, the distance between manholes can vary depending on several factors such as the type of infrastructure, the size of the pipes or cables they house, and local regulations. Historically, manholes were placed around 5 side-to-side and 7-8 deep, but more recent recommendations suggest spacing them as much as 8 diameters side-to-side and 15 diameters deep. These measurements help ensure proper access and maintenance of underground utilities.