Principles and Practice of Engineering (PE) Civil: Water Resources and Environmental (WRE) Practice Exam 2025 – All-in-One Resource to Master Your PE Exam!

The option indicating "D. None of the above" is correct because all the methods listed, including pumping wells, drainage trenches, and vapor extraction, are strategies that can be employed in dewatering practices.

Pumping wells are commonly utilized in construction to extract groundwater from the soil, effectively lowering the water table and allowing for a drier working environment. This method is particularly useful for sites where groundwater is present and poses a risk during excavation.

Drainage trenches serve a similar purpose by collecting and directing water away from construction areas. By creating a path for water to flow, these trenches help manage surface water and groundwater, reducing the potential for flooding or water accumulation at the site.

Vapor extraction, while primarily used for removing volatile contaminants from soil and groundwater, also contributes indirectly to lowering the water table. This method typically involves extracting water vapor and can be essential in sites that require remediation along with dewatering.

Given that all listed methods are valid approaches to dewatering, the option stating "None of the above" accurately reflects that all are indeed recognized techniques used to reduce water levels at construction sites.