California Supplemental (CSE) Practice Exam

What precaution is suggested to prepare for flooding?

1. Seal walls of basement with paint

2. Install "check valves" in sewer traps

3. Lower the foundation level

4. Build structures without elevation

The correct answer is: Install "check valves" in sewer traps

Installing "check valves" in sewer traps is a recommended precaution for preparing for flooding because these devices help to prevent floodwaters from backing up into the home through the sewer system. When floodwaters rise, they can create pressure that forces water to flow backwards through the sewage system and potentially into basements and other low-lying areas of a structure. Check valves serve as a barrier, allowing sewage to exit the home while blocking floodwaters from entering. This precaution is particularly important in areas prone to flooding because it both protects the interior of the home from water damage and helps to maintain sanitary conditions by preventing the potential contamination that could result from floodwater mixing with sewage. The other options do not effectively mitigate the risk associated with flooding. Sealing basement walls with paint may offer some waterproofing at a superficial level, but it does not address issues related to sewer backup. Lowering the foundation level can exacerbate the problem by increasing the risk of flooding, and constructing buildings without elevation significantly increases vulnerability to flood-related damages.