What is a potential problem with porous materials located near a house?

The situation described refers to the characteristics of porous materials when they're positioned close to a house. The correct choice points out that if these materials are situated near a structure, and the earth beneath them is impervious and slopes toward the house, it can lead to water accumulation and drainage issues.

When porous materials, like certain types of garden soil or gravel, allow water to pass through them, they can seem beneficial for drainage. However, if the underlying soil is impervious, such as clay, it will not absorb additional water, causing it to pool and potentially flow toward the foundation of the house. This can lead to water-related problems, including flooding or foundation damage over time.

The other options do not accurately identify potential problems with porous materials. Quick drainage can be a benefit, and porous materials are not universally beneficial for landscaping; they depend on the context and the specific materials used. Maintenance of porous materials can also vary based on the type, making it less of a consistent problem. Thus, understanding the implications of local soil composition and topography in relation to porous materials is crucial for effective property and building inspection.