Which actions are NOT possible solutions to conserve water?

Disposing of waste into canals and rivers is not a solution to conserve water; rather, it can lead to pollution and further degradation of water quality. When waste is dumped into these bodies of water, it can contaminate the water supply, harming ecosystems and making it unsafe for both human use and wildlife. This action does not address water conservation or efficient use; instead, it exacerbates environmental issues.

In contrast, turning off taps when not in use is a straightforward practice that significantly reduces unnecessary water consumption. Fixing leaks in homes also helps conserve water by preventing waste from unnoticed drips or breaks in plumbing, which can lead to substantial water loss over time. Using a garden hose to clear away dirt and debris is less efficient than alternative methods, such as sweeping or using a bucket of water, but it can still use a considerable amount of water compared to those other practices. Thus, the correct answer highlights an action that is directly harmful rather than beneficial towards conserving water resources.