What is the typical result of ponding or poor roofing system drainage?

The typical result of ponding or poor roofing system drainage is indeed immediate changes in slope and structural integrity of the deck. When water accumulates on a roof due to inadequate drainage, it can create excessive weight that the roofing structure is not designed to support. Over time, this added stress can lead to structural deformation, such as sagging or changes in the slope of the roof deck. Additionally, stagnant water can weaken roofing materials and promote issues such as leaks, mold growth, and deterioration, further compromising the integrity of the roof. This, combined with the potential for increased wear and tear on the roofing system, emphasizes the importance of ensuring proper drainage to maintain both the functionality and the longevity of a roofing structure.

The other options do not accurately represent the effects of ponding or poor drainage. An increase in roof lifespan would contradict the detrimental effects of water accumulation, while enhanced insulation properties and the formation of a peaceful water feature do not align with the negative consequences that poor drainage typically brings.