What can impact the design of a site's drainage system that is often unpredictable?

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The constancy of rainfall levels is a significant factor influencing the design of a site's drainage system because it directly affects water flow and saturation levels in the surrounding soil. Rainfall patterns can be unpredictable; they can vary greatly from year to year or even seasonally, which complicates the planning for adequate drainage.

When designers account for drainage, they rely on historical rainfall data to estimate how much water the system will need to manage. However, if rainfall levels deviate from the historical average—either through intense storms, droughts, or changes due to climate factors—this can lead to flooding or inadequate drainage capacity. Therefore, the variability in rainfall must be carefully considered, as it directly impacts how effective the drainage system will be in handling excess water during storm events.

In contrast, while soil stability, landscaping timeliness, and construction delays are important considerations in drainage design, they are generally more predictable or manageable aspects within the planning process compared to the variability of rainfall, which can drastically alter design requirements and system performance.

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