What factor does NOT influence the height of granular backfill?

The height of granular backfill is primarily influenced by various physical and regulatory factors that determine how the backfill behaves and how it must be constructed to meet safety and functional requirements. While the type of collector pipe is an important consideration in drainage design and performance, it does not inherently determine the physical height of the granular backfill.

Soil type significantly impacts settlement, compaction, and load-bearing capacity, which directly correlates to the structural integrity required in backfill projects. Local building codes provide specifications and standards that may dictate certain design criteria or methods of construction, and project specifications often detail the required materials and compaction techniques. In contrast, the collector pipe itself does not affect how high the granular backfill must be placed, making it the factor that does not influence backfill height.