What is the definition of "sand" in relation to well construction?

The chosen definition relates to well construction by accurately identifying sand as detrital material characterized by its specific grain size. In the context of well drilling and construction, sand plays a critical role as a filter medium and is often used in combination with gravel to create an effective well screen. This configuration facilitates groundwater flow while filtering out larger sediments and particulates from the entering water.

In addition to its function in structural integrity, understanding the grain size of sand is essential for engineers and contractors. Different sizes can impact the porosity and permeability of the aquifer, affecting the well's efficiency and output. Therefore, this definition encompasses both the physical properties of sand and its functional significance in the construction and operation of wells, making it the most accurate choice among the options provided.