Underdrain With Curb & Gutter

The technical drawing illustrates a cross-section of an underdrain system with a curb and gutter. In the top portion, there is a curb and gutter profile featuring small dots and lines representing concrete texture. Below the curb, an array of rounded shapes represents pea gravel backfill. Centrally, a section of a perforated underdrain is depicted, highlighted by its hexagonal pattern. The underdrain is enclosed within the gravel, measuring 12 inches in width and located 3 inches below the gravel surface. Two labels point to the pea gravel backfill and the 6-inch HDPE perforated wrapped underdrain, detailing the components of the drainage system.