Basin Detail Diagram.pdf

This document is a technical specification drawing for a 12-inch basin detail, presenting both sectional and plan views of a stormwater management basin configuration. The drawing illustrates a 12-inch perforated riser with cast iron grate positioned at the basin outlet, supported by a 6-inch rootzone mix layer and a 3/8-inch gravel layer. The basin features a 4-inch concrete base with integrated inlet and outflow pipes, designed to manage water drainage through a structured filtration system. The plan view depicts a 4-foot box drain configuration surrounding the basin perimeter with a 3/8-inch gravel bed, showing the concrete base with integrated drainage components and grated inlet opening positioned centrally within the basin structure.

The specification establishes the material composition and dimensional requirements for basin construction, including the concrete foundation depth, aggregate layers, and pipe sizing for stormwater conveyance. The design incorporates drainage infrastructure components such as the perforated riser, cast iron grate, inlet and outflow pipes, and gravel filtration bed to facilitate proper water management and sediment control. This technical drawing appears to serve as a construction reference document for implementation of stormwater basin improvements as part of a broader project scope.