File:Screenshot 2025-09-22 120027.png

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Flood, water quality and water balance control in a hybrid trench and bioretention system. Water quality and water balance storage are provided through infiltration below the underdrain. Active storage above the underdrain provides channel and flood protection. The underdrain may be fitted with an orifice to meet release rate requirements. The infiltration rate increases with hydraulic head, resulting in potentially higher rates of volume reduction through infiltration than conventional LID not designed for flood control. Inlets consisted of a distributed network of curb cuts draining to high flow through cobble/gravel columns (roughly 1 x 2 m). Source of base image: Schollen and Co.)

The accounting of inflow and outflow of water in a system according to the components of the hydrologic cycle.

A shallow excavated surface depression containing prepared filter media, mulch, and planted with selected vegetation.

A perforated pipe used to assist the draining of soils.

The rate at which stormwater percolates into the subsoil measured in inches per hour.

Low Impact Development. A stormwater management strategy that seeks to mitigate the impacts of increased urban runoff and stormwater pollution by managing it as close to its source as possible. It comprises a set of site design approaches and small scale stormwater management practices that promote the use of natural systems for infiltration and evapotranspiration, and rainwater harvesting.

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