Standard Guideline for Infiltration-Based Stormwater Control Measures for Permeable Soils: Principles of Design, Installation, and Operation and Maintenance

Abstract Submission: Urban stormwater runoff may contain a variety of pollutants that are discharged to the receiving water body without any form of treatment. Therefore, the management of urban stormwater runoff must be considered in urban planning, development, and redevelopment using an integrated approach that improves and protects the quality of the receiving waters. This involves controlling sources of pollutants that are mobilized during storm events, reducing urban stormwater runoff volumes, and treating urban stormwater runoff. This document is a standard guideline for infiltration-based stormwater control measures (SCMs) for permeable soils and addresses their design, installation, and operation and maintenance. SCMs are structural controls that capture stormwater runoff that would otherwise discharge to surface water bodies, along with suspended and dissolved constituents, and infiltrate the runoff to the subsurface, which recharges the groundwater while sequestering/degrading any pollutants in the unsaturated zone. Three types of widely used SCMs are addressed in this standard: dry wells, vegetated (grassy) swales, and infiltration trenches. Typical designs are presented for each along with methodologies for estimating their capacities. Optimization approaches for sizing are also described. The standard also provides guidance on the installation and operation and maintenance of these SCMs. This standard represents the consensus of the Standards Committee on Fitting of Hydraulic Conductivity Using Statistical Spatial Estimation (called KSTAT) of the Standards Development Council (SDC) of the Environmental and Water Resources Institute (EWRI) of ASCE. This standard guideline is the sixth in a series of standards that seeks to enhance the probabilistic and empirical characterization and understanding of the saturated hydraulic conductivity (Ks), a key groundwater parameter. The standard will be published in EWRI-ASCE in 2025.

Learning Objectives/Expected Outcome (Optional) : Standard guideline for infiltration-based stormwater control measures (SCMs) for permeable soils: design, installation, and operation and maintenance. Three types of SCMs: dry wells, vegetated (grassy) swales, and infiltration trenches.