scope:

The intent of these standard guidelines is to present state-of-theart design guidance for urban subsurface drainage in a logical order. It updates ASCE/EWRI 12-05 Standard Guidelines for the Design of Urban Subsurface Drainage with material developed within the past five years. The collection and conveyance of subsurface drainage waters are within the purview of these standard guidelines for applications such as airports; roads; other transportation systems; and industrial, commercial, residential, and recreational areas. Incidental surface water is considered.

These standard guidelines do not address agricultural drainage, landfills, recharge systems, detention ponds, conventional storm sewer design, or the use of injection systems.

Customary units and standard international (SI) units are used throughout this document.