ASCE 12-92/13-93/14-93

Standard Guidelines for the Design of Urban Subsurface Drainage (ANSI / ASCE 12-92) Standard Guidelines for Installation of Urban Subsurface Drainage (ASCE 13-93) Standard Guidelines for Operation and Maintenance of Urban Subsurface Drainage (ASCE 14-93)
standard by American Society of Civil Engineers, 1994