ASCE 12-13/13-13/14-13

Standard Guidelines for the Design of Urban Subsurface Drainage (ANSI/ASCE/EWRI 12-13); Standard Guidelines for the Installation of Urban Subsurface Drainage (ANSI/ASCE/EWRI 13-13); and Standard Guidelines for the Operation and Maintenance of Urban Subsurface Drainage (ANSI/ASCE/EWRI 14-13)
standard by American Society of Civil Engineers, 11/15/2013