DIN 1185-1:2015-12 Drainage - Control of sub-surface water management by draining with pipes and amelioration of the subsoil - Part 1: General principles
2015DIN 1185-1:2015-12 Drainage - Control of sub-surface water management by draining with pipes and amelioration of the subsoil - Part 1: General principles
2015DIN 1185-1:2015 Drainage - Control of sub-surface water management by draining with pipes and amelioration of the subsoil - Part 1: General principles
1973DIN 1185-1:1973 Drainage; Control of Sub-surface Water Management by Draining with Pipes, Open-ditch Drainage and Amelioration of the Subsoil; General Instructions and Special Cases