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The guideline presents an abridged version of the German original edition, published by the Ministry for Environment and Nature Protection, Agriculture and Consumer Protection of the German federal state North Rhine-Westphalia (MUNLV NRW) and offers an overview, presented for the first time in this form and quality, of the possibilities of trenchless installation of non-accessible drains and sewers.

The ever-increasing urbanization has not only changed our landscape and living condition, but has also placed a growing demand on the infrastructure needed to support it. As a result, a great deal of attention has been placed on developing technologies capable of operating in these increasingly complex environments. In the field of underground pipe installation, horizontal directional drilling (HDD) has become an essential resource.