Examples for records of incidents are according to EN 752:

Flooding, blockages, breakdown of sewers, functional failure of a pressure line, disease, physical injury or fatal accidents of the operational staff or other people, sewer damage, compliance to the conditions for the discharge into the drain and sewer system and the receiving waters, visual inspection, complaints regarding odour nuisance, hydraulic recalculations, functioning of the mechanical …

What is relevant informationen?

What if inventory data is incomplete?

In the following, the investigations in accordance with EN 752 presented are partly reflected in the term condition assessment, which includes all measures for determining and assessing the structural/operational, hydraulic and environmentally relevant actual status of drain and sewer systems

For what is the inspection a prerequisite?

The inspection is an essential prerequisite for avoiding problems with regard to liability law, tax law, civil law and regulatory frameworks as well as to ensure an economic management of wastewater discharge by:

• An identification of functional disturbances,
• An early identification of structural defects and their causes,
• A decrease of infiltration through incorrect connections,
• An avoidance of groundwater …

When does the inspection come into play?

An inspection is carried out within the framework of:

• Scheduled inspections as a part of self-monitoring,
• Inspection as a part of the final “acceptance of sewer”,
• Inspection prior to the end of the statutory period of limitation for claims arising from any defects (warranty inspection),
• Detection of operational disorders,
• Preparation/execution of rehabilitation measures,
• Execution of special tests and …

Which sources of information should be used to determine measures?

So-called preliminary exploration measures, including a review and evaluation of all available documents and data, serve to determine the necessary external inspection measures.

The following sources of information can be used:

• For the previous history of structural related issues: Civil engineering departments, road construction offices, offices for the environment, local mining authorities, …

This module provides an introduction to the first of the four basic activities within the framework of integral urban drainage management according to EN 752, the INVESTIGATION. It is intended to cover all performance aspects of the drain and sewer system to the appropriate extent in order to provide the basis for the subsequent assessment of their performance. Therefore, this module provides an overview of the required investigation steps, collection and review of relevant information, and procedures for investigating the structural and operational condition of drain and sewer systems.

After completing this lesson, you will have knowledge regarding:

• The purpose of an investigation;
• The necessary investigation steps and required relevant information; and
• Procedures for investigating the structural and operational condition of drainage systems.

Summary:

This module teaches the basics of geotechnical investigations for civil engineering purposes. The described subsoil investigation by indirect (e.g., drilling methods) and direct exploration methods (e.g., dynamic sounding) form the basis for an understanding of a civil engineering description and evaluation of soil and rock.

Objectives:

After completing this module, you will have a sound knowledge of:

• The objective of a geotechnical investigation;

With regard to structural engineering, geotechnical investigations are understood to include all analyses required from the fields of (engineering) geology, hydrogeology, geophysics, soil mechanics, rock mechanics, environmental engineering and chemistry to describe and assess both soil and rock. The analyses involve bench tests as well as field tests.

The investigations include both

• Field as well as
• Lab tests.