Sewers with storage capacity are elongated reservoirs, usually pipes with large man-accessible diameter. Their function coincides transport and storage. A distinction is made between:

• Sewer with Storage Capacity with Top-end Overflow and

• Sewer with Storage Capacity with Bottom-end Overflow.

Sedimentation tanks are located only in storm sewers of separate sewer system. They are installed in case that the collected surface water needs to be treaded before being discharged into the surface or ground water. The collected surface water is roughly desludged and the suspended and floating matter is retained.

Depending on the type of sedimentation tanks a distinction is made between:

• Sedimentation tanks or dry basins without retention (not constantly …

Congratulations!

You have successfully finished this lesson.

Next you will have the opportunity to review the newly acquired knowledge with an interactive questionaire.

You can of course still navigate back to any point of lesson if you wish to review a specific point or subject.

Stay curious!

This module provides the essential basic knowledge regarding materials, sealing systems, and functions of manholes as well as requirements and methods of connections to manholes. With regards to road catch basins, their function and types of construction are explained, as well as the possibility of using these systems for decentralized solids retention. The content concludes with stormwater basins and how they are differentiated in terms of function, type, drainage system and layout.

After completing this module, you will have in-depth knowledge regarding:

• functions of and requirements for manholes, as well as materials and sealants used;
• types of construction and main components of road catch basins, as well as the type of connection to the sewer or manhole;
• requirements for connections, as well as variants of connection to manholes;
• differentiation of stormwater basins in terms of their function, by type and drainage system, and by arrangement and tasks.

The costs of trenchless installation can be divided into direct and indirect costs.

Direct costs are understood to be the immediate costs of installing a sewer. They are identical to the cost of construction and are influenced by the local conditions of the particular method of construction. A part of the costs can thus no longer be influenced.

They are made up of:

• Depth of installation
• Type of in-situ soil
• Groundwater level
• Topographical circumstances

From the fact that jacking with point, compared with linear construction sites in the open cut method, is sufficient, there …

Line and level of the sewer to be newly installed given by the general dewatering plan and sewage removal concept or the results of the sewer net planning, especially the hydraulic calculation (nominal pipe size, gradient) should be entered into the site and height plan within the scope of the planning so that a first impression of the topographic and local conditions, section length (manhole distances), surfacing and especially the positional depth …

(Image: Standardised sewer cross sections with geometric values for fully filled to DIN 4263 (04.91) [DIN4263])

Sewers with the most varying cross sections and dimensions have been used since the beginning of modern sewage technology and some are still in use to this day.

The most important cross-sectional shapes are the circular, the normal ovoid and the normal arch cross sections (Bild 1.3).

The circular cross section was and still is preferred in …

Depth of cover is designated in EN 1610 [DINEN1610:1997] as the "vertical distance from the top of the pipe barrel to the surface".

The depth of the cellar bottom to be drained normally defines the minimum depth of cover of the combined water and wastewater sewers.

Taking into account the required minimum gradients of 1.0 % to 2.0 % for the laterals and pipes whose course follows the access path under all the supply lines, and the depth of the cellar …

The regions in the trench are divided, according to EN 1610 [DINEN1610:1997] (Bild 1.6.1.2) into embedment and main backfill.

The embedment comprises the areas of the bedding, the sidefill and the initial backfill for trench piping in the width of the trench; for piping in embankments or very wide trenches it is a width three times the outside …

Up to the 40's of the 20^th Century, the backfill of the embedment, i.e. the filling of the space between pipe and pipe trench wall was carried out by means of running sand or, at last a sandy ground up to 50 cm above the crown of the sewer, from which level up to 15 cm to 20cm thick soil could be compacted [Braub25].

DIN 4033, issue (11.79) [DIN4033:1979], which is also referred to in the ATV rules and standards prescribes the following for the pipe …

Private domain sewers are "Inaccessible pipelines laid in the earth or in the foundation that usually carry sewage to the lateral" [DIN1986:1998] (Bild 1.9.1) (Bild 1.9.1) (Bild 1.9.1).

In the rehabilitation of sewer systems, neighbouring or crossing supply lines ranging from telephone cables to district heating piping may cause considerable difficulties.

Therefore, their position to the defective sewer, their structural condition and the condition of the surrounding embedment are important criteria for the selection …