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Congratulations! You have successfully finished the first part of the lesson. The lesson continues in the form of a script. Please take all further information from the following script “History of municipal drain and sewer systems”. Stay curious! |
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Aug 10, 2015 This module provides an overview of the historical development of water supply and sanitation and their meaning cultural development of mankind. After completing this module, you will have knowledge regarding:
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Aug 10, 2015 What is the purpose of drain and sewer systems? Drain and sewers systems are part of the overall wastewater system that provides a service to the community and are used for the collection and transport of wastewater and other rain water runoff in an urban area. [EN752:2017] (Image: General structure of a drain and sewer system) |
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Aug 10, 2015 What are the boundaries of drain and sewage systems defined? Boundaries of drain and sewer systems are defined as follows:
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Aug 10, 2015 (Image: Objectives of drain and sewer systems) Relevant objectives of drain and sewer systems must focus on:
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Aug 10, 2015 (Image: Icon: Paragraph) The objective of drain and sewer systems is to design, construct, operate, maintain and rehabilitate the system in order to minimise the health and safety risks associated with the conveyance of wastewater, which means to:
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Aug 10, 2015 (Image: Icon: Construction site) The objective is to minimise the occupational health and safety risks likely to arise during construction, operation, maintenance and rehabilitation. [EN752:2017] (Image: Inspection of an accessible sewer - Protective equipment) (Image: Inspection of an accessible sewer) (Image: Danger of collapse of a sewer - Health and safety of the operating personnel is endangered) |
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Aug 10, 2015 (Image: Icon: Soil investigation) The objective is to design, construct, operate, maintain and rehabilitate the drain and sewer system to minimise the impact on the environment. The impact on the receiving waters shall meet the requirements of any national or local regulations or the relevant authority. Other environmental requirements specified by any national or local regulations or the relevant authority shall be met as well. [EN752:2017] (Image: … |
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Aug 10, 2015 (Image: Icon: Economy) The objective is to design, construct, operate, maintain and rehabilitate the system at the best environmental, social and economical costs, that includes:
[EN752:2017] |
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Aug 10, 2015 In order to achieve the mentioned general objectives, already existing or planned drain and sewer systems have to comply with the following functional requirements [EN752:2017]:
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Aug 10, 2015 Survey on the functional requirements for an already existing or planned drain and sewer system according to [EN752:2017] [FI-S&P] Protection against flooding (Image: Icon: Protection against flooding) Flooding from drains and sewers have to be limited to nationally or locally determined frequencies under consideration of: The effects on both health and safety;
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Aug 10, 2015 Survey on the functional requirements for an already existing or planned drain and sewer system according to [EN752:2008] [FI-S&P] Protection of Groundwater (Image: Icon: Protection of groundwater) Groundwater is a subject of protection and has to be protected against pollution within the framework of nationally or locally determined limits while considering the effects of the drain and sewer system onto the local enrichment of groundwater reservoirs. … |
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Aug 10, 2015 Survey on the functional requirements for an already existing or planned drain and sewer system according to [EN752:2017] [FI-S&P] Sustainable use of products and materials (Image: Icon: Sustainable use of products and materials) Products, material and construction methods are to be selected considering the life span of the structural components and their recycling/reuse potential in order to minimise the depletion of finite resources. Sustainable use … |
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Aug 10, 2015 Survey on the functional requirements for an already existing or planned drain and sewer system according to [EN752:2017] [FI-S&P] Maintenance of the flow (Image: Icon: Maintenance of the flow) The drain and sewer system must be planned, constructed, maintained and operated to reliably convey all design flows that can legally be discharged into the system to the point of discharge, ensuring that the operation of the system is safe, environmentally acceptable … |
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Aug 10, 2015 Survey on the functional requirements for an already existing or planned drain and sewer system according to [EN752:2017] [FI-S&P] Composition of the wastewater that is introduced into the system (Image: Icon: Composition of the wastewater that is introduced into the system) The drain and sewer system might be planned to allow for a discharge of both domestic and non-domestic wastewater. The composition of the non-domestic wastewater must be monitored … |
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Aug 10, 2015 According to EN 752 functional requirements cover the drain and sewer systems, together with combined sewer overflows, pumping installations and other components, including the effects of their discharges on receiving waters and the receiving wastewater treatment plant. The requirements shall be considered in respect of the whole system to ensure that additions or modifications to the system do not result in failure to meet the target standards. [… |
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Aug 10, 2015 An important mental framework in the standard is expressed in the so-called pyramid diagram. Managing a sewer system means making sure the system’s objectives and functional requirements are met. If the management authority is the municipality, this involves the responsibility for all sewer system objects (sewers, manholes, pumping stations) located outside buildings in public areas (the outside sewer system) as well as the responsibility for the … |
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Aug 10, 2015 In which components can drain and sewer systems be divided? According to that definition and depending on the statutory responsibilities, drain and sewer systems can be subdivided into the following system components:
(Image: Allocation of the used terms) |
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Aug 10, 2015 (Image: Planning area of urban drainage systems according to DIN EN 752) Drain and sewer systems and wastewater treatment plants represent the sewage disposal system or urban wastewater system. Together with the bodies of water affected by sewage discharge (groundwater, surface receiving water), they form the planning area of urban drainage systems. [EN752:2017] (Image: Planning area of urban drainage systems according to DIN EN 752) |
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Aug 10, 2015 Drain and sewer systems can be used in practice in three different operating types or combinations of them: Gravity system (Image: Gravity pipeline) Pressure system (Image: Pressure pipeline) Vacuum system (Image: Vacuum pipeline) |
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(Image: Gravity sewer) What is a gravity sewer system? A gravity sewer system is a drain or sewer system where flow is caused by the force of gravity and where the pipeline is designed usually to operate partially full. [EN752:2017] (Image: Gravity pipeline) What is a gravity sewer? The sewer is designed to serve as a gravity sewer, i.e. one that operates with partial filling of the cross-section of the pipe so that the effluent in the pipe is under ambient … |
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What is a sewer system? A sewer system is a network of pipelines and associated structures (manholes, pumping stations, storm water holding facilities, etc.) that conveys sewage from drains to treatment works or other places of disposal [EN16323:2014]. What is a sewer? A sewer is a pipeline or other construction, usually underground, designed to carry wastewater from more than one source [EN752:2017]. Depending on the type of sewage to be drained, a … |
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