6.3. Functional analysis of the subsystems
The result of the initial design (conceptual design) of the drinking water supply system concretizes in the down
decomposition (top down) given in Figure 3; the definition of each subsystem is given as follows:
• Capting
The capture concerns either groundwater (springs, aquifers) or surface waters (rivers, lakes or even seas).
• Water Treatment
The treatment is almost always necessary to obtain hygienic water, thus clean for any type of consumption.
• Adduction
It is the transport of water from the sampling sites to the vicinity of the distribution area.
• Accumulation
The accumulation is to fill reservoirs to ensure on one hand a greater regularity of flow captured, treated and fed,
and in the other hand a guaranteeing of supply during temporary unavailability of previous works.
• Distribution
Distribution is to provide users at each moment with the flows they need. It requires a network of upsized pipes for
the maximum flow, likely to go through at each point.
Each subsystem can be decomposed into subsystems and components.
7. Conclusion
The systemic approach is not a new revolutionary method, replacing the traditional approaches, but a comprehensive
approach integrating and structuring them, based on feedbacks.
The proposed approach to the urban cluster network of Tlemcen is very effective for new needs, while leveraging
existing infrastructure. It is beneficial in this study because it allowed us the decomposition of the system and the
understanding of the way it works; this will allow us to analyze all the related processes. This approach of the
integrating system of water supply of urban cluster of Tlemcen of globalizing nature allows a vision relevant to the
objective of the designer and operator by modelling the overall behaviour of the system in its environment.