5 Water Supply Challenges and Achievements in Constanta County
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For now, the only way to improve efficiency is to rehabilitate the existing infrastructure that means pumping stations, transmission ducts, canals, watering networks
and all this action has to be conducted according to a previous total analysis of the
hydraulic system. The dimensioning of each element in the hydraulic system depend
upon the effective combination of the system’s components: water source, intake
structure, reservoir, pumps, pipeline, etc. It is more difficult for an engineer to conform to the restrictions imposed by rehabilitation of an old facility when he has to
upgrade the installation by replacing only part of it than to plan and design a new
one.
Many old pumping stations were oversized from the very beginning when speaking about pumping heads and discharges. Furthermore, pumps operated at constant
speed, so the discharge could be adjusted only by combining different pumps to
operate in parallel or to partly close the valve on the discharge duct.
The construction and installation costs for an irrigation facility are high. Besides,
its operation relies on large amounts of electricity which is expensive. Therefore, it
is imperative that the pumps degree of efficiency be high.
The optimal engineering design, construction, and operation of a high-yield irrigation water system depend on:
• careful estimation of the pumps maximal head as a key factor in pump selection;
• expert design, based on hydraulic analysis and numerical simulation;
• use of variable frequency drives for better pressure regulation and for efficiently
matching the pump discharge to water demand;
• monitoring and control equipment used in pumping installations;
• water transport canals insulation;
• proper operation and maintenance;
• well-qualified personnel.
All these goals involve large investments. Therefore it is difficult to achieve them
simultaneously. However, the on-going national programme envisages bringing the
new technology in the existing irrigation infrastructure in Dobrogea, on stages.
The importance of the numerical simulation of a water supply system operation
in engineering design is pointed out below in two study cases.
5.4 Numerical Simulation–Fundamental for Water Supply
System Engineering Design
The numerical simulation is a useful tool in a decision-making process, concerning
technical solutions. It is widely used to assess the hydrological state of the surface
water, groundwater, and soil water in the area of interest and to find flood protection
solution or a water source for the revitalization of some old dry river bed [26].
Referring to urban and rural water facilities, a reliable and technically sound option
may be achieved after a rigorous analysis of different possible configurations and
engineering design solutions, made in the first stage of planning. Moreover, the
187
For now, the only way to improve efficiency is to rehabilitate the existing infrastructure that means pumping stations, transmission ducts, canals, watering networks
and all this action has to be conducted according to a previous total analysis of the
hydraulic system. The dimensioning of each element in the hydraulic system depend
upon the effective combination of the system’s components: water source, intake
structure, reservoir, pumps, pipeline, etc. It is more difficult for an engineer to conform to the restrictions imposed by rehabilitation of an old facility when he has to
upgrade the installation by replacing only part of it than to plan and design a new
one.
Many old pumping stations were oversized from the very beginning when speaking about pumping heads and discharges. Furthermore, pumps operated at constant
speed, so the discharge could be adjusted only by combining different pumps to
operate in parallel or to partly close the valve on the discharge duct.
The construction and installation costs for an irrigation facility are high. Besides,
its operation relies on large amounts of electricity which is expensive. Therefore, it
is imperative that the pumps degree of efficiency be high.
The optimal engineering design, construction, and operation of a high-yield irrigation water system depend on:
• careful estimation of the pumps maximal head as a key factor in pump selection;
• expert design, based on hydraulic analysis and numerical simulation;
• use of variable frequency drives for better pressure regulation and for efficiently
matching the pump discharge to water demand;
• monitoring and control equipment used in pumping installations;
• water transport canals insulation;
• proper operation and maintenance;
• well-qualified personnel.
All these goals involve large investments. Therefore it is difficult to achieve them
simultaneously. However, the on-going national programme envisages bringing the
new technology in the existing irrigation infrastructure in Dobrogea, on stages.
The importance of the numerical simulation of a water supply system operation
in engineering design is pointed out below in two study cases.
5.4 Numerical Simulation–Fundamental for Water Supply
System Engineering Design
The numerical simulation is a useful tool in a decision-making process, concerning
technical solutions. It is widely used to assess the hydrological state of the surface
water, groundwater, and soil water in the area of interest and to find flood protection
solution or a water source for the revitalization of some old dry river bed [26].
Referring to urban and rural water facilities, a reliable and technically sound option
may be achieved after a rigorous analysis of different possible configurations and
engineering design solutions, made in the first stage of planning. Moreover, the