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Publisher / Managing Editor
Françoise THUILLIER
Tél.: 33.(0)4.42.92.00.06
Fax: 33.(0)4.42.92.17.80 info@irrigazette.com
Published by E.U.R.L. IRRIGAZETTE
Capital of 50000F
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Pumping, Electric Connections and Installing a System
PUMPING
When setting up a pumping system, two options are possible:
• set up a surface installation system,
• drill a borehole for underground pumping.
In both cases, you are strongly advised to install a reserve of water (tank), if there isn’t one already.
On the other hand, a filtration system should be installed in order to get rid of any particles in the water or which could block the irrigation system. It could be installed after the pump or after the water tank. They will vary according to the quantity of particles to be removed from the water.
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Surface water
When installing a system for pumping surface water (pond, river…), you will need to know:
• the high level (in winter) and the low level (dry seasons) of the source,
• the flow-rate in the case of a river,
• or the volume of a reserve (lake, pond),
• the nature of the water (sandy or otherwise, containing many particles…).
Water extracted from a borehole or well
After having drilled the borehole and before installing the pluming system, you will need to know the following information:
• the flow rate of the system (m3/h).
• The depth of the borehole.
• Its internal diameter.
• The static water level (the water level in the borehole when it is inactive).
• The dynamic water level (groundwater level when the pump is in operation).
• The nature of the water being pumped.
Filters
Water with a high particle content can quickly block the irrigation system and the water distribution systems, where the diameters are generally quite small.
Different types of filters:
• screen or disk membrane filters. The water passes through a filtering element ((fine gauze or very fine membranes) stopping the flow of particles in suspension.
• Gravel or sand (media) filters. The water passes through a layer of calibrated course sand (3 to 8 mm).
The choice of filter type depends on the source and intended use of the water. The filter size is linked to the flow rate of the installation.
For example, for water supplied to the drippers, the filtration mesh size must be 100 to 120 microns, whereas it will be 250 to 300 microns for the diffusers. |
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