Natural Water Sources

Water storage pond for irrigation

With water from the public mains becoming increasingly expensive, supplying irrigation from natural sources of water, such as bore holes, wells, rivers and lakes makes sense, especially if you will be using large quantities.

Access supply a range of pumps, filters and irrigation systems to enable you to make use of any natural sources of water nearby, saving you money and helping to conserve mains water.

Using natural water sources

Although free at the point of use, abstracting water from underground or from streams will require regulatory approval if extraction exceeds 20m³ per day. You will generally need to pass abstracted water through a filtration system to remove any suspended particles. Water from natural sources may also require treatment if it has high levels of iron or calcium.

Natural water filtration

For water with high iron content, Access can supply iron removal systems. Oxidising agents such as sodium hypochlorite are added to the water, which is then passed through a high capacity filter to remove the sediment.

If you're drawing water up through chalk strata or from chalk streams, you may also need to alter the pH of the water supply. To achieve this, Access can install acid dosing rigs to inject nitric acid into the water stream.

If you're using water drawn directly from rivers or lakes, you will need filters with high capacities to remove the higher levels of sediment in the water. With Access, you can do this using submersible pumps with built-in filtration, sand filter arrays or self-flushing screen filters. Depending on the microbiological activity present in the water, and the irrigation use, chlorine or UV units may also be required. We will supply and install these for you.

Boreholes

Irrigation water from boreholes is generally supplied using narrow diameter borehole pumps inserted into the borehole. Depending on the irrigation flows required, you can either connect the irrigation system directly onto this borehole pump, or you can pump the borehole water into a storage tank with a larger capacity surface mounted pump to operate the irrigation system.

Well water

Depending on the minimum depth of water, irrigation water from wells can either be drawn up using a surface mounted self-priming pump or using a well pump dropped down into the well.

Rivers and lakes

River & lake water can either be drawn into surface mounted pump units mounted at the water's edge, or submersible pumps can be placed in the water. You should locate the inlet point away from the water’s edge and ideally draw the water from just below the surface where it is cleanest. We can supply suction baskets and floating inlets to ensure the water is as clean as possible.

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Printed from http://www.access-irrigation.co.uk/design-services/green-irrigation/natural-water-sources