Field water distribution
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Field water distribution. Field Water Management – General Principles. Dividing and distributing the flows in manageable proportions Preventing spate water rapidly disappearing in low-lying areas – spreading the water around Ensuring large enough water volumes to reach the downstream areas.

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Field water distribution

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Field water distribution

Field water distribution


Field water management general principles

Field Water Management – General Principles

  • Dividing and distributing the flows in manageable proportions

  • Preventing spate water rapidly disappearing in low-lying areas – spreading the water around

  • Ensuring large enough water volumes to reach the downstream areas

What is important


Field water distribution

Dividing and distributing the flow

within the command area:three systems

Water spreading

Field to field

Controlled


Water spreading through guide bunds

Water spreading through guide bunds

This occurs in new,

relatively small spate

systems

Considerable water

is lost in this

spreading system

No soil development

Water is spread through the

command area using guide bunds


Field water distribution

Field to field irrigation


To avoid erosion in field to field systems

To avoid erosion in field to field systems…

  • Field gates:

  • controlled flow

  • relatively costly

  • but useful


Field water distribution

Yet very hard to handle floods otherwise


Field water distribution

Controlled systems –

each field having its own intake

Controlled systems are sometimes

considered more efficient than field-to-field.

Assessment of field

Irrigation efficiency

need to be qualified:

Water stored in deeper

layers moves up as

temperatures go down

in the winter – providing

moisture to maturing crop

Yet this needs to be looked at again –

In controlled systems as common in

Pakistan the fields are usually large

(5 ha) and uneven. To store 200 mm in

the soil profile may require 1 meter of

water to be applied.


Field water distribution

HIGH WATER APPLICATION PER TURN


Comparing field to field and controlled systems

Comparing field to field and controlled systems


Field water distribution

Priority 1:Preventing spate water from quickly disappearing to low-lying areas before it has spread all over the command areaPriority 2:Avoiding gullying of channels and fields as this will ‘pull down’ soil moisture


Field water distribution

Importance of gully plugging

Plugging this gully (that

developed after a major flood)

avoided that floods quickly

disappeared from this area and

that soils dried out quickly


Drop structure

Drop structure

Farmer-built drop structures


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