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19
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EXAMPLE:
let's assume that the specific valve was irrigated 3 days ago. The
evaporation of the last 3 days was 1.2, 1.3 and 0.8 mm which results in a total of
1.2+1.3+0.8= 3.3 mm. let’s assume that the area covered by the valve equals 50
Dunam (50,000 m
2
), therefore the amount of evaporated water is 3.3 x 50 = 165 m
3
.
If the crop factor is 80 % the amount to be irrigated is 165 x 0.8 = 132 m
3
. If the
irrigation has to be done in 2 cycles, each cycle will irrigate 132/2 = 66 m
3
.
The system offers the option of dosage by “
Evaporation time”
which uses actually
the same calculation method explained above but the final result is converted into
time units by dividing the volumetric result with the nominal flow of the valve. The
irrigation will be by time.
2.3.2
Dosage by Volume Per Area
For those who are used to think about irrigation quantities in terms of volume of
water per a unit of area, the DREAM offers the option of dosing the water by
volume/ area. The units, by which the volume and the area are measured, can be
selected at the
DEALERS DEFINITION
. The system calculates the amount of water
to be irrigated by multiplying the user’s request with the predefined data of the area
covered by the valve and multiplied by the crop factor in % as explained above.
Notice that :
When irrigating by evaporation there is no planned value to be inserted, and
when working by m3/area the planned value actually contains the planned
amount per area and not the total amount to be irrigated. However, in both
cases, the total amount to be irrigated will appear as a calculated value.
The desired
volume per area
The calculated
amount to be
irrigated
