3.6.3 Adjusting coefficient schema watering and irrigation design selected coefficient
To determine the change of the regime of irrigation water to synthesize coefficients of watering irrigation for crops over time. It denotes the coefficient irrigated with a graph that charts and diagrams called coefficient of irrigation.
From the calculation results with time irrigate coefficient (q ~ t), was calculated at £ 3:11 we build irrigation scheme as Figure 3.1 coefficient and called schema coefficient preliminary watering.
Looking at the diagram we see irrigation coefficients:
- Coefficient smallest irrigation Qmin = 0,33l / s-ha, Irrigation biggest factor Qmax = 1.1 l / s-ha and the difference between Qmin and Qmax does not satisfy the condition of uniformity (≥ Qmin 0,4qmax).
- Schematic coefficient preliminary irrigation also many seats estate reasonable as sometimes the crops are irrigated in the same time making the coefficient of irrigation to increase, but with time irrigate smaller coefficient or stay for a short time. This will cause many difficulties for the design and management channel.
Therefore irrigation scheme preliminary coefficient must be adjusted in order to reduce the irrational phenomena mentioned above.
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