The term "Delta" used for irrigation practice can be expressed as................. (A). cm (B). cm/hr (C). Poise (D). Lux Choose the correct answer from the options given below:
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Remember the classic relationship between Duty ($D$, in hectares/cumec), Delta ($\Delta$, in meters), and Base Period ($B$, in days):
\[ \Delta = \frac{8.64 \cdot B}{D} \]
This relationship helps calculate the total water depth needed for irrigation planning.