Concept: Full Supply Coefficient: It is defined as the area estimated to be irrigated during the base period divided by the design full supply discharge of the channel at its head during maximum demand. This is also known as duty on capacity.
Nominal Duty:
In some states, cultivators have to submit an application for water required for their land under irrigation, to the department in advance of every season. After a permit is granted, they have to pay the full amount for the water irrespective of the area they actually irrigated. Nominal duty is, therefore, the ratio of the area of which the permit has been granted for the period divided by the mean supply of the base period.
Root zone depth:
Root zone depth is the maximum depth of the soil strata in which the crop spreads its roots system and derives water from the soil.
Capacity Factor:
It is the ratio between the mean supply and the full supply of the canal.