The image above represents water convergence efficiency.

To compute for water convergence efficiency, two essential parameters are needed and these parameters are **Water delivered to the Irrigated Plot (w _{f}) **and

**Water delivered from the Source (w**

_{d}).The formula for calculating water convergence efficiency:

E_{c} = ^{100 . wf} / _{w}_{d}

Where:

E_{c} = Water Convergence Efficiency

w_{f} = Water delivered to the Irrigated Plot

w_{d} = Water delivered from the Source

Let’s solve an example;

Find the water convergence efficiency when the water delivered to the irrigated plot is 30 and the water delievered from the source is 10.

This implies that;

w_{f} = Water delivered to the Irrigated Plot = 30

w_{d} = Water delivered from the Source = 10

E_{c} = ^{100 . wf} / _{wd}

E_{c} = ^{100 . (30)} / _{10}

E_{c} = ^{3000} / _{10}

E_{c} = 300

Therefore, the **water convergence efficiency **is **300%.**

**Calculating the Water Delivered to the Irrigated Plot when the Water Convergence Efficiency and the Water Delivered from the Source is Given.**

w_{f} = ^{Ec x wd} / _{100}

Where;

w_{f} = Water delivered to the Irrigated Plot

E_{c} = Water Convergence Efficiency

w_{d} = Water delivered from the Source

Let’s solve an example;

Find the water delivered to the irrigated plot when the water convergence efficiency is 20 and the water delivered from the source is 5.

This implies that;

E_{c} = Water Convergence Efficiency = 20

w_{d} = Water delivered from the Source = 5

w_{f} = ^{Ec x wd} / _{100}

w_{f} = ^{20 x 5} / _{100}

w_{f} = ^{100} / _{100}

w_{f} = 1

Therefore, the **water delivered to the irrigated plot **is **1%.**