How to Calculate and Solve for Gross Irrigation Requirement | Irrigation Water Requirement

The image above represents the gross irrigation requirement. Two essential parameters are needed to calculate gross irrigation requirement: Field Irrigation Requirement (FIR) and Water Conveyance Efficiency (η_c).

The formula for calculating gross irrigation requirement;

GIR = ^FIR / _ηc

Where:

GIR = Gross Irrigation Requirement
FIR = Field Irrigation Requirement
η_c = Water Conveyance Efficiency

Let’s solve an example;
Find the gross irrigation requirement when the field irrigation requirement is 72 and the water conveyance efficiency is 12.

This implies that;

FIR = Field Irrigation Requirement = 72
η_c = Water Conveyance Efficiency = 12

That is, GIR = ^FIR / _ηc
GIR = ⁷² / ₁₂
GIR = 6

Therefore, the gross irrigation requirement is 6.

Calculating the Field Irrigation Requirement when the Gross Irrigation Requirement and the Water Conveyance Efficiency are Given

FIR = GIR x η_c

Where;

FIR = Field Irrigation Requirement
GIR = Gross Irrigation Requirement
η_c = Water Conveyance Efficiency

Let’s solve an example;
Find the field irrigation requirement when the gross irrigation requirement is 10 and the water conveyance efficiency is 14.

This implies that;

GIR = Gross Irrigation Requirement = 10
η_c = Water Conveyance Efficiency = 14

FIR = GIR x η_c
Then, FIR = 10 x 14
FIR = 140

Therefore, the field irrigation requirement is 140.

Read more: How to Calculate and Solve for Consumptive Irrigation Requirement | Irrigation Water Requirement

Calculating the Water Conveyance Efficiency when the Gross Irrigation Requirement and the Field Irrigation Requirement are Given

η_c = ^FIR / _GIR

Where;

η_c = Water Conveyance Efficiency
GIR = Gross Irrigation Requirement
FIR = Field Irrigation Requirement

Let’s solve an example;
Given that the gross irrigation requirement is 5 and the field irrigation requirement is 20. Find the water conveyance efficiency?

This implies that;

GIR = Gross Irrigation Requirement = 5
FIR = Field Irrigation Requirement = 20

η_c = ^FIR / _GIR
So, η_c = ²⁰ / ₅
η_c = 4

Therefore, the water conveyance efficiency is 4.

Read more: How to Calculate and Solve for Net Irrigation Requirement | Irrigation Water Requirement

How to Calculate Gross Irrigation Requirement Using Nickzom Calculator

Nickzom Calculator – The Calculator Encyclopedia can calculate the gross irrigation requirement.

To get the answer and workings of the gross irrigation requirement, use the Nickzom Calculator – The Calculator Encyclopedia. First, you need to obtain the app.

You can get this app via any of these means:

Web – https://www.nickzom.org/calculator-plus

To get access to the professional version via web, you need to register and subscribe for NGN 2,000 per annum to have utter access to all functionalities.
You can also try the demo version via https://www.nickzom.org/calculator

Android (Paid) – https://play.google.com/store/apps/details?id=org.nickzom.nickzomcalculator
Android (Free) – https://play.google.com/store/apps/details?id=com.nickzom.nickzomcalculator
Apple (Paid) – https://itunes.apple.com/us/app/nickzom-calculator/id1331162702?mt=8
Once you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Agricultural under Engineering.

Now, Click on Irrigation Water Requirement under Agricultural

Now, Click on Gross Irrigation Requirement under Irrigation Water Requirement

The screenshot below displays the page or activity to enter your values to get the answer for the gross irrigation requirement according to the respective parameters, which are the Field Irrigation Requirement (FIR) and Water Conveyance Efficiency (ηc).

Now, enter the values appropriately and accordingly for the parameters as required by the Field Irrigation Requirement (FIR) is 72 and Water Conveyance Efficiency (η_c) is 12.

Finally, Click on Calculate

As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves the gross irrigation requirement and presents the formula, workings and steps, too.