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

October 2, 2020April 21, 2024 Loveth Idoko

Last Updated on April 21, 2024

The image above represents the consumptive irrigation requirement. To calculate the consumptive irrigation requirement, two essential parameters are needed, and these parameters are Consumptive Use (CU) and Effective Rainfall (ER).

The formula for calculating the consumptive irrigation requirement:

CR = CU – ER

Where:

CR = Consumptive Irrigation Requirement
CU = Consumptive Use
ER = Effective Rainfall

Let’s solve an example;
Find the consumptive irrigation requirement when the consumptive use is 10 and the effective rainfall is 2.

This implies that;

CU = Consumptive Use = 10
ER = Effective Rainfall = 2

CR = CU – ER
So, CR = 10 – 2
CR = 8

Therefore, the consumptive irrigation requirement is 8.

Calculating the Consumptive Use when the Consumptive Irrigation Requirement and the Effective Rainfall are Given

CU = CR + ER

Where;

CU = Consumptive Use
CR = Consumptive Irrigation Requirement
ER = Effective Rainfall

Let’s solve an example;
Find the consumptive use when the consumptive irrigation requirement is 20 and the effective rainfall is 8.

This implies that;

CR = Consumptive Irrigation Requirement = 20
ER = Effective Rainfall = 8

That is, CU = CR + ER
CU = 20 + 8
CU = 28

Therefore, the consumptive use is 28.

Calculating the Effective Rainfall when the Consumptive Irrigation Requirement and the Consumptive Use are Given

ER = CU – CR

Where;

ER = Effective Rainfall
CR = Consumptive Irrigation Requirement
CU = Consumptive Use

Let’s solve an example;
Find the effective rainfall when the consumptive irrigation requirement is 12 and the consumptive use is 14.

This implies that;

CR = Consumptive Irrigation Requirement = 12
CU = Consumptive Use = 14

Then, ER = CU – CR
ER = 14 – 12
ER = 2

Therefore, the effective rainfall is 2.

How to Calculate Consumptive Irrigation Requirement Using Nickzom Calculator

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

To get the answer and workings of the consumptive 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 Consumptive Irrigation Requirement under Irrigation Water Requirement

The screenshot below displays the page or activity to enter your values, to get the answer for the consumptive irrigation requirement according to the respective parameters which is the Consumptive Use (CU) and Effective Rainfall (ER).

Now, enter the values appropriately and accordingly for the parameters as required by the Consumptive Use (CU) is 10 and Effective Rainfall (ER) is 2.

Finally, Click on Calculate

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