How to Calculate and Solve for Storage Difference | Irrigation Water Requirement

If you want to calculate the storage difference, six essential parameters are needed, and these parameters are Precipitation (P), Irrigation (I), Runoff from the Field (R), Downward Drainage out of the Root Zone (D), Evaporation from the Soil (E) and Transpiration by Crop Canopy (T).

The formula for calculating storage difference:

SD = (P + I) – (R + D + E + T)

Where:

SD = Storage Difference
P = Precipitation
I = Irrigation
R = Runoff from the Field
D = Downward Drainage out of the Root Zone
E = Evaporation from the Soil
T = Transpiration by Crop Canopy

Let’s solve an example;
Find the storage difference when the precipitation is 21, the irrigation is 5, the runoff from the field is 10, the downward drainage out of the root zone is 14, the evapotranspiration from the soil is 8 and the transpiration by crop canopy is 20.

This implies that;

P = Precipitation = 21
I = Irrigation = 5
R = Runoff from the Field = 10
D = Downward Drainage out of the Root Zone = 14
E = Evaporation from the Soil = 8
T = Transpiration by Crop Canopy = 20

SD = (P + I) – (R + D + E + T)
SD = (21 + 5) – (10 + 14 + 8 + 24)
That is, SD = 26 – 56
SD = -30

Therefore, the storage difference is -30.

Read more: How to Calculate and Solve for Total Load on Flexible Pipe | Irrigation Water Requirement

How to Calculate Storage Difference With Nickzom Calculator

Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the storage difference.

To get the answer and workings of the storage difference, 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 Storage Difference under Irrigation Water Requirement

The screenshot below displays the page or activity to enter your values, to get the answer for the storage difference according to the respective parameters which is the Precipitation (P), Irrigation (I), Runoff from the Field (R), Downward Drainage out of the Root Zone (D), Evapouration from the Soil (E) and Transpiration by Crop Canopy (T).

Now, enter the values appropriately and accordingly for the parameters as required by the Precipitation (P) is 21, Irrigation (I) is 5, Runoff from the Field (R) is 10, Downward Drainage out of the Root Zone (D) is 14, Evapouration from the Soil (E) is 8 and Transpiration by Crop Canopy (T) is 20.

Finally, Click on Calculate

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