How to Calculate and Solve for Discharge | Slope Area Method | Water Budget

The image above represents discharge | slope area method. To calculate discharge | slope area method, four essential parameters are needed and these parameters are Manning’s Co-efficient (N), Area (A), Hydraulic Radius (R) and Slope (S).

The formula for calculating discharge | slope area method:

Q = (A / N) R2/3 S1/2

Where;

Q = Discharge
N = Manning’s Co-efficient
A = Area
R = Hydraulic Radius
S = Slope

Let’s solve an example;
Find the discharge when the manning’s co-efficient is 4, the area is 30, the hydraulic radius is 15 and the slope is 22.

This implies that;

N = Manning’s Co-efficient = 4
A = Area = 30
R = Hydraulic Radius = 15
S = Slope = 22

Q = (A / N) R2/3 S1/2
So, Q = (30 / 4) (15)2/3 (22)1/2
Q = (7.5) (6.08) (4.69)
Q = 213.96

Therefore, the discharge is 213.96.

Read more: How to Calculate and Solve for Structure Capacity | Water Budget

How to Calculate and Solve for Discharge | Slope Area Method  Using Nickzom Calculator

Nickzom Calculator – The Calculator Encyclopedia is capable of calculating the discharge | slope area method.

To get the answer and workings of the discharge | slope area method using the Nickzom Calculator – The Calculator Encyclopedia. First, you need to obtain the app.

You can get this app via any of these means:

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Once, you have obtained the calculator encyclopedia app, proceed to the Calculator Map, then click on Agricultural under Engineering.

Now, Click on Water Budget under Agricultural

Now, Click on Discharge| Slope Area Method under Water Budget

How to Calculate and Solve for Discharge | Slope Area Method | Water Budget

The screenshot below displays the page or activity to enter your values, to get the answer for the discharge | slope area method according to the respective parameters which are the Manning’s Co-efficient (N), Area (A), Hydraulic Radius (R) and Slope (S).

How to Calculate and Solve for Discharge | Slope Area Method | Water Budget

Now, enter the values appropriately and accordingly for the parameters as required by the Manning’s Co-efficient (N) is 4, Area (A) is 30, Hydraulic Radius (R) is 15 and Slope (S) is 22.

How to Calculate and Solve for Discharge | Slope Area Method | Water Budget

Finally, Click on Calculate


As you can see from the screenshot above, Nickzom Calculator– The Calculator Encyclopedia solves for the discharge | slope area method and presents the formula, workings and steps too.

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