The image above represents structure capacity.

To compute for structure capacity, three essential parameters are needed and these parameters are **Entrance Factor (C), Crest Length (L)** and** Depth of Flow (H).**

The formula for calculating the structure capacity:

Q = CLH^{1.5}

Where:

Q = Structure Capacity

C = Entrance Factor

L = Crest Length

H = Depth of Flow

Let’s solve an example;

Find the structure capacity when the entrance factor is 6, the crest length is 10 and the depth of flow is 12.

This implies that;

C = Entrance Factor = 6

L = Crest Length = 10

H = Depth of Flow = 12

Q = CLH^{1.5}

Q = (6)(10)(12)^{1.5}

Q = (6)(10)(41.56)

Q = 2494.15

Therefore, the **structure capacity** is **2494.15.**

**Calculating the Entrance Factor when the Structure Capacity, the Crest Length and the Depth of Flow is Given.**

C = ^{Q} / _{LH1.5}

Where;

C = Entrance Factor

Q = Structure Capacity

L = Crest Length

H = Depth of Flow

Let’s solve an example;

Find the entrance factor when the structure capacity is 20, the crest length is 8 and the depth of flow is 4.

This implies that;

Q = Structure Capacity = 20

L = Crest Length = 8

H = Depth of Flow = 4

C = ^{Q} / _{LH1.5}

C = ^{20} / _{(8)(8)}

C = ^{20} / _{64}

C = 0.3125

Therefore, the **entrance factor **is **0.3125.**

**Calculating the Crest Length when the Structure Capacity, the Entrance Factor and the Depth of Flow is Given.**

L = ^{Q} / _{CH1.5}

Where;

L = Crest Length

C = Entrance Factor

Q = Structure Capacity

H = Depth of Flow

Let’s solve an example;

Find the crest length when the entrance factor is 10, the structure capacity is 30 and the depth of flow is 2.

This implies that;

C = Entrance Factor = 10

Q = Structure Capacity = 30

H = Depth of Flow = 2

L = ^{Q} / _{CH1.5}

L = ^{30} / _{(10)(21.5)}

L = ^{30} / _{(10)(2.82)}

L = ^{30} / _{28.2}

L = 1.06

Therefore, the **crest length **is **1.06.**

**Calculating the Depth of Flow when the Structure Capacity, the Entrance Factor and the Crest Length is Given.**

H = ^{1.5}√^{Q} / _{CL}

Where;

H = Depth of Flow

L = Crest Length

C = Entrance Factor

Q = Structure Capacity

Let’s solve an example;

Find the depth of flow when the structure capacity is 24, the entrance factor is 12 and the crest length is 10.

This implies that;

L = Crest Length = 10

C = Entrance Factor = 12

Q = Structure Capacity = 24

H = ^{1.5}√^{Q} / _{CL}

H = ^{1.5}√^{24} / _{(12)(10)}

H = ^{1.5}√^{24} / _{120}

H = ^{1.5}√0.2

H = 0.34

Therefore, the **depth of flow **is **0.34.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the structure capacity.

To get the answer and workings of the structure capacity using 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 1,500 **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 **Water Budget **under **Agricultural**

Now, Click on **Structure Capacity**** **under **Water Budget**

The screenshot below displays the page or activity to enter your values, to get the answer for the structure capacity according to the respective parameters which are the **Entrance Factor (C), Crest Length (L)** and** Depth of Flow (H).**

Now, enter the values appropriately and accordingly for the parameters as required by the **Entrance Factor (C)** is **6**,** Crest Length (L)** is **10 **and** Depth of Flow (H)** is **12**.

Finally, Click on Calculate

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