The image above represents average inflow rate.

To compute for average inflow rate, three essential parameters are needed and these parameters are **Average outflow rate (O), Change in storage during routing time (Δs)** and **Routing Time (Δt).**

The formula for calculating average inflow rate:

I = O + ^{Δs} / _{Δt}

Where:

I = Average Inflow Rate

O = Average Outflow Rate

Δs = Change in Storage during Routing Time

Δt = Routing Time

Let’s solve an example;

Find the Average Inflow Rate when the average outflow rate is 10, the change in storage during routing time is 5 and the routing time is 12.

This implies that;

O = Average Outflow Rate = 10

Δs = Change in Storage during Routing Time = 5

Δt = Routing Time = 12

I = O + ^{Δs} / _{Δt}

I = 10 + ^{5} / _{12}

I = 10 + 0.416

I = 10.416

Therefore, the **average inflow rate **is **10.416.**

**Calculating the Average Outflow Rate when the Average Inflow Rate, the Change in Storage during Routing Time and the Routing Time is Given.**

O = I – ^{Δs} / _{Δt}

Where;

O = Average Outflow Rate

I = Average Inflow Rate

Δs = Change in Storage during Routing Time

Δt = Routing Time

Let’s solve an example;

Find the Average Outflow Rate when the average inflow rate is 50, change in storage during routing time is 20 and the routing time is 10.

This implies that;

I = Average Inflow Rate = 50

Δs = Change in Storage during Routing Time =20

Δt = Routing Time = 10

O = I – ^{Δs} / _{Δt}

O = 50 – ^{20} / _{10}

O = 50 – 2

O = 48

Therefore, the **average outflow rate **is **48.**

**Calculating the Change in Storage during Routing Time when the Average Inflow Rate, the Average Outflow Rate and the Routing Time is Given.**

Δs = (I – O) Δt

Where;

Δs = Change in Storage during Routing Time

I = Average Inflow Rate

O = Average Outflow Rate

Δt = Routing Time

Let’s solve an example;

Find the change in storage during routing time when the average inflow rate is 25, the average outflow rate is 15 and the routing time is 30.

This implies that;

I = Average Inflow Rate = 25

O = Average Outflow Rate = 15

Δt = Routing Time = 30

Δs = (I – O) Δt

Δs = (25 – 15) 30

Δs = (10) 30

Δs = 300

Therefore, the **change in storage during routing time **is **300.**

**Calculating for Routing Time when the Average Inflow Rate, the Average Outflow Rate and the Change in Storage During Routing Time is Given.**

Δt = ^{Δs} / _{(I – O)}

Where;

Δt = Routing Time

I = Average Inflow Rate

O = Average Outflow Rate

Δs = Change in Storage during Routing Time

Let’s solve an example;

Find the routing time when the average inflow rate is 25, the average outflow rate is 15 and the change in storage during routing time is 30.

This implies that;

I = Average Inflow Rate = 25

O = Average Outflow Rate = 15

Δs = Change in Storage during Routing Time = 30

Δt = ^{Δs} / _{(I – O)}

Δt = ^{30} / _{(25 – 15)}

Δt = ^{30} / _{(10)}

Δt = 3

Therefore, the **routing time **is **3.**

Nickzom Calculator – **The Calculator Encyclopedia** is capable of calculating the average inflow rate.

To get the answer and workings of the average inflow rate 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 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 **Hydrology II **under **Agricultural**

Now, Click on **Average Inflow Rate **under **Hydrology II**

The screenshot below displays the page or activity to enter your values, to get the answer for the average inflow rate according to the respective parameters which is the **Average outflow rate (O), Change in storage during routing time (Δs)** and **Routing Time (Δt).**

Now, enter the values appropriately and accordingly for the parameters as required by the **Average outflow rate (O)** is **10**,** Change in storage during routing time (Δs)** is **5 **and **Rou****ting Time (Δt)** is **12**.

Finally. Click on Calculate

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