It’s been a while since the last time I write an article about utility system. In this post I want to share you how to calculate **cooling tower makeup water**.

Cooling tower must be made up because the water level decrease by the time during operation. There are aspect that contribute to calculation of cooling tower makeup water. Those are:

- Evaporation loss
- Drift loss
- Blow down

Total cooling water makeup water requirement = evaporation loss + drift loss + blow down.

Let’s take a look one by one how to calculate each component.

**Evaporation Loss**

Evaporation loss is loss of water due to evaporation. It is calculated by this equation:

**Evaporation loss = 0.00085 Wc (T _{1}-T_{2})**