---
title: Inputting Catchment
description: "Catchment properties can be input in the Spread Input. Users have to click on “**Catchment**” before inputting the catchment properties. ![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/CATCHMENT-BUTTON.png?resize=1080%2C179&ssl=1) # **Import Catchment** Under the Catchment section, click on the “**Import Catchment**” and select the layer that represents your…"
url: "https://mes100.com/docs/inputting-catchment/"
updated: "2025-11-28"
category: "Storm Sync (Drain & Pond) / Input / Inflow Source"
---

# Inputting Catchment

Catchment properties can be input in the Spread Input. Users have to click on “**Catchment**” before inputting the catchment properties.

![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/CATCHMENT-BUTTON.png?resize=1080%2C179&ssl=1)

# **Import Catchment**

Under the Catchment section, click on the “**Import Catchment**” and select the layer that represents your catchment and click “**Import**”.

![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/import-catchment.png?resize=1024%2C185&ssl=1)

# **MISC**

Users can input the catchment properties in the Misc tab by selecting the particular catchment.

![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/image45-1.png?resize=1024%2C538&ssl=1)

# **Spread Input**

It is easier for users to input the catchment properties by clicking the “**Spread Input**”.

![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/image17-1.png?resize=1024%2C545&ssl=1)

## **Drain**

Represents the drain into which the catchment’s runoff will flow, represented by the arrow on the Input Plan.

![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/image42-1.png?resize=1024%2C536&ssl=1)

## **Area**

Represents the area of the catchment, which can be computed by software based on the closed polygon drawn or user-defined by users.

To define your own area, users need to change the **User Defined column** from **NO to YES**.

![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/image9-3.png?resize=1024%2C550&ssl=1)

## **Runoff Coefficient**

Calling out the Runoff Coefficient table, users can click on the ‘...’ button.

Then, users can click the coefficient value to apply it to the catchment.

![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/image50.png?resize=1024%2C550&ssl=1)

## **Overland Flow**

Users can let the software compute the Overland Flow time by defining the **Slope** and **Roughness**.

These values can be input directly under the respective columns, or users can call out the overland dialog by clicking the ‘...’ button.

![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/image3-6.png?resize=1024%2C541&ssl=1)

# **How to remove/add a vertex and move a corner **

## **Remove/Add Vertex**

Click on ‘**Catchment**’, then click “**Add/Remove Vertex**”.

![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/image6-3.png?resize=1080%2C567&ssl=1)

To remove the vertex, select the catchment’s vertex. Then, hover the vertex and click-once to remove it.

![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/image32.gif?resize=426%2C240&ssl=1)

To add a vertex, click on the catchment’s edge once and click again to add vertex.

![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/image12.gif?resize=426%2C240&ssl=1)

## **Move Corner**

Click on “**Move Corner**”, then select the corner and click once again to move it (Until the snap cursor is showing).

![](https://i0.wp.com/mes100.com/wp-content/uploads/2022/09/image16.gif?resize=426%2C240&ssl=1)

### *Related*

 [![](https://i0.wp.com/mes100.com/wp-content/uploads/2024/10/me-small.jpg?resize=100%2C100&ssl=1)](https://mes100.com/author/admin/)[Ngu Soon Hui](https://mes100.com/author/admin/)

I’m the [Benevolent Dictator for Life](https://en.wikipedia.org/wiki/Benevolent_dictator_for_life) for MiTS Software cum Editor of this website. Read more [here](/about-ngu-soon-hui/).

You can also contact me at soonhui@mes100.com