# Water Input

Water input nodes are the mechanism by which water can be entered into the system. Here, we introduce the three most commonly used nodes for water input.

{% content-ref url="water-input/input-node" %}
[input-node](https://water-strategy.gitbook.io/waterstrategy/modeling-basics/node-types/water-input/input-node)
{% endcontent-ref %}

{% content-ref url="water-input/catchment-node" %}
[catchment-node](https://water-strategy.gitbook.io/waterstrategy/modeling-basics/node-types/water-input/catchment-node)
{% endcontent-ref %}

{% content-ref url="water-input/proportional-input-node" %}
[proportional-input-node](https://water-strategy.gitbook.io/waterstrategy/modeling-basics/node-types/water-input/proportional-input-node)
{% endcontent-ref %}