# Sediment Flows

## **Overview**

The Sediment Flows Erosion filter offers a highly adjustable particle-based erosion and thinking of it as a simulation running many individual droplets is key to understanding all of its properties.\
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The filter simulates a water droplet with a set amount of water that influences its carrying capacity and ability to erode the terrain. The droplet moves downwards at a constant rate, eroding and depositing sediment in its path.\
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Compared to the Thin Flows and Wide Flows erosion it has improved velocity handling, leading to better slippage and sedimentation at the bottom of eroded areas. Additionally it also offers easier options with settings like Downcutting or Shape Protection.

## **Parameters**

<table><thead><tr><th width="199.7999267578125">Property</th><th>Description</th></tr></thead><tbody><tr><td><strong>Seed</strong></td><td>Changes the seed for the rain droplet distribution and other parameters used in the simulation.</td></tr></tbody></table>

### Rain

<table><thead><tr><th width="199.7999267578125">Property</th><th>Description</th></tr></thead><tbody><tr><td><strong>Rain Map</strong></td><td>Allows you to specify a mask to control where rain drops are spawned.</td></tr><tr><td><strong>Rain Strength</strong></td><td>This lets you adjust the amount of droplets spawned on the terrain. You can also further modify the rain strengths on each level step in the level step editor below the slider. The level step that a droplet runs on heavily impacts the structures the filter will produce. Lower levels generate wider crevices and sedimentation, while higher levels create more intricate details.</td></tr></tbody></table>

### General

<table><thead><tr><th width="179.699951171875">Property</th><th>Description</th></tr></thead><tbody><tr><td><strong>Peaks</strong></td><td>Distributes the droplet spawning over several passes. This leads to the erosion covering a larger area and subsequently more peaks in the finished terrain.</td></tr><tr><td><strong>Initial Water</strong></td><td>Sets the amount of water a droplet has when it is spawned. The water influences its maximum lifetime and the amount of sediment it can carry.</td></tr><tr><td><strong>Friction</strong></td><td>Controls how much velocity the droplets lose during the simulation. A higher friction results in more reactive droplets that better curve to the fine details of the terrain.</td></tr><tr><td><strong>Shape Protection</strong></td><td>Tries to preserve the original shape of the terrain by restricting the maximum amount that can be eroded.</td></tr></tbody></table>

### Sediment Transport

<table><thead><tr><th width="199.7999267578125">Property</th><th>Description</th></tr></thead><tbody><tr><td><strong>Transport Rate</strong></td><td>Modifies the amount of sediment a droplet can carry.</td></tr><tr><td><strong>Downcutting</strong></td><td>Controls the depth of streams (where many droplets run through).</td></tr><tr><td><strong>Sediment Loss</strong></td><td>This describes a constant percentage of sediment that a droplet will lose in every movement step it takes.</td></tr><tr><td><strong>Sediment Smoothing</strong></td><td>Widens streams (where many droplets pass through).</td></tr><tr><td><strong>Deposition Multiplier</strong></td><td>A factor that affects the final amount of sediment deposited onto the terrain. Any other value than 1 can disturb the equilibrium of the filter and add/remove matter from the terrain.</td></tr></tbody></table>

### Flow Modification

<table><thead><tr><th width="199.7999267578125">Property</th><th>Description</th></tr></thead><tbody><tr><td><strong>Flow Rotation</strong></td><td>Alters the starting direction of a particle.</td></tr><tr><td><strong>Random Rotation</strong></td><td>Normally, a droplet will have a downslope path when spawned. Increasing this value will randomize it.</td></tr><tr><td><strong>Wind Direction</strong></td><td>Allows you to set a wind direction, which will influence a particle's movement direction.</td></tr><tr><td><strong>Wind Strength</strong></td><td>Controls how strongly droplets will be affected by the wind.</td></tr></tbody></table>

## **Results**

<div><figure><img src="/files/lSdF19soUDXatAcc8pWQ" alt=""><figcaption></figcaption></figure> <figure><img src="/files/346W4MRxY9Cg7kkP8uqf" alt=""><figcaption></figcaption></figure> <figure><img src="/files/I5UcJFdXX77mNaxXuEnV" alt=""><figcaption></figcaption></figure></div>


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