Watershed Module: Difference between revisions

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{{Template:Watershed Module buttons}}
{{Template:Watershed Module buttons}}
[[File:Watershed_Overlay.png|thumb|right|Watershed overlay showing the calculated watersheds for a rural area. Each watershed is colored uniquely.]]


[[File:Watershed_Overlay.png|thumb|left|Watershed overlay, with each watershed as]]
The watershed module calculates the result for the following question:
The watershed module provides the solution for the following question:
''I want to know into which waterway a set of rain drops will end up based on the terrain elevation and the starting location of the drops.''
''I want to know into which waterway a set of rain drops will end up based on the terrain elevation and the starting location of the drops.''  
The locations of the drops that all end up in the same waterway can be grouped together to form a region called the '''watershed'''.  
The locations of the drops that all end up in the same waterway can be grouped together to form a region called the watershed.  


Historically, the calculation of watersheds was mostly done based on the gradient of the terrain. However, when the terrain is near flat, it is not known where the rain water will flow and the direction will be assigned arbitrarily based on the used algorithm. Secondly, the terrain often contains many local minimas, which results in the creation of too many unique watersheds (oversegmentation). To solve this, one would often apply filters on the terrain to remove these local minimas, but this required a lot of user judgement.
===Watersheds applications===
Watersheds can be used for the following:
* A client wants to know which waterways are the largest and therefore most important in his water system. This way, the client can manage maintenance and adjustments more appropriately.
* A client wants to validate its water system and find out if all major rainfall catchment areas are connected to the water system. For example, a client finds out that a human constructed water body plays a major roll in storing rain fall water but has no connection to the water system to discharge any excess.
* A client can use the watershed, in combination with the waterways this watershed belongs to, in our calculation models outside the {{software}}. For example, by using the watershed as a way to quantify how much rainfall a waterway will receive in grand scale, low detail water system calculations.
* A client has to solve disputes with landowners complaining about (the lack of) rainfall discharge on their land.


Fortunately, instead of using only the gradient of the terrain directly, we can also simulate rainfall using our [[Rainfall (Overlay)]] and use the Average Direction result to have a better idea of where the rain drops will end up based on momentum. Given that the rainfall is sufficiently large, this will remove local minima and solve most issues of unknown flow direction on flat surfaces.
==See also==
* [[Watershed (Overlay)|Watershed overlay]]

Latest revision as of 09:08, 27 July 2020

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Watershed Module
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Overview
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Theory
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Watershed overlay showing the calculated watersheds for a rural area. Each watershed is colored uniquely.

The watershed module calculates the result for the following question: 

I want to know into which waterway a set of rain drops will end up based on the terrain elevation and the starting location of the drops.

The locations of the drops that all end up in the same waterway can be grouped together to form a region called the watershed.

Watersheds applications

Watersheds can be used for the following:

  • A client wants to know which waterways are the largest and therefore most important in his water system. This way, the client can manage maintenance and adjustments more appropriately.
  • A client wants to validate its water system and find out if all major rainfall catchment areas are connected to the water system. For example, a client finds out that a human constructed water body plays a major roll in storing rain fall water but has no connection to the water system to discharge any excess.
  • A client can use the watershed, in combination with the waterways this watershed belongs to, in our calculation models outside the Tygron Platform. For example, by using the watershed as a way to quantify how much rainfall a waterway will receive in grand scale, low detail water system calculations.
  • A client has to solve disputes with landowners complaining about (the lack of) rainfall discharge on their land.

See also

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