Watershed Module overview - Revision history

Frank@tygron.nl at 13:40, 2 February 2024

2024-02-02T13:40:13Z

← Older revision		Revision as of 13:40, 2 February 2024
Line 64:		Line 64:

	==Result Types==		==Result Types==
	* [[~~Watershed~~ result type (Watershed Overlay)\|Watershed]]		* [[Watersheds result type (Watershed Overlay)\|Watershed]]
	* [[Discharge areas result type (Watershed Overlay)\|Discharge areas]]		* [[Discharge areas result type (Watershed Overlay)\|Discharge areas]]
	* [[Direction result type (Watershed Overlay)\|Direction]]		* [[Direction result type (Watershed Overlay)\|Direction]]

Rudolf@tygron.nl: Rudolf@tygron.nl moved page Watershed module overview to Watershed Module overview: Capitalization consistency for navigational tempates

2020-12-14T12:33:30Z

Rudolf@tygron.nl moved page Watershed module overview to Watershed Module overview: Capitalization consistency for navigational tempates

← Older revision	Revision as of 12:33, 14 December 2020
(No difference)

Rudolf@tygron.nl at 14:41, 26 August 2020

2020-08-26T14:41:13Z

← Older revision		Revision as of 14:41, 26 August 2020
Line 46:		Line 46:
	* Either:		* Either:
	**Water Overlay's [[Surface_avg_direction_result_type_(Water_Overlay)\|surface average direction]] result type;		**Water Overlay's [[Surface_avg_direction_result_type_(Water_Overlay)\|surface average direction]] result type;
	**[[~~Terrain Height\|Digital terrain~~ model ~~(DTM)~~]].		**[[Elevation model]].
	* [[Culvert_(Water Overlay)\|Culverts]]: Culverts are derived from		* [[Culvert_(Water Overlay)\|Culverts]]: Culverts are derived from
	** a [[Water Overlay~~\|water overlay~~]] when the input is based on the directional result of that Water Overlay.		** a [[Water Overlay]] when the input is based on the directional result of that Water Overlay.
	** buildings containing the CULVERT_DIAMETER attribute otherwise. The Culvert function contains this attribute by default.		** buildings containing the CULVERT_DIAMETER attribute otherwise. The Culvert function contains this attribute by default.
	: Also note that culverts can now be generated using the [[Water Connection Generator]].		: Also note that culverts can now be generated using the [[Water Connection Generator]].

Frank@tygron.nl: /* Input */

2020-08-20T15:44:55Z

Input

← Older revision		Revision as of 15:44, 20 August 2020
Line 47:		Line 47:
	**Water Overlay's [[Surface_avg_direction_result_type_(Water_Overlay)\|surface average direction]] result type;		**Water Overlay's [[Surface_avg_direction_result_type_(Water_Overlay)\|surface average direction]] result type;
	**[[Terrain Height\|Digital terrain model (DTM)]].		**[[Terrain Height\|Digital terrain model (DTM)]].
	* [[Culvert_(Water Overlay)\|Culverts]]: Culverts are ~~also~~ derived from a [[Water Overlay\|water overlay]] when the input is based on the directional result of that Water Overlay. ~~Otherwise it is based on~~ buildings containing the CULVERT_DIAMETER attribute. The Culvert function contains this attribute by default. Also note that culverts can now be generated using the [[Water Connection Generator]].		* [[Culvert_(Water Overlay)\|Culverts]]: Culverts are derived from
			** a [[Water Overlay\|water overlay]] when the input is based on the directional result of that Water Overlay.
			** buildings containing the CULVERT_DIAMETER attribute otherwise. The Culvert function contains this attribute by default.
			: Also note that culverts can now be generated using the [[Water Connection Generator]].

	==Options==		==Options==

Frank@tygron.nl: /* Input */

2020-08-20T15:43:29Z

Input

← Older revision		Revision as of 15:43, 20 August 2020
Line 47:		Line 47:
	**Water Overlay's [[Surface_avg_direction_result_type_(Water_Overlay)\|surface average direction]] result type;		**Water Overlay's [[Surface_avg_direction_result_type_(Water_Overlay)\|surface average direction]] result type;
	**[[Terrain Height\|Digital terrain model (DTM)]].		**[[Terrain Height\|Digital terrain model (DTM)]].
	* [[Culvert_(Water Overlay)\|Culverts]]: Culverts are also derived from a [[Water Overlay\|water overlay]] when the input is based on the directional result of that Water Overlay. Otherwise it is based on buildings containing the CULVERT_DIAMETER attribute. The Culvert function contains this attribute by default.		* [[Culvert_(Water Overlay)\|Culverts]]: Culverts are also derived from a [[Water Overlay\|water overlay]] when the input is based on the directional result of that Water Overlay. Otherwise it is based on buildings containing the CULVERT_DIAMETER attribute. The Culvert function contains this attribute by default. Also note that culverts can now be generated using the [[Water Connection Generator]].
	** Note that culverts can now be generated using the [[Water Connection Generator]].

	==Options==		==Options==

Frank@tygron.nl: /* Input */

2020-08-20T15:43:10Z

Input

← Older revision		Revision as of 15:43, 20 August 2020
Line 47:		Line 47:
	**Water Overlay's [[Surface_avg_direction_result_type_(Water_Overlay)\|surface average direction]] result type;		**Water Overlay's [[Surface_avg_direction_result_type_(Water_Overlay)\|surface average direction]] result type;
	**[[Terrain Height\|Digital terrain model (DTM)]].		**[[Terrain Height\|Digital terrain model (DTM)]].
	* [[Culvert_(Water Overlay)\|Culverts]] ~~(Optional)~~: Culverts are ~~only taken into account~~ when based on the ~~surface average direction~~ result ~~type, because the culverts are identified based on the configuration~~ of that [[Water Overlay~~\|water overlay]]~~.		* [[Culvert_(Water Overlay)\|Culverts]]: Culverts are also derived from a [[Water Overlay\|water overlay]] when the input is based on the directional result of that Water Overlay. Otherwise it is based on buildings containing the CULVERT_DIAMETER attribute. The Culvert function contains this attribute by default.
	** Note that culverts can now be generated using the [[Water Connection Generator]].		** Note that culverts can now be generated using the [[Water Connection Generator]].

Rudolf@tygron.nl at 12:33, 14 August 2020

2020-08-14T12:33:38Z

← Older revision		Revision as of 12:33, 14 August 2020
Line 21:		Line 21:
	Historically, the calculation of watersheds for rainfall was done based on the gradient of the terrain. Issues occur 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 a lot of local minimas, which results in the creation of too many unique watersheds (oversegmentation). To solve this, one would often apply filters to the terrain to remove these local minimas, but this required a lot of user judgement.		Historically, the calculation of watersheds for rainfall was done based on the gradient of the terrain. Issues occur 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 a lot of local minimas, which results in the creation of too many unique watersheds (oversegmentation). To solve this, one would often apply filters to the terrain to remove these local minimas, but this required a lot of user judgement.

	Fortunately, instead of using only the gradient of the terrain directly, we can also simulate rainfall using our [[Rainfall (Overlay)]] and use the [[~~Surface_average_direction_result_type_~~(Water_Overlay)\|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.		Fortunately, instead of using only the gradient of the terrain directly, we can also simulate rainfall using our [[Rainfall (Overlay)]] and use the [[Surface_avg_direction_result_type_(Water_Overlay)\|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.

	==Discharge Areas==		==Discharge Areas==

Rudolf@tygron.nl at 12:31, 14 August 2020

2020-08-14T12:31:53Z

← Older revision		Revision as of 12:31, 14 August 2020
Line 45:		Line 45:
	* [[Discharge area (Watershed Overlay)\|Discharge areas]] (Advised);		* [[Discharge area (Watershed Overlay)\|Discharge areas]] (Advised);
	* Either:		* Either:
	**Water Overlay's [[~~Surface_average_direction_result_type_~~(Water_Overlay)\|surface average direction]] result type;		**Water Overlay's [[Surface_avg_direction_result_type_(Water_Overlay)\|surface average direction]] result type;
	**[[Terrain Height\|Digital terrain model (DTM)]].		**[[Terrain Height\|Digital terrain model (DTM)]].
	* [[Culvert_(Water Overlay)\|Culverts]] (Optional): Culverts are only taken into account when based on the surface average direction result type, because the culverts are identified based on the configuration of that [[Water Overlay\|water overlay]].		* [[Culvert_(Water Overlay)\|Culverts]] (Optional): Culverts are only taken into account when based on the surface average direction result type, because the culverts are identified based on the configuration of that [[Water Overlay\|water overlay]].

Hedi@tygron.com: /* Overview */

2020-07-27T09:08:33Z

Overview

← Older revision		Revision as of 09:08, 27 July 2020
Line 1:		Line 1:
	{{Template:Watershed Module buttons}}__NOTOC__		{{Template:Watershed Module buttons}}__NOTOC__
	==~~Overview~~==		==Concept==
	<ul>		<ul>
	<li style = "display:inline-block">[[File:Watershed_introduction.png\|400xpx]]</li>		<li style = "display:inline-block">[[File:Watershed_introduction.png\|400xpx]]</li>

Hedi@tygron.com: /* Overview */

2020-07-27T09:07:37Z

Overview

← Older revision		Revision as of 09:07, 27 July 2020
Line 18:		Line 18:
	<br style="clear:both">		<br style="clear:both">

	===Calculation===		==Calculation==
	Historically, the calculation of watersheds for rainfall was done based on the gradient of the terrain. Issues occur 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 a lot of local minimas, which results in the creation of too many unique watersheds (oversegmentation). To solve this, one would often apply filters to the terrain to remove these local minimas, but this required a lot of user judgement.		Historically, the calculation of watersheds for rainfall was done based on the gradient of the terrain. Issues occur 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 a lot of local minimas, which results in the creation of too many unique watersheds (oversegmentation). To solve this, one would often apply filters to the terrain to remove these local minimas, but this required a lot of user judgement.

	Fortunately, instead of using only the gradient of the terrain directly, we can also simulate rainfall using our [[Rainfall (Overlay)]] and use the [[Surface_average_direction_result_type_(Water_Overlay)\|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.		Fortunately, instead of using only the gradient of the terrain directly, we can also simulate rainfall using our [[Rainfall (Overlay)]] and use the [[Surface_average_direction_result_type_(Water_Overlay)\|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.

	===Discharge Areas===		==Discharge Areas==
	In a water system model, the waterways generally catch the rainfall and transport it elsewhere, often out of the system. These waterways can be considered the end point of a rain drops travel overland and we could call them discharge waterways.		In a water system model, the waterways generally catch the rainfall and transport it elsewhere, often out of the system. These waterways can be considered the end point of a rain drops travel overland and we could call them discharge waterways.

Line 32:		Line 32:
	In absence of, or in addition to, discharge areas, users can also choose to automatically add discharge areas for each individual waterway and waterbody. However, when these waterways or bodies are still connected to a provided Discharge area, they can still be overwritten by this prioritized discharge area.		In absence of, or in addition to, discharge areas, users can also choose to automatically add discharge areas for each individual waterway and waterbody. However, when these waterways or bodies are still connected to a provided Discharge area, they can still be overwritten by this prioritized discharge area.

	===Culverts===		==Culverts==
	Since the propagation of discharge areas to neighboring waterways heavily relies on the connectivity of water system, [[Culvert_(Water_Overlay)\|culverts]] are important. Optionally, we could even restrict this propagation based on the direction of the flow through this culvert, allowing only the propagation from A to B when B flows to A.		Since the propagation of discharge areas to neighboring waterways heavily relies on the connectivity of water system, [[Culvert_(Water_Overlay)\|culverts]] are important. Optionally, we could even restrict this propagation based on the direction of the flow through this culvert, allowing only the propagation from A to B when B flows to A.

← Older revision		Revision as of 12:31, 14 August 2020
Line 45:		Line 45:
	* [[Discharge area (Watershed Overlay)\|Discharge areas]] (Advised);		* [[Discharge area (Watershed Overlay)\|Discharge areas]] (Advised);
	* Either:		* Either:
	**Water Overlay's [[~~Surface_average_direction_result_type_~~(Water_Overlay)\|surface average direction]] result type;		**Water Overlay's [[Surface_avg_direction_result_type_(Water_Overlay)\|surface average direction]] result type;
	**[[Terrain Height\|Digital terrain model (DTM)]].		**[[Terrain Height\|Digital terrain model (DTM)]].
	* [[Culvert_(Water Overlay)\|Culverts]] (Optional): Culverts are only taken into account when based on the surface average direction result type, because the culverts are identified based on the configuration of that [[Water Overlay\|water overlay]].		* [[Culvert_(Water Overlay)\|Culverts]] (Optional): Culverts are only taken into account when based on the surface average direction result type, because the culverts are identified based on the configuration of that [[Water Overlay\|water overlay]].