Watershed Module - Revision history

Hedi@tygron.com at 09:08, 27 July 2020

2020-07-27T09:08:04Z

@@ Line 12: / Line 12: @@
 * 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.
 ==See also==
 * [[Watershed (Overlay)|Watershed overlay]]

Hedi@tygron.com at 09:03, 27 July 2020

2020-07-27T09:03:23Z

← Older revision		Revision as of 09:03, 27 July 2020
Line 12:		Line 12:
	* 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 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.		* A client has to solve disputes with landowners complaining about (the lack of) rainfall discharge on their land.

	~~===Considerations===~~
	~~The [[Watershed (Overlay)\|watershed overlay]] calculates watershed areas based on:~~
	* A heavy rainfall;
	* Sewer is not taken into account;
	* Large Forests often do not have proper discharge when not close to water ways;
	* Certain computed watershed areas might not be connected to the original water system used as input, in the form as discharge areas. This in turn can help find flaws in your water system;
	* Culverts are important for the connectivity of discharge areas, but often not all culverts are initially know or defined. The water connection generator tool has been added to generated culverts on a large scale based on defined input parameters;

	===Concept===		===Concept===

Frank@tygron.nl: /* Considerations */

2020-06-30T09:15:53Z

Considerations

← Older revision		Revision as of 09:15, 30 June 2020
Line 14:		Line 14:

	===Considerations===		===Considerations===
	The watershed overlay calculates watershed areas based on:		The [[Watershed (Overlay)\|watershed overlay]] calculates watershed areas based on:
	* A heavy rainfall;		* A heavy rainfall;
	* Sewer is not taken into account;		* Sewer is not taken into account;

Hedi@tygron.com: /* Calculation */

2020-06-12T09:43:06Z

Calculation

← Older revision		Revision as of 09:43, 12 June 2020
Line 36:		Line 36:

	===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 ~~contain~~ 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.

Godelief@tygron.com: /* Culverts */

2020-06-12T08:16:19Z

Culverts

← Older revision		Revision as of 08:16, 12 June 2020
Line 50:		Line 50:

	===Culverts===		===Culverts===
	Since the propagation of discharge areas to neighboring waterways heavily relies on the connectivity of water system, culverts are important. Optionally, we could ~~restrict~~ 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.

	Unfortunately, the available ~~geo-~~data on the locations of culverts is often incomplete, containing mostly the most important culverts but missing the minor ones. We have therefore added a [[Water Connection Generator]] tool to automatically add culverts based on configured parameters.		Unfortunately, the available Geo data on the locations of culverts is often incomplete, containing mostly the most important culverts but missing the minor ones. We have therefore added a [[Water Connection Generator]] tool to automatically add culverts based on configured parameters.
	In general it deals with concepts such as:		In general it deals with concepts such as:
	* culvert generally do not cross major roads, but can cross driveways on private plots;		* culvert generally do not cross major roads, but can cross driveways on private plots;

Godelief@tygron.com: /* Calculation */

2020-06-12T08:15:15Z

Calculation

← Older revision		Revision as of 08:15, 12 June 2020
Line 38:		Line 38:
	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 contain 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 contain 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 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===

Frank@tygron.nl: /* Culverts */

2020-06-10T13:51:17Z

Culverts

← Older revision		Revision as of 13:51, 10 June 2020
Line 57:		Line 57:
	* culverts generally connect waterways, and not large water bodies;		* culverts generally connect waterways, and not large water bodies;
	* culverts generally do not connect waterways of distinctly different heights or waterlevels;		* culverts generally do not connect waterways of distinctly different heights or waterlevels;

			==See also==
			* [[Watershed (Overlay)\|Watershed overlay]]

Frank@tygron.nl: /* Watersheds applications */

2020-06-10T12:14:40Z

Watersheds applications

← Older revision		Revision as of 12:14, 10 June 2020
Line 12:		Line 12:
	* 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 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.		* A client has to solve disputes with landowners complaining about (the lack of) rainfall discharge on their land.

			===Considerations===
			The watershed overlay calculates watershed areas based on:
			* A heavy rainfall;
			* Sewer is not taken into account;
			* Large Forests often do not have proper discharge when not close to water ways;
			* Certain computed watershed areas might not be connected to the original water system used as input, in the form as discharge areas. This in turn can help find flaws in your water system;
			* Culverts are important for the connectivity of discharge areas, but often not all culverts are initially know or defined. The water connection generator tool has been added to generated culverts on a large scale based on defined input parameters;

	===Concept===		===Concept===

Frank@tygron.nl: /* Culverts */

2020-06-10T12:05:50Z

Culverts

← Older revision		Revision as of 12:05, 10 June 2020
Line 44:		Line 44:
	Since the propagation of discharge areas to neighboring waterways heavily relies on the connectivity of water system, culverts are important. Optionally, we could restrict 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, culverts are important. Optionally, we could restrict 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.

	Unfortunately, the available geo-data on the locations of culverts is often incomplete, containing mostly the most important culverts but missing the minor ones. We have therefore added a [[Water ~~connection generator~~]] tool to automatically add culverts based on configured parameters.		Unfortunately, the available geo-data on the locations of culverts is often incomplete, containing mostly the most important culverts but missing the minor ones. We have therefore added a [[Water Connection Generator]] tool to automatically add culverts based on configured parameters.
	In general it deals with concepts such as:		In general it deals with concepts such as:
	* culvert generally do not cross major roads, but can cross driveways on private plots;		* culvert generally do not cross major roads, but can cross driveways on private plots;
	* culverts generally connect waterways, and not large water bodies;		* culverts generally connect waterways, and not large water bodies;
	* culverts generally do not connect waterways of distinctly different heights or waterlevels;		* culverts generally do not connect waterways of distinctly different heights or waterlevels;

Frank@tygron.nl: /* Culverts */

2020-06-10T12:05:37Z

Culverts

← Older revision		Revision as of 12:05, 10 June 2020
Line 44:		Line 44:
	Since the propagation of discharge areas to neighboring waterways heavily relies on the connectivity of water system, culverts are important. Optionally, we could restrict 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, culverts are important. Optionally, we could restrict 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.

	Unfortunately, the available geo-data on the locations of culverts is often incomplete, containing mostly the most important culverts but missing the minor ones. We have therefore added a [[~~Waterobject generation tool\|culvert generation tool~~]] to automatically add culverts based on configured parameters.		Unfortunately, the available geo-data on the locations of culverts is often incomplete, containing mostly the most important culverts but missing the minor ones. We have therefore added a [[Water connection generator]] tool to automatically add culverts based on configured parameters.
	In general it deals with concepts such as:		In general it deals with concepts such as:
	* culvert generally do not cross major roads, but can cross driveways on private plots;		* culvert generally do not cross major roads, but can cross driveways on private plots;
	* culverts generally connect waterways, and not large water bodies;		* culverts generally connect waterways, and not large water bodies;
	* culverts generally do not connect waterways of distinctly different heights or waterlevels;		* culverts generally do not connect waterways of distinctly different heights or waterlevels;