Manhole Simple Loss Example - Revision history

Emilie Nielsen at 01:43, 8 January 2026

2026-01-08T01:43:52Z

← Older revision		Revision as of 11:43, 8 January 2026
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	The calculated value matches that presented in figure 8 for the downstream conduit loss.		The calculated value matches that presented in figure 8 for the downstream conduit loss.


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Tuflowduncan: /* Example 1 - Entry Losses */

2021-05-26T13:33:39Z

Example 1 - Entry Losses

← Older revision		Revision as of 23:33, 26 May 2021
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	<br>		<br>
	Entry losses are applied as an exit loss on the incoming conduit and are calculated as follows:<br>		Entry losses are applied as an exit loss on the incoming conduit and are calculated as follows:<br>
	[[File:K entry.PNG~~\|595px~~]]		[[File:K entry.PNG]]
	<br>		<br>
	Where:<br>		Where:<br>

Tuflowduncan: /* Example 1 - Entry Losses */

2021-05-26T13:09:04Z

Example 1 - Entry Losses

← Older revision		Revision as of 23:09, 26 May 2021
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	<br>		<br>
	Entry losses are applied as an exit loss on the incoming conduit and are calculated as follows:<br>		Entry losses are applied as an exit loss on the incoming conduit and are calculated as follows:<br>
	[[File:K entry.PNG]]		[[File:K entry.PNG\|595px]]
	<br>		<br>
	Where:<br>		Where:<br>

Tuflowduncan: /* Example 1 - Entry Losses */

2021-05-26T09:02:15Z

Example 1 - Entry Losses

← Older revision		Revision as of 19:02, 26 May 2021
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	<br>		<br>
	Entry losses are applied as an exit loss on the incoming conduit and are calculated as follows:<br>		Entry losses are applied as an exit loss on the incoming conduit and are calculated as follows:<br>
	[[File:K entry.PNG~~\|200px~~]]		[[File:K entry.PNG]]
	<br>		<br>
	Where:<br>		Where:<br>

Tuflowduncan: /* Example 1 - Entry Losses */

2021-05-26T09:01:51Z

Example 1 - Entry Losses

← Older revision		Revision as of 19:01, 26 May 2021
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	<br>		<br>
	Entry losses are applied as an exit loss on the incoming conduit and are calculated as follows:<br>		Entry losses are applied as an exit loss on the incoming conduit and are calculated as follows:<br>
	[[File:K entry.PNG]]		[[File:K entry.PNG\|200px]]
	<br>		<br>
	Where:<br>		Where:<br>

Tuflowduncan: /* Example 1: Single Incoming/Outgoing Pipe with No Incoming Angle or Drop */

2021-05-26T08:38:12Z

Example 1: Single Incoming/Outgoing Pipe with No Incoming Angle or Drop

← Older revision		Revision as of 18:38, 26 May 2021
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	<br>		<br>
	A simple TUFLOW/ESTRY model was set up as shown in Figure 1 with the parameters for the manhole and the links upstream/downstream of the manhole shown in Table 1.<br>		A simple TUFLOW/ESTRY model was set up as shown in Figure 1 with the parameters for the manhole and the links upstream/downstream of the manhole shown in Table 1.<br>

	{{math \| ''E'' = ''mc''{{sup\|2}}}}
	<br>		<br>
	[[File:Schematic 1.png\|800px]]		[[File:Schematic 1.png\|800px]]

Tuflowduncan: /* Example 1: Single Incoming/Outgoing Pipe with No Incoming Angle or Drop */

2021-05-26T08:38:01Z

Example 1: Single Incoming/Outgoing Pipe with No Incoming Angle or Drop

← Older revision		Revision as of 18:38, 26 May 2021
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	A simple TUFLOW/ESTRY model was set up as shown in Figure 1 with the parameters for the manhole and the links upstream/downstream of the manhole shown in Table 1.<br>		A simple TUFLOW/ESTRY model was set up as shown in Figure 1 with the parameters for the manhole and the links upstream/downstream of the manhole shown in Table 1.<br>

	{{math\|''E'' = ''mc''{{sup\|2}}}}		{{math \| ''E'' = ''mc''{{sup\|2}}}}
	<br>		<br>
	[[File:Schematic 1.png\|800px]]		[[File:Schematic 1.png\|800px]]

Tuflowduncan: /* Example 1: Single Incoming/Outgoing Pipe with No Incoming Angle or Drop */

2021-05-26T08:37:46Z

Example 1: Single Incoming/Outgoing Pipe with No Incoming Angle or Drop

← Older revision		Revision as of 18:37, 26 May 2021
Line 9:		Line 9:
	A simple TUFLOW/ESTRY model was set up as shown in Figure 1 with the parameters for the manhole and the links upstream/downstream of the manhole shown in Table 1.<br>		A simple TUFLOW/ESTRY model was set up as shown in Figure 1 with the parameters for the manhole and the links upstream/downstream of the manhole shown in Table 1.<br>

	{{math\|1=''E'' = ''mc''{{sup\|2}}}}		{{math\|''E'' = ''mc''{{sup\|2}}}}
	<br>		<br>
	[[File:Schematic 1.png\|800px]]		[[File:Schematic 1.png\|800px]]

Tuflowduncan: /* Example 1: Single Incoming/Outgoing Pipe with No Incoming Angle or Drop */

2021-05-26T08:37:10Z

Example 1: Single Incoming/Outgoing Pipe with No Incoming Angle or Drop

← Older revision		Revision as of 18:37, 26 May 2021
Line 8:		Line 8:
	<br>		<br>
	A simple TUFLOW/ESTRY model was set up as shown in Figure 1 with the parameters for the manhole and the links upstream/downstream of the manhole shown in Table 1.<br>		A simple TUFLOW/ESTRY model was set up as shown in Figure 1 with the parameters for the manhole and the links upstream/downstream of the manhole shown in Table 1.<br>

			{{math\|1=''E'' = ''mc''{{sup\|2}}}}
	<br>		<br>
	[[File:Schematic 1.png\|800px]]		[[File:Schematic 1.png\|800px]]

Tuflowduncan: /* Example 3: Multiple Incoming Conduits with Incoming Bend and Drop in Invert Levels */

2021-05-26T08:33:44Z

Example 3: Multiple Incoming Conduits with Incoming Bend and Drop in Invert Levels

← Older revision		Revision as of 18:33, 26 May 2021
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	==Example 3: Multiple Incoming Conduits with Incoming Bend and Drop in Invert Levels==		==Example 3: Multiple Incoming Conduits with Incoming Bend and Drop in Invert Levels==

	In this example we have multiple incoming conduit. Each upstream conduit has a flow of 1m<sup>3</sup>s<sup>-1</sup> applied to it.		In this example we have multiple incoming conduit. Each upstream conduit has a flow of 1m<sup>3</sup>s<sup>-1</sup> applied to it.<br>

	[[File:Schematic 3.png\|800px]]		[[File:Schematic 3.png\|800px]]
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	\|'''Downstream Invert Level (m AD)''' \|\| 99.7 \|\| 99.8		\|'''Downstream Invert Level (m AD)''' \|\| 99.7 \|\| 99.8
	\|}		\|}
			<br>

	The resulting simulated loss values are presented in Figure 8.		The resulting simulated loss values are presented in Figure 8.
	<br>		<br>
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	<br>		<br>
	===Example 3 - Entry Losses===		===Example 3 - Entry Losses===

⚫	This time the flow area in the manhole is 3.57m<sup>2</sup> and 1m<sup>2</sup> in the adjacent culvert whilst the flow is 1m<sup>3</sup>/s for Q<sub>p</sub> and 2m<sup>3</sup>s<sup>-1</sup> for Q<sub>om</sub>. Therefore, V<sub>m</sub> equals:[[File:Vm3.PNG]]
	<br>		<br>
		⚫	This time the flow area in the manhole is 3.57m<sup>2</sup> and 1m<sup>2</sup> in the adjacent culvert whilst the flow is 1m<sup>3</sup>/s for Q<sub>p</sub> and 2m<sup>3</sup>s<sup>-1</sup> for Q<sub>om</sub>. Therefore, V<sub>m</sub> equals:<br>[[File:Vm3.PNG]]
⚫	And V<sub>p</sub>:[[File:Vp3.PNG]]
			<br>
		⚫	And V<sub>p</sub>:<br>[[File:Vp3.PNG]]
	<br>		<br>
	From this:		From this:<br>
	[[File:K entry3.PNG]]		[[File:K entry3.PNG]]<br>

	This matches the losses for both incoming pipes as shown in figure 8.		This matches the losses for both incoming pipes as shown in figure 8.

	===Example 3 - Exit Losses===		===Example 3 - Exit Losses===
	A'<sub>m</sub> is 3.57m<sup>2</sup> respectively. Therefore, K<sup>exit</sup>:[[File:K exit3.PNG]]		A'<sub>m</sub> is 3.57m<sup>2</sup> respectively. Therefore, K<sup>exit</sup>:<br>[[File:K exit3.PNG]]<br>

	The calculated losses match the losses calculated by the TUFLOW presented in Figure 8.		The calculated losses match the losses calculated by the TUFLOW presented in Figure 8.<br>

	===Example 3 - Outgoing Conduit Losses===		===Example 3 - Outgoing Conduit Losses===<br>
	In this model we have two incoming pipes, one with an 90 degree angle between the incoming and outgoing conduit and one with zero.		In this model we have two incoming pipes, one with an 90 degree angle between the incoming and outgoing conduit and one with zero.
	Recall that: [[File:Ktheta.PNG]]		Recall that: <br>[[File:Ktheta.PNG]]<br>

	With Qf calculated as: [[File:Qf.PNG]]		With Qf calculated as: <br>[[File:Qf.PNG]]
	<br>		<br>
	Q<sub>p</sub> is set to 1m<sup>3</sup>s<sup>-1</sup> and Q<sub>om</sub> to 2m<sup>3</sup>s<sup>-1</sup>. Q<sub>f</sub> is equal to 0.5m<sup>3</sup>s<sup>-1</sup>. For the incoming conduit with an angle of 90 degrees, K<sub>θ</sub> is therefore: [[File:Ktheta2a.PNG]]		Q<sub>p</sub> is set to 1m<sup>3</sup>s<sup>-1</sup> and Q<sub>om</sub> to 2m<sup>3</sup>s<sup>-1</sup>. Q<sub>f</sub> is equal to 0.5m<sup>3</sup>s<sup>-1</sup>. For the incoming conduit with an angle of 90 degrees, K<sub>θ</sub> is therefore: <br>[[File:Ktheta2a.PNG]]<br>

	For the incoming conduit with an angle of 0 degrees, K<sub>θ</sub> is therefore: [[File:Ktheta2b.PNG]]		For the incoming conduit with an angle of 0 degrees, K<sub>θ</sub> is therefore: <br>[[File:Ktheta2b.PNG]]<br>

	We also have a drop between the incoming and outgoing pipes. K<sub>drop</sub> which represents losses due to this drop is calculated as follows: [[File:Kdrop 2a.PNG]]		We also have a drop between the incoming and outgoing pipes. K<sub>drop</sub> which represents losses due to this drop is calculated as follows: <br>[[File:Kdrop 2a.PNG]]
	<br>		<br>
	and:[[File:Kdrop 2b.PNG]]		and:<br>[[File:Kdrop 2b.PNG]]<br>

	Therefore, K<sub>outletpipe</sub> is: [[File:K outletpipe3.PNG]]		Therefore, K<sub>outletpipe</sub> is: <br>[[File:K outletpipe3.PNG]]<br>

	The calculated value matches that presented in figure 8 for the downstream conduit loss.		The calculated value matches that presented in figure 8 for the downstream conduit loss.