Environmental flow - Revision history

Dominique Courret at 20:07, 5 May 2020

2020-05-05T20:07:10Z

Dominique Courret at 13:16, 3 May 2020

2020-05-03T13:16:37Z

Dominique Courret at 12:51, 3 May 2020

2020-05-03T12:51:12Z

Dominique Courret at 12:44, 3 May 2020

2020-05-03T12:44:55Z

Bendikhansen at 11:38, 10 October 2019

2019-10-10T11:38:53Z

Bendikhansen: Undo revision 2225 by Bendikhansen (talk)

2019-10-07T11:53:52Z

Undo revision 2225 by Bendikhansen (talk)

Bendikhansen: /* Environmental flow measures */

2019-10-07T11:47:05Z

Environmental flow measures

Bendikhansen: /* Environmental flow measures */

2019-10-07T11:36:58Z

Environmental flow measures

Bendikhansen: /* Introduction */

2019-06-20T12:03:06Z

Introduction

Bendikhansen at 13:24, 17 January 2019

2019-01-17T13:24:10Z

@@ Line 4: / Line 4: @@
 Hydropower projects will in most cases change the flow pattern of the affected rivers. The changes in flow are very site-specific and dependent on how the actual project is designed. A hydropower project with a large reservoir for storage of water (‘reservoir-based hydropower’) generally allows much larger changes in flow than a run-of-the river plant. Reservoir-based hydropower can store water from the wet to the dry season and can hence introduce large changes in the periodicity of the flow. Reservoir-based hydropower can also store all or parts of floods, and will typically reduce both the magnitude, peaks and frequency of floods. Run-of-the river plants have limited storage capabilities and will not introduce any changes in the periodicity of the water flow radically, only in hours or a few days’ time horizon. Both storage and run-of-the river plants can, however, short-cut river stretches (‘bypass sections), which will experience dramatically reduced flow in most of the year.
-The habitat conditions are directly affected by the flow and related hydraulic variables such as water depth, water velocity and water-covered areas, and new management practises aim at keeping or restoring natural flow regimes [1]. Water temperatures are key factors in the development and growth of salmonids [2] and are also to a large extent determined by the volumes of water available. The development of the substrate will in longer time horizon be directly affected by the changes in the water flow regime. The functioning of measures presented in this report are also directly dependent on the availability of water and can rarely be implemented without also considering the water flow regime.
+The habitat conditions are directly affected by the flow and related hydraulic variables such as water depth, water velocity and water-covered areas, and new management practises aim at keeping or restoring natural flow regimes (Poff et al., 2017). Water temperatures are key factors in the development and growth of salmonids (Jonsson and Jonsson, 2011) and are also to a large extent determined by the volumes of water available. The development of the substrate will in longer time horizon be directly affected by the changes in the water flow regime. The functioning of measures presented in this report are also directly dependent on the availability of water and can rarely be implemented without also considering the water flow regime.
 =Environmental flow measures=
@@ Line 17: / Line 17: @@
 =Relevant literature=
-[1] Poff, N.L., Allan, J.D., Bain, M.B., Karr, J.R., Prestegaard, K.L., Richter, B.D., Sparks, R.E. and stromberg, J.C. 1997. The Natural Flow Regime: A paradign fo river conservation and restoration. BioScience 47, 769-784.
+Jonsson, B. and Jonsson, N. 2011. Ecology of Atlantic Salmon and Brown Trout - Habitat as template for life histories. Springer publishing.
-[2] Jonsson, B. and Jonsson, N. 2011. Ecology of Atlantic Salmon and Brown Trout - Habitat as template for life histories. Springer publishing.
+Poff, N.L., Allan, J.D., Bain, M.B., Karr, J.R., Prestegaard, K.L., Richter, B.D., Sparks, R.E. and stromberg, J.C. 1997. The Natural Flow Regime: A paradign fo river conservation and restoration. BioScience 47, 769-784.
 [[Category: Types of problems]]

@@ Line 4: / Line 4: @@
 Hydropower projects will in most cases change the flow pattern of the affected rivers. The changes in flow are very site-specific and dependent on how the actual project is designed. A hydropower project with a large reservoir for storage of water (‘reservoir-based hydropower’) generally allows much larger changes in flow than a run-of-the river plant. Reservoir-based hydropower can store water from the wet to the dry season and can hence introduce large changes in the periodicity of the flow. Reservoir-based hydropower can also store all or parts of floods, and will typically reduce both the magnitude, peaks and frequency of floods. Run-of-the river plants have limited storage capabilities and will not introduce any changes in the periodicity of the water flow radically, only in hours or a few days’ time horizon. Both storage and run-of-the river plants can, however, short-cut river stretches (‘bypass sections), which will experience dramatically reduced flow in most of the year.
-The habitat conditions are directly affected by the flow and related hydraulic variables such as water depth, water velocity and water-covered areas, and new management practises aim at keeping or restoring natural flow regimes (Poff et al. 1997). Water temperatures are key factors in the development and growth of salmonids (Jonsson and Jonsson 2011) and are also to a large extent determined by the volumes of water available. The development of the substrate will in longer time horizon be directly affected by the changes in the water flow regime. The functioning of measures presented in this report are also directly dependent on the availability of water and can rarely be implemented without also considering the water flow regime.
+The habitat conditions are directly affected by the flow and related hydraulic variables such as water depth, water velocity and water-covered areas, and new management practises aim at keeping or restoring natural flow regimes [1]. Water temperatures are key factors in the development and growth of salmonids [2] and are also to a large extent determined by the volumes of water available. The development of the substrate will in longer time horizon be directly affected by the changes in the water flow regime. The functioning of measures presented in this report are also directly dependent on the availability of water and can rarely be implemented without also considering the water flow regime.
 =Environmental flow measures=
@@ Line 17: / Line 17: @@
 =Relevant literature=
-Poff, N.L., Allan, J.D., Bain, M.B., Karr, J.R., Prestegaard, K.L., Richter, B.D., Sparks, R.E. and stromberg, J.C. 1997. The Natural Flow Regime: A paradign fo river conservation and restoration. BioScience 47, 769-784.
+[1] Poff, N.L., Allan, J.D., Bain, M.B., Karr, J.R., Prestegaard, K.L., Richter, B.D., Sparks, R.E. and stromberg, J.C. 1997. The Natural Flow Regime: A paradign fo river conservation and restoration. BioScience 47, 769-784.
-Jonsson, B. and Jonsson, N. 2011. Ecology of Atlantic Salmon and Brown Trout - Habitat as template for life histories. Springer publishing.
+[2] Jonsson, B. and Jonsson, N. 2011. Ecology of Atlantic Salmon and Brown Trout - Habitat as template for life histories. Springer publishing.
 [[Category: Types of problems]]

← Older revision		Revision as of 12:51, 3 May 2020
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		+	=Relevant literature=
		+
		+	Poff, N.L., Allan, J.D., Bain, M.B., Karr, J.R., Prestegaard, K.L., Richter, B.D., Sparks, R.E. and stromberg, J.C. 1997. The Natural Flow Regime: A paradign fo river conservation and restoration. BioScience 47, 769-784.
		+
		+	Jonsson, B. and Jonsson, N. 2011. Ecology of Atlantic Salmon and Brown Trout - Habitat as template for life histories. Springer publishing.

	[[Category: Types of problems]]		[[Category: Types of problems]]

@@ Line 4: / Line 4: @@
 Hydropower projects will in most cases change the flow pattern of the affected rivers. The changes in flow are very site-specific and dependent on how the actual project is designed. A hydropower project with a large reservoir for storage of water (‘reservoir-based hydropower’) generally allows much larger changes in flow than a run-of-the river plant. Reservoir-based hydropower can store water from the wet to the dry season and can hence introduce large changes in the periodicity of the flow. Reservoir-based hydropower can also store all or parts of floods, and will typically reduce both the magnitude, peaks and frequency of floods. Run-of-the river plants have limited storage capabilities and will not introduce any changes in the periodicity of the water flow radically, only in hours or a few days’ time horizon. Both storage and run-of-the river plants can, however, short-cut river stretches (‘bypass sections), which will experience dramatically reduced flow in most of the year.
-The habitat conditions are directly affected by the flow and related hydraulic variables such as water depth, water velocity and water-covered areas, and new management practises aim at keeping or restoring natural flow regimes (Poff et al. 1997). Water temperatures are key factors in the development and growth of salmonids (Jonsson and Jonsson 2011) and are also to a large extent determined by the volumes of water available, and the development of the substrate will in longer time horizon be directly affected by the changes in the water flow regime. The functioning of other measures presented in this report are also directly dependent on the availability of water and can rarely be implemented without also considering the water flow regime.
+The habitat conditions are directly affected by the flow and related hydraulic variables such as water depth, water velocity and water-covered areas, and new management practises aim at keeping or restoring natural flow regimes (Poff et al. 1997). Water temperatures are key factors in the development and growth of salmonids (Jonsson and Jonsson 2011) and are also to a large extent determined by the volumes of water available. The development of the substrate will in longer time horizon be directly affected by the changes in the water flow regime. The functioning of measures presented in this report are also directly dependent on the availability of water and can rarely be implemented without also considering the water flow regime.
 =Environmental flow measures=

@@ Line 1: / Line 1: @@
 =Introduction=
-[[File:e-flow.png|thumb|500px|Figure 1: Environmental flow release in Mandal River, Norway (Photo: Atle Harby)]]
+[[File:e-flow.png|thumb|500px|Figure 1: Environmental flow release in Mandal River, Norway]]
 Hydropower projects will in most cases change the flow pattern of the affected rivers. The changes in flow are very site-specific and dependent on how the actual project is designed. A hydropower project with a large reservoir for storage of water (‘reservoir-based hydropower’) generally allows much larger changes in flow than a run-of-the river plant. Reservoir-based hydropower can store water from the wet to the dry season and can hence introduce large changes in the periodicity of the flow. Reservoir-based hydropower can also store all or parts of floods, and will typically reduce both the magnitude, peaks and frequency of floods. Run-of-the river plants have limited storage capabilities and will not introduce any changes in the periodicity of the water flow radically, only in hours or a few days’ time horizon. Both storage and run-of-the river plants can, however, short-cut river stretches (‘bypass sections), which will experience dramatically reduced flow in most of the year.

@@ Line 12: / Line 12: @@
 GLOMMA_BYPASS_SQUARE.png|[[Mitigating reduced annual flow and low flow measures]]
 stranding_ex_square.png|[[Mitigating rapid, short-term variations in flow (hydro-peaking operations)]]
-bjorset_regulated_square.png|[[Mitigating reduced flood-peak magnitude and frequency]]
+bjorset_regulated_square.png|[[Mitigating reduced flood peaks, magnitudes, and frequency]]
 </gallery></font>
 [[Category: Types of problems]]

← Older revision		Revision as of 13:24, 17 January 2019
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−	~~==Environmental flow in bypass section==~~
−	*[[Mitigating reductions in total annual flow]]
−
−	*[[Mitigating reduced flood peaks, magnitudes, and frequency]]
−
−	*[[Mitigating rapid, short-term variations in flow (hydro-peaking operations)]]

	[[Category: Types of problems]]		[[Category: Types of problems]]