Case study:Burn of Mosset, Forres - Revision history

Alexrrc at 10:00, 5 June 2017

2017-06-05T10:00:59Z

← Older revision		Revision as of 10:00, 5 June 2017
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	\|Bank and bed modifications measure=Create breaches in the bank,		\|Bank and bed modifications measure=Create breaches in the bank,
	\|Floodplain / River corridor=Floodplain reconnection, Riparian planting,		\|Floodplain / River corridor=Floodplain reconnection, Riparian planting,
	\|Planform / Channel pattern=~~Allow future natural channel changes to occur~~,		\|Planform / Channel pattern=Channel naturalisation,
	}}		}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}

Alexrrc at 13:40, 1 June 2017

2017-06-01T13:40:52Z

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	}}		}}
	{{Measures		{{Measures
	\|Bank and bed modifications measure=Create breaches in the bank,		\|Bank and bed modifications measure=Create breaches in the bank,
	\|Floodplain / River corridor=Floodplain reconnection, Riparian ~~tree~~ planting,		\|Floodplain / River corridor=Floodplain reconnection, Riparian planting,
	\|Planform / Channel pattern=Allow future natural channel changes to occur,		\|Planform / Channel pattern=Allow future natural channel changes to occur,
	}}		}}
	{{Hydromorphological quality elements header}}		{{Hydromorphological quality elements header}}

Nick Elbourne at 15:09, 16 July 2015

2015-07-16T15:09:35Z

← Older revision		Revision as of 15:09, 16 July 2015
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	This was achieved by breaching the existing embanked channel which ran around a field boundary at two points, allowing flow to spill out across the open field, before re-joining the original channel just upstream of the dam. Tress were planted across the site to create a wet woodland habitat.		This was achieved by breaching the existing embanked channel which ran around a field boundary at two points, allowing flow to spill out across the open field, before re-joining the original channel just upstream of the dam. Tress were planted across the site to create a wet woodland habitat.

	Since construction in 2008 the scheme is effectively storing large wood and sediment, with a large sediment outwash fan forming at the upstream breach. A small amount of adaptive management has been required at the upstream breach due to erosional events interacting with woody material in the channel. Measures were taken to ensure that a further breach of the old channel did not occur, as this could have led to flooding of a significant area of agricultural land.

	~~In 2010 the scheme was awarded an "environmentally sustainable construction" commendation by the Institute of Civil Engineers.~~
	This project is part of the UK River Restoration Center's manual of river restoration techniques (update due to be published in late 2013).		This project is part of the UK River Restoration Center's manual of river restoration techniques (update due to be published in late 2013).
	\|Monitoring surveys and results=Approximately one year after the banks were breached in September 2009, the channel experienced an estimated 30m3/s flood flow (of the order of a 1 in 10 year event). The stone protection at the upstream breach was partially washed out, as anticipated. The breach enlarged such that the majority of the flow was diverted along the new route after the flow subsided. The result was rapid development of river features including the formation of an outwash fan. Some ecological degradation has occurred in the short term as the old channel is now dry except during very high flow events.		\|Monitoring surveys and results=Approximately one year after the banks were breached in September 2009, the channel experienced an estimated 30m3/s flood flow (of the order of a 1 in 10 year event). The stone protection at the upstream breach was partially washed out, as anticipated. The breach enlarged such that the majority of the flow was diverted along the new route after the flow subsided. The result was rapid development of river features including the formation of an outwash fan. Some ecological degradation has occurred in the short term as the old channel is now dry except during very high flow events.

	Small on-going adaptive management is predicted to be necessary in the short to medium term until this modified river system becomes better established.		Small on-going adaptive management is predicted to be necessary in the short to medium term until this modified river system becomes better established.
	\|Lessons learn=Overall this scheme illustrates what can be achieved when working with natural sediment transport processes in flood storage zones. In 2010, the Saltire Society of Scotland in association with the Institution of Civil Engineers awarded the Forres Flood Alleviation Scheme its 'Environmental Sustainable Construction' commendation.		\|Lessons learn=Overall this scheme illustrates what can be achieved when working with natural sediment transport processes in flood storage zones. In 2010, the Saltire Society of Scotland in association with the Institution of Civil Engineers awarded the Forres Flood Alleviation Scheme its 'Environmental Sustainable Construction' commendation.
	}}		}}

Nick Elbourne at 15:08, 16 July 2015

2015-07-16T15:08:36Z

← Older revision		Revision as of 15:08, 16 July 2015
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	\|Themes=Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology		\|Themes=Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology
	\|Country=Scotland		\|Country=Scotland
	\|Main contact forename=~~Barbara~~		\|Main contact forename=Paul
	\|Main contact surname=~~Hellett~~		\|Main contact surname=Winfield
	\|Contact organisation=Royal HaskoningDHV		\|Contact organisation=Royal HaskoningDHV
	\|Multi-site=No		\|Multi-site=No
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	In 2010 the scheme was awarded an "environmentally sustainable construction" commendation by the Institute of Civil Engineers.		In 2010 the scheme was awarded an "environmentally sustainable construction" commendation by the Institute of Civil Engineers.
	This project is part of the UK River Restoration Center's manual of river restoration techniques (update due to be published in late 2013).		This project is part of the UK River Restoration Center's manual of river restoration techniques (update due to be published in late 2013).
			\|Monitoring surveys and results=Approximately one year after the banks were breached in September 2009, the channel experienced an estimated 30m3/s flood flow (of the order of a 1 in 10 year event). The stone protection at the upstream breach was partially washed out, as anticipated. The breach enlarged such that the majority of the flow was diverted along the new route after the flow subsided. The result was rapid development of river features including the formation of an outwash fan. Some ecological degradation has occurred in the short term as the old channel is now dry except during very high flow events.

			Small on-going adaptive management is predicted to be necessary in the short to medium term until this modified river system becomes better established.
			\|Lessons learn=Overall this scheme illustrates what can be achieved when working with natural sediment transport processes in flood storage zones. In 2010, the Saltire Society of Scotland in association with the Institution of Civil Engineers awarded the Forres Flood Alleviation Scheme its 'Environmental Sustainable Construction' commendation.
	}}		}}
	{{Image gallery}}		{{Image gallery}}

Nick Elbourne at 14:13, 16 July 2015

2015-07-16T14:13:13Z

← Older revision		Revision as of 14:13, 16 July 2015
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	\|Themes=Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology		\|Themes=Fisheries, Flood risk management, Habitat and biodiversity, Hydromorphology
	\|Country=Scotland		\|Country=Scotland
	\|Main contact forename=~~Matthew~~		\|Main contact forename=Barbara
	\|Main contact surname=~~Hardwick~~		\|Main contact surname=Hellett
	\|Contact organisation=Royal HaskoningDHV		\|Contact organisation=Royal HaskoningDHV
	\|Multi-site=No		\|Multi-site=No

NickRRC at 12:49, 20 September 2013

2013-09-20T12:49:43Z

← Older revision		Revision as of 12:49, 20 September 2013
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	{{Case study status		{{Case study status
	\|Approval status=~~Draft~~		\|Approval status=Approved
	}}		}}
	{{Location		{{Location

Admin at 07:22, 6 September 2013

2013-09-06T07:22:21Z

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 This project is part of the UK River Restoration Center's manual of river restoration techniques (update due to be published in late 2013).
 }}
 {{Case study subcatchment
 |Subcatchment=Burn of Mosset
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 {{Monitoring documents}}
 {{Monitoring documents end}}
 {{Additional Documents}}
 {{Additional Documents end}}
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 {{Additional links and references footer}}
 {{Supplementary Information}}

NickRRC at 09:37, 16 July 2013

2013-07-16T09:37:10Z

← Older revision		Revision as of 09:37, 16 July 2013
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	\|Project summary=The Burn of Mosset is a small gravel bed stream draining an area of 49km2. A Tributary of the River Findhorn, it flows north through the town of Forres before entering Findhorn bay. The town of Forres has a long history of flooding from the burn, with six flood events causing serious damage to property or disruption in the last fifty years.		\|Project summary=The Burn of Mosset is a small gravel bed stream draining an area of 49km2. A Tributary of the River Findhorn, it flows north through the town of Forres before entering Findhorn bay. The town of Forres has a long history of flooding from the burn, with six flood events causing serious damage to property or disruption in the last fifty years.
	The new Flood Alleviation Scheme (FAS) took two years to complete. It included the construction of an earth-filled embankment dam designed to allow for discharges up to 8.5 m3/s to flow through Forres, with excess floodwater temporarily stored behind the dam.		The new Flood Alleviation Scheme (FAS) took two years to complete. It included the construction of an earth-filled embankment dam designed to allow for discharges up to 8.5 m3/s to flow through Forres, with excess floodwater temporarily stored behind the dam.

	In addition to this, the upstream storage area has been designed to create an extensive natural sediment accretion zone (for sand, gravel and large wood). This will reduce the risk of sediment or other debris blocking the dam control structure. The scheme also aimed to create a mosaic of river and floodplain habitats, by working with natural processes to develop a multi-thread (anabranched) system.		In addition to this, the upstream storage area has been designed to create an extensive natural sediment accretion zone (for sand, gravel and large wood). This will reduce the risk of sediment or other debris blocking the dam control structure. The scheme also aimed to create a mosaic of river and floodplain habitats, by working with natural processes to develop a multi-thread (anabranched) system.
	This was achieved by breaching the existing embanked channel which ran around a field boundary at two points, allowing flow to spill out across the open field, before re-joining the original channel just upstream of the dam. Tress were planted across the site to create a wet woodland habitat.		This was achieved by breaching the existing embanked channel which ran around a field boundary at two points, allowing flow to spill out across the open field, before re-joining the original channel just upstream of the dam. Tress were planted across the site to create a wet woodland habitat.

	Since construction in 2008 the scheme is effectively storing large wood and sediment, with a large sediment outwash fan forming at the upstream breach. A small amount of adaptive management has been required at the upstream breach due to erosional events interacting with woody material in the channel. Measures were taken to ensure that a further breach of the old channel did not occur, as this could have led to flooding of a significant area of agricultural land.		Since construction in 2008 the scheme is effectively storing large wood and sediment, with a large sediment outwash fan forming at the upstream breach. A small amount of adaptive management has been required at the upstream breach due to erosional events interacting with woody material in the channel. Measures were taken to ensure that a further breach of the old channel did not occur, as this could have led to flooding of a significant area of agricultural land.

	In 2010 the scheme was awarded an "environmentally sustainable construction" commendation by the Institute of Civil Engineers.		In 2010 the scheme was awarded an "environmentally sustainable construction" commendation by the Institute of Civil Engineers.
	This project is part of the UK River Restoration Center's manual of river restoration techniques (update due to be published in late 2013).		This project is part of the UK River Restoration Center's manual of river restoration techniques (update due to be published in late 2013).
	}}		}}
	{{Case study subcatchment		{{Case study subcatchment

NickRRC at 09:36, 16 July 2013

2013-07-16T09:36:31Z

← Older revision		Revision as of 09:36, 16 July 2013
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	Since construction in 2008 the scheme is effectively storing large wood and sediment, with a large sediment outwash fan forming at the upstream breach. A small amount of adaptive management has been required at the upstream breach due to erosional events interacting with woody material in the channel. Measures were taken to ensure that a further breach of the old channel did not occur, as this could have led to flooding of a significant area of agricultural land.		Since construction in 2008 the scheme is effectively storing large wood and sediment, with a large sediment outwash fan forming at the upstream breach. A small amount of adaptive management has been required at the upstream breach due to erosional events interacting with woody material in the channel. Measures were taken to ensure that a further breach of the old channel did not occur, as this could have led to flooding of a significant area of agricultural land.
	In 2010 the scheme was awarded an "environmentally sustainable construction" commendation by the Institute of Civil Engineers.		In 2010 the scheme was awarded an "environmentally sustainable construction" commendation by the Institute of Civil Engineers.
			This project is part of the UK River Restoration Center's manual of river restoration techniques (update due to be published in late 2013).
	}}		}}
	{{Case study subcatchment		{{Case study subcatchment

NickRRC at 09:32, 16 July 2013

2013-07-16T09:32:41Z

← Older revision		Revision as of 09:32, 16 July 2013
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	{{Additional links and references		{{Additional links and references
	\|Link=www.royalhaskoning.co.uk/en-gb/Publication/Documents/projects/forres-flood-alleviation-scheme.pdf		\|Link=www.royalhaskoning.co.uk/en-gb/Publication/Documents/projects/forres-flood-alleviation-scheme.pdf
	\|Description=Forres Flood Alleviation Scheme		\|Description=Royal Haskoning- Forres Flood Alleviation Scheme
			}}
			{{Additional links and references
			\|Link=www.moray.gov.uk/downloads/file86456.pdf
			\|Description=Moray council- Forres FAS
	}}		}}
	{{Additional links and references footer}}		{{Additional links and references footer}}
	{{Supplementary Information}}		{{Supplementary Information}}