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Flood Risk Activities Permits

This is quite a long list! Please press "Control + F" on you key board and search for the information you require. Other wise please select the permit you are interested in from the below list. If you would like to discuss please call us on the above numbers for a no obligation discussion. 

Temporary dewatering affecting up to 20 metres of river SR2015 No.26
Installation of an outfall of 300mm to 500mm through a headwall into a main river SR2015 No.27
Installing a clear span bridge on a main river of up to 8 metres span and 4.2 metres width SR2015 No.28
Temporary storage within the flood plain of a main river SR2015 No.29
Temporary diversion of a main river SR2015 No.30
Channel habitat structure made of natural materials occupying up to 100 metres of a main river SR2015 No.31
Installing an access culvert of no more than 5 metres length on main river SR2015 No.32
Repairing and protecting up to 20 metres of the bank of a main river using natural materials SR2015 No.33

Temporary scaffolding affecting up to 20 metres length of a main river SR2015 No.34
Excavation of a wetland or pond in a main river floodplain SR2015 No.35
Installing and using site investigation boreholes and temporary trial pits within a main river floodplain for a period of up to 4 weeks SR2015 No.36
Removing a total of 100 metres of exposed gravel from bars and shoals over a 1 kilometre length of main river  SR2015 No.38
flood_risk_permits_main_river

Temporary dewatering affecting up to 20 metres of river SR2015 No.26

The dewatering structure shall be in place for no more than 4 weeks. The activity shall affect no more than 20 metres of the bank of the watercourse at any one time. The depth of water adjacent to the dewatered area shall not exceed 1.2 metres. The dewatering structure shall project into or over the main river no more than 10% of the width of the river. The top level of the structure blocking and diverting the watercourse shall be lower than the ground level on the landward side at the foot of the bank, on each side of the main river.

Installation of an outfall of 300mm to 500mm through a headwall into a main river SR2015 No.27

The diameter of the outfall pipe shall be 500 millimetres or less. The width of the watercourse at the location where the outfall is to be installed shall be equal to or greater than 10 metres from bank top to bank top. The total length of bank affected during construction of the outfall and headwall shall not be more than 3 metres. The height of the headwall shall be no more than 75% of the height of the bank or 1.5 metres, whichever is less. The gradient of the outfall pipe through the headwall should be less than 1:50 (fall in elevation:length). The outfall pipe shall be aligned to an angle of between 30° and 60° to the direction of flow in the watercourse. The outfall pipe route shall not pass through or under any remote defence, river control work, sea defence, raised embankment or wall forming part of the bank of the main river.

Installing a clear span bridge on a main river of up to 8 metres span and 4.2 metres width SR2015 No.28

The activity shall be commenced within three years of the date on which the permit is granted and completed within 3 months of commencement. The bridge deck shall be no wider than 4.2 metres. The soffit shall be at least 0.6 metres higher than the top of the bank on both sides of the river. The watercourse shall be no wider than 8 metres measured from the bank top on one side to the bank top at the other side, at the location where the bridge is installed. The bridge shall not be associated with, or lead onto or off, the public highway. The approach ramp or steps for the bridge shall not extend further than is necessary to allow a gradient of 10% (1 metre vertical for 10 metres horizontal) on the approach. The level of the land at each end and surrounding the approach ramp or steps to the bridge shall not be changed by the construction. The bridge shall be securely attached to foundations which are no closer than a distance of 1 metre from the watercourse.

Temporary storage within the flood plain of a main river SR2015 No.29

The materials shall be stored for no longer than 4 weeks and completely removed from the flood plain at the end of the activity. The materials shall be stored more than 8 metres from the watercourse for non-tidal rivers and more than 16 metres from the watercourse for tidal rivers. The materials shall be stored in connection with works carried out by the operator. The materials shall be stored adjacent to where those works are carried out. The materials shall be stored in heaps parallel to the bank, and every 10 metres there shall be a break of 1 metre between heaps.

Temporary diversion of a main river SR2015 No.30

The structure blocking and diverting the watercourse shall not be in place for more than 4 weeks. The flow rate of the diversion route shall be capable of taking the flood flow of the existing watercourse. The maximum width of the watercourse that is being diverted shall be no more than 8 metres measured from the bank top at one side to the bank top at the other wide The distance between the point where the bypass channel departs from the existing watercourse to the point where it discharges back to the existing watercourse shall be no more than 30 metres. If a temporary diversion channel is used it shall be no wider than the existing watercourse. The top level of the structure blocking and diverting the watercourse shall be lower than the ground level on the landward side at the foot of the bank, on each side of the main river.

Operating techniques condition - measures must be taken to ensure that fish shall be protected. The management system and method of work must address how the operator will plan to ensure fish will protected from high water temperatures and low oxygen levels. The method must include measures to reduce the risk of fish being affected by high temperatures and a plan for managing fish if the conditions in the channel become unsuitable.

Channel habitat structure made of natural materials occupying up to 100 metres of a main river SR2015 No.31

 The activity shall be commenced within 3 years of the date on which the permit is granted and completed within 3 months of commencement. The structure shall project into or occupy no more than half the width of the river channel and no more than 100 metres of the length of the main river. The top of the structure shall not exceed the height of 25% of the height of the bank above river bed level (excluding any wall or embankment forming part of the bank). The activity shall not include the installation of weirs and berms. The structure shall be securely fastened to the bed of the main river, the bank or both. The structure shall be made from naturally occurring woody material.

Do not carry out activity within 500m of designated nature conservation sites. Do not carry out activity within a Local Nature Reserves (LNR), Local Wildlife Site (LWS) or Ancient woodland. The operating techniques/management system must address how the operator will manage and minimise the silt arising from their activity. The necessary measures should be in place before works begin.

Installing an access culvert of no more than 5 metres length on main river SR2015 No.32

The culvert shall be no longer than 5 metres in length. The watercourse before the culvert is installed shall be no wider than 2 metres, measured from the foot of the bank in the channel on each side, over the full length of the culvert. The culvert shall be on a straight reach of the watercourse and aligned with the direction of flow in the watercourse. The slope of the culvert base shall match the slope of the bed of the watercourse. The culvert shall have at least the same cross sectional area as the watercourse does before installation of the culvert. The culvert shall be designed so that flood flows that exceed the capacity in the channel are able to bypass the structure and re-enter the watercourse downstream.

Repairing and protecting up to 20 metres of the bank of a main river using natural materials SR2015 No.33

The length of the bank reinforced under this under this permit shall be no more than 20 metres. The repair and protection works to the bank shall not encroach into the channel of the watercourse beyond the line of the bank prior to the activity being commenced. When the activity is finished, the height of the bank shall not exceed the lower of: (a) The height of the bank on either side of the works, and (b) The height of the bank prior to the activity being commenced. The activity shall be carried out using natural materials. It shall not involve the use of steel sheet piling, concrete, cement or concrete bagwork, brickwork, gabions, timber revetment or any other non-biodegradable materials. The repair and protection works shall be securely fastened to the bank at both ends to prevent erosion behind the works.

Temporary scaffolding affecting up to 20 metres length of a main river SR2015 No.34

The scaffolding shall be in place for a maximum of 4 weeks. The scaffolding shall not occupy more than 20 metres of the length of the watercourse at any one time. The width of the watercourse from the top of the bank on one side of the watercourse to the top of the bank on the other side shall be at least 4 metres, at the point where the scaffolding is installed. The scaffolding shall project into or over the main river by no more than 1.5 metres from the bank. The transoms and walking decks shall be set no lower than 600 millimetres above the water level.

Excavation of a wetland or pond in a main river floodplain SR2015 No.35

The pond or wetland excavation shall not be carried out within 16 metres from the watercourse. The capacity of the floodplain shall not be reduced by the activity. All spoil excavated in creating the wetland or pond shall be removed to outside of the flood plain.

Installing and using site investigation boreholes and temporary trial pits within a main river floodplain for a period of up to 4 weeks Permit SR2015 No.36

The activity shall be completed within 6 months of date on which the permit is granted. The activity shall be completed within 4 weeks of commencing. The boreholes and trial pits shall not be installed within 5 metres of the main river. All excavated materials shall be returned to the place they were removed from or removed from the flood plain entirely. The activity shall not be carried out in the channel or bed of the watercourse or on the bank.

Removing a total of 100 meters of exposed gravel from bars and shoals over a 1 kilometer length of main river Permit SR2015 No.38

Only dry gravels found above normal winter levels shall be removed. The activity shall not be carried out upon the same part of a watercourse where any removal of gravel has been carried out within the previous 5 years. The activity shall not be carried out where established vegetation is growing in or on the gravel, unless the vegetation consists solely of invasive non-native species. The activity shall only be carried out in the dry, leaving a buffer of dry gravel of a minimum of 0.5 metre inside the wetted perimeter of the bar or shoal. A minimum of one-third of the dry gravels shall be left undisturbed on the surface of each shoal at the upstream edge. A maximum of 100 metres of exposed gravels shall be removed.