RP32: Small leaky woody dams

How much willyou’ll be paidpaid 

£461.39 for each damdam.

WhereHow to use this item benefits the environment

ItLeaky iswoody availabledams forslow Countrysidethe Stewardshipmovement Higherof Tier,water Midafter Tierhigh rainfall and Capitalhelp Grantspush butwater only:onto floodplains. They can also increase the recharge of groundwater. This increases the temporary storage of flood waters within water channels and on floodplains, so:

• withhelps delay the supportpassage of flood water downstream
• allows sediment to settle out
• reduces downstream flood risk

This item can help you protect, recover and approvalimprove biodiversity on your land.

Where you can use this item 

You can only use this item with support from Catchment Sensitive Farming (CSF) either in:

• incatchments where permeable soils and geology allow for recharge (capture and storage) of groundwater
• catchments targeted for flood risk measures or water resource benefits

You can also use this item for either:

• fordams dams, in streams between 1 metre (m) and 2.99m wide

How

ephemeral thisstreams itemand willsurface benefitwater therun-off environment

Leakypathways woodywhere dams slow the movementoverall length of waterdam andrequired helpis pushless flowsthan onto10m

Catchment theSensitive floodplainFarming duringprovides floods.advice Thiswhere increasesthere temporaryare storagewater ofquality or flood watersrisk withinissues waterlinked channelsto andfarming. 

You outmay onneed toconsent from the floodplain,Environment helpingAgency, delay the passagelead oflocal flood waterauthority, downstream,or allowinginternal sedimentdrainage toboard settlebefore out,starting andany reducework. downstreamRead floodguidance risk.on owning a watercourse for more information. 

Requirements

YouCheck must:

• sendwith theNatural writtenEngland supportif andyou’ll approvalneed froma CSFfeasibility withstudy. yourSpeak application
• followto theCatchment indicativeSensitive drawingsFarming inabout thea Sectionwater 5holding choosingstructure capitalaction itemsplan. 

  What foryou maximummust effectiveness

do to use this item

You must:

• construct the dam from logs large enough to span the water channel and out on to the floodplain to provide a stable and long-lasting structure
• secure the dam in line with the requirements of the Environment AgencyAgency, orlead Leadlocal Localflood Floodauthority Authorityconsent or exemption (where required)
• align dams at right angles to channel banks or direction of flow to reduce bank scour (the removal of materials such as sediment from the bank)
• in streams (permanent or winterbourne), build dams to allow lownormal flows to always pass unimpeded – set them at all0.3m timesabove normal flow levels
• site dams on slow flowing reaches of the water course that have on average 2m of floodplain on either side
• build dams to a height sufficient to encourage water to spread onto the floodplain upstream of the dam
• buildnot damsinstall in series (minimum 3 dams) at a spacing between dams of about 5 to 7 times the width of the channel
• make sure dams are not installed directly upstream of pinch pointspoints, such as bridges or culverts that back up flows and are likely to swamp the dam
• check and maintain dams to keep the structure effective – ensure the free gap underneath has not become blocked by debris
• follow the requirements set out in any Feasibilityfeasibility Studystudy or Catchment Sensitive Farming (CSF)water Designholding Planstructure action plan (if applicable)

Keeping

Evidence records

Before you apply,must youkeep 

You must seekkeep advicewritten support from theyour EnvironmentCatchment AgencySensitive andFarming whereadviser relevantand theprovide Leadthis Localwith Floodyour Authority to check if you need consent to carry out the planned work.application. 

You must also keep the following records and supplyprovide them with your payment claim:

• photographs of the completed works in place and installed
• any consents and permissions from the Environment Agency/LocalAgency Floodor Authoritylead local flood authority

You must also keep the following records and supplyprovide them on request:

• receipted invoices,invoices or bank statements where a receipted invoice is unavailable
• photographs of site before works start
• a copy of the Feasibilityfeasibility Studystudy, or woodland management plan or Catchmentwater Sensitiveholding Farmingstructure (CSF)action design plan (Water-Holding Feature Management Plan), where applicable
• any consents or permissions connected with the work (in addition to the ones stated above)

PleaseRead see the record keeping and inspectionsite visit requirements asin setthe outAgreement inholder’s theguide: Capital Grants, Higher Tier, Midcapital Tiergrants orand CapitalProtection Grantsand guidanceInfrastructure grants for more detail.information.

AdviceOther anditems suggestionsyou forcan howuse with this item

You can use this item with RP11: Swales.

Advice to carryhelp outyou use this item

The following advice ismay helpful,help you to use this item, but theyyou aredo not requirementshave forto follow it to get paid. It’s not part of this item.item’s requirements.

DetailedThe design can vary and thelocation siting of leaky woody dams in natural water courses willare beaffected dictated by by:

• local circumstances andsuch availabilityas extent of ortree easycover, accessrisk toof importriverbed suitableor materialsbank toerosion
• whether site.Sectionit 5is choosingto capitalslow itemsflood hasflows detailsor ofto indicativeencourage designgroundwater of dams.

  Check recharge

• the damsavailability forof silt

  Yousuitable willmaterials

• easy needaccess to checkimport thesuitable dammaterials regularly and de-silt it to prevent it collecting large amounts of silt.

  Biodiversity

  site

ThisUsing the capital item hasFM2: beenCarry identifiedout ascustomised beingcapital beneficialworks forto biodiversity.manage Allspecific Countrysidesites Stewardshipor habitatspecies creation,is restorationmore andappropriate managementfor optionsuse arewithin:

• sites of greatspecial significancescientific forinterest biodiversity(SSSIs)
• rivers recovery,that as are thealready widebiodiversity rangepriority ofhabitat arablerivers
• rivers optionsthat inhave the scheme.potential Capitalto itemsbecome andbiodiversity supplementspriority canhabitat supportrivers

If thisone habitator workmore dependingof on the holding’sabove situationapply, andyou potential.

Theshould connectivityseek ofadvice habitatsfrom isyour alsoNatural veryEngland importantadviser andbefore habitatusing optionsthis shoulditem.

Detailed bedesign linkedcan wherevervary. possible.Local Bettercircumstances, connectivityavailability willof allowand wildlifeeasy toaccess move/colonise freely to accesssuitable water,materials food,for shelterthe andsite breedingcan habitat,affect andwhere willyou allowput naturalleaky communitieswoody ofdams bothin animalsnatural andwater plantscourses. toHigher adaptTier inannex responseC tohas environmentalexample anddesigns climateof change.dams.

Further information

You can improve the management of water on the landland, byimprove infiltration and the storage of water by:

• improving soil health
• increasing appropriate vegetation cover
• using rural sustainable drainage systems.

Catchment

Checking Sensitivethe Farmingdams (CSF)for providessilt

You’ll farmersneed withto freecheck advicethe dam regularly and trainingde-silt onit improvingto waterprevent andit aircollecting qualitylarge andamounts naturalof floodsilt.

Spacing management.between Seeeach guidancedam

It’s forbest furtherpractice informationto onbuild Catchmentdams Sensitivein Farminga (CSF)series support.(with a minimum 3 dams). Make sure the spacing between dams of about 7 to 10 times the width of the channel.

Large leaky woody dams

SeeYou thecan Higheruse Tier,RP33: MidLarge Tierleaky woody dams oreither:

• for Capitalstreams Grantsand guidanceriver tochannels findbetween out3m moreand about5m
• with theephemeral schemestreams (flows when it rains) and howsurface towater apply.
  run-off pathways where the overall length required is less than 15m