construction and refurbishment of earthen irrigation channel banks

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20.4.1.1 StrippingWith outside bank re-construction, stripping actually takes the form of benchingto prepare a suitable shape for the placement of new bank material. Depth ofstripping to a reasonably solid impermeable base will depend on site conditions.The width of the bench will depend on the bank cross-section, the width ofconstruction equipment or the access required for trucks. The stripped material isstockpiled clear of the finished bank toe or run into the old borrow pits (ifexistent). Sufficient bank width is left to hold water in the channel whilereconstruction is completed. Short sections only should be opened up at a time tominimise the risk of banks failing in the process.Figure 20.3Existing deteriorated bankApproximately500mmMinimumof 200mmOld bankremovedFigure 20.4Outside Bank Remodelling – removal of old bank and strippingAcquisitionBoundaryAccess TrackCrushed RockProtectiveCoverNatural Surface1.513500mm1 in 40Compacted BankApprox500mmFreeboardBatter StabilisationMaximum 1:2 slope2-3mStrippingExisting BankMaterialWaterwayexcavation,if requiredFigure 20.5Re-constructed bank & re-establishment of inside batterConstruction and Refurbishment of Earthen Channel Banks August 2002 - Edition 1.0 20-10
20.4.1.2 ExcavationExcavation may comprise full or partial waterway enlargement, or may beconfined to re-shaping of the batters.20.4.1.3 Compacted BankMaterial that is suitable for construction of bank is obtained from borrow sites.Sites are selected after testing of soil samples and agreement with landholders onsuitable locations for borrow sites.Excavation can be carried out with either bulldozer and loader or hydraulicexcavators. Material is transported to the channel bank by tip-trucks and placedon the prepared bank seat in layers. Each layer is spread and trimmed by thebulldozer and watered if necessary to ensure correct moisture content.Compaction can be achieved through loaded trucks and bulldozers passing overthe layers, or by compaction equipment such as sheepsfoot rollers. Material isplaced, compacted and trimmed in successive layers until the re-design height andwidth of the compacted bank are achieved. The diagram in Figure 20.6 illustratesthe construction cycle for a typical compacted bank.Channel BankBulldozerspreadingWatertankerTip-truckunloadingTip-truckloadedTip-truckemptyBorrow pitTip-truckloadingExcavator or Bulldozerand LoaderFigure 20.6Typical compacted bank re-construction cycle20.4.1.4 Haul RoadsHeavy Truck traffic between the borrow pit and the work site can causeaccelerated deterioration of public roads and the trucks must be kept within thelimits of their gross vehicle weight.Prior to commencement of haulage on public roads, the Road Authority shouldbe advised.Construction and Refurbishment of Earthen Channel Banks August 2002 - Edition 1.0 20-11
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Your comments on the format and con
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During the course of this project,
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AcknowledgmentsThese Guidelines rep
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FundingFunding of this project was
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Table of ContentsBook 1SubjectPage
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1. Introduction1.1 GeneralGood asse
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(iv) provide proven practice approa
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3. Research Procedure3.1 Terms of R
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4. How to use these Guidelines4.1 W
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6. Units of MeasurementQuantity Uni
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8. Earthen Irrigation Channels8.1 D
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8.3 ReferencesAustralian National C
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9.1 IntroductionA key input to adva
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Data from Goulburn-Murray Water’s
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General 1 2 3 4 5 6DescriptionRisk
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Channel BankSequential Deterioratio
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9.2 ReferencesGutteridge Haskins &
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10.2.3.1 Dispersive layer of materi
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Causes ofSpecific factorDeteriorati
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10.1.2.5 BendsA bend in the channel
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10.1.4.1 Construction techniqueIrri
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10.1.5.4 Overtopping of banksIn ade
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In the past maintenance techniques
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Maintenance is a continuing require
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10.1.7.4 Yabbies/fresh water crayfi
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Direct removal ofmaterial by entrai
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Figure 10.10 shows longitudinal cra
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10.2.3.3 Irregular compaction - bri
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10.3 ReferencesEmerson W (1996), pe
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11.1 GeneralThe Investigation and P
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iv) Available fill materials and, w
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12.15 Radius of Bends .............
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There are several ways a channel ca
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• Land acquisition extent and typ
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The investigation should generally
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• Backfill: 10% compaction factor
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1. Flow Area, A, is the cross-secti
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after ageing and weed growth. If an
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elationships may be the controlling
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These maximum velocities should be
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Thus channels are usually designed
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Some of the design issues that shou
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12.12.1.3 Best PracticeEither of th
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12.13.2 Channel MaintenanceIncrease
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along a channel. The depth of the w
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12.13.4.7 Change of AlignmentThe in
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12.15 Radius of Bends12.15.1 Flow A
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12.16 Channel Cross SectionThe cros
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Some irrigation authorities use one
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12.16.2 BanksChannel cross sections
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Unless the bank is very high, the s
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The stability of channel batters ca
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drop bars become difficult and time
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Both the height above the bed and t
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• enable maintenance of the chann
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- Access agreementsA description of
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13/08/02 19:2012.20 Channel Tenure
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13/08/02 19:20As with the damage to
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13/08/02 19:20Advantages of Protect
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- gates provide a better deterrent
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13/08/02 19:20When considering expo
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13/08/02 19:20A typical design draw
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13/08/02 19:20Sinclair Knight Merz
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13.1 IntroductionIn many irrigation
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For example, the initial constructi
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13.2.6 When to use Life Cycle Analy
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The timing of the life-cycle costin
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• assess cost of collecting missi
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Microsoft Excel has quite a good pr
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The costs used in these methods sho
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Life CyclePhaseInvestigationDesignC
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Life CyclePhaseMaintenanceRehabilit
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ReplacementProject managementInvest
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Residual valueLegal feesInsuranceAd
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13.4.6.2 Recurring CostsChannel con
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$1.00.80Percent ofValue of$1.00.60.
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13.4.11 Evaluate ResultsThe results
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13.6 Tipsthe way open to incur sign
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14. Risk AnalysisTable of ContentsS
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Consequences for irrigation authori
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15. Material Selection and TestingT
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c) Shrinkage - will the bank crack
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depth. For this reason, the soils o
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Natural moisture content should als
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The study identified some confusion
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15.4.2 Determination of the plastic
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1. Preparation of PatTake approxima
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EmersonClass No.Degree ofDispersion
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15.7.1 Coarse grained soilsIn this
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sufficient gravel for erosion resis
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GroupSymbolsSuitability for Earthen
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The uniform application and thoroug
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essential that the chemical is thor
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Where laboratory testing facilities
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Clays are the plastic fines. They c
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etween the soil sample and the wate
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16. Compaction ControlTable of Cont
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16.1 PurposeDuring this research pr
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All compaction equipment utilises s
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The soil density required for a cha
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In the past, a method specification
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Low permeability and high stability
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16.10.1.1 Tamping Foot RollerTampin
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16.10.1.5 Non-Circular Impact Rolle
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16.10.3 Compactor OperationsAfter t
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16.11.4 Moisture Content ControlBef
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16.12 Density Control Tests and Pro
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Correlation with local materials an
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The main advantages of the Nuclear
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Figure 16.4Hilf Density Ratio Repor
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The location and test results for e
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16.14.3 Reporting and RecordsTest r
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16.16 Tests for small projectsThe s
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The advantages of the Drop Test are
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AS1289.6.3.2-1997AS1289.6.3.3-1997A
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17. Protective CoverTable of Conten
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The bank dries and cracks from the
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17.5 Specifications17.5.1 GravelPar
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17.6 Establish Vegetation CoverTops
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Species Growing Conditions Establis
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17.7.2 Rope Wick ApplicationMuch of
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There are a number of fibre mats or
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17.10 Australian StandardsAS1289.3.
Page 250 and 251: 18.1 IntroductionFor many earthen c
Page 252 and 253: When re-shaping the batters of exis
Page 254 and 255: LifeCrestOld bank lineBattered bank
Page 256 and 257: Photos\inside batter\CG7channel2arm
Page 258 and 259: 4. To help place the rock material
Page 260 and 261: False ToeFigure 18.8Protective laye
Page 262 and 263: The confinement system would be adv
Page 264 and 265: • Able to survive during non-oper
Page 266 and 267: 18.6 ReferencesHutchison D & Locke
Page 268 and 269: 19.20 Guidelines on Field Quality C
Page 270 and 271: Construction and Refurbishment of E
Page 272 and 273: • Figure 19.2)3. Temporary Bench
Page 274 and 275: The capabilities and limitations of
Page 276 and 277: 19.3.1 Construction EquipmentThe ba
Page 278 and 279: construction. The aim of scarifying
Page 280 and 281: Whether or not a front-end loader o
Page 282 and 283: The thickness of each layer will va
Page 284 and 285: distribution. The use of alternativ
Page 286 and 287: 19.8 Construction RecordsAdequate r
Page 288 and 289: 19.12 Protective Cover on Crest and
Page 290 and 291: 19.21 Australian StandardsAS 1726-1
Page 292 and 293: 20.1 ScopeAustralia’s earthen irr
Page 294 and 295: Bank re-construction normally requi
Page 296 and 297: •meter outlet locations and type
Page 298 and 299: In the case of channel bank refurbi
Page 302 and 303: All public roads to be used by truc
Page 304 and 305: 5. Material is delivered by trucks
Page 306 and 307: Need to drain and de-waterEBM befor
Page 308 and 309: significantly and a more conservati
Page 310 and 311: Aim for crest width ofabout 2 metre
Page 312 and 313: Refer to Section 18, Inside Batter
Page 314 and 315: 21.8.10 Re-alignment ..............
Page 316 and 317: Seepage is a complex hydrologic phe
Page 318 and 319: 2. Seepage losses increase as the d
Page 320 and 321: Refer also to the following section
Page 322 and 323: 21.4 Channel Seepage ConsequencesSe
Page 324 and 325: Channel seepage is one of the sever
Page 326 and 327: Seepage is proportional to soil per
Page 328 and 329: Methods based on vertical flow meas
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Page 332 and 333: Flow NetsA flow net is a system of
Page 334 and 335: Data from indirect measurement proc
Page 336 and 337: (ii) EM SurveyElectro-magnetic (EM)
Page 338 and 339: The volume of waterloss from the dr
Page 340 and 341: 21.7.3.2 Inflow-Outflow Method (Dyn
Page 342 and 343: Imperfect seal will cause the meter
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Page 346 and 347: Stable IsotopesThe basis of testing
Page 348 and 349: To be most successful, there needs
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21.8.6 Surface interception drainag
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KeyWatertable before tree plantingW
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• The preparation of a best pract
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21.11 ReferencesAustralian National
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22. Channel LiningTable of Contents
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22.1 IntroductionThe conservation o
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The different types of channel lini
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Table 22-1Unlined Earthen Channels
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Lining of channels will not elimina
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To supply a given discharge, the cr
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22.4.5 Structural SafetyThe stabili
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soil pressures and under-drainage i
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Concrete linings are suitable for b
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22.5.12 Availability of Constructio
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esistance to erosion. To improve th
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Construction and Refurbishment of E
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22.7.1.2 General Design Considerati
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22.7.1.4 Lining ThicknessThe thickn
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particular problems, but in smaller
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Where the earth lining finishes abo
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control where the channel material
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sand requires about 5% cement by we
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22.7.6 Soil SealantsSoil sealants a
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22.7.7 Cost of Earth LiningsThe cap
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Although they can assist with shear
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22.8.2 Membrane Liner TypesGeomembr
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Polyethylene has also appeared in m
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FPP resistance to common chemical e
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The base coat and seal coat rates m
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A common and misleading argument is
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These thermal expansion and contrac
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Another factor is the ability to ha
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Some lining methods expand and cont
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22.8.9.1 Geomembrane ThicknessThe t
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Cover typeThickness ofEarth fill(m)
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22.8.9.5 Cover MaterialGeomembranes
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As well, velocities which are permi
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22.8.11 FencingWhen livestock, part
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22.10 ReferencesAlther GR (1987), T
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23. Measures to Reduce the Rate ofD
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Channel DesignBank MaterialDeterior
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Stock and VerminAdjacentlandholders
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To ensure that a channel bank has a
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Advantages of Draining• Allows fo
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To efficiently maintain a channel,
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Compared with other countries where
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23.4.7 LeaksTransverse cracks are t
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23.5 Reduction of Deterioration due
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Photo 23-1Channel bed showing mumbl
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Thus, control of carp by draining c
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The disadvantages of a biological c
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Carp have been blamed for erosion o
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Management Groups gives guidelines
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Organisation Contact Details Aims/A
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Chemical treatment is often recomme
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23.7 Reduction of Deterioration due
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Grey Parrot Pea - Dillaynia cineres
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Lodge G (1998), Review on Fish Barr
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cation exchange capacity (CEC) a me
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fetch the distance over which the w
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plant term used for construction eq
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supply level the supply level is a
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