Inspection

Tree hazard assessment

Un arbre magnifique au-dessus d'un pré vide n'est pas un danger. Un arbre médiocre au-dessus d'une cour de récréation en est un. C'est toute la logique de cette évaluation de type ISA/TRAQ : le risque naît de la rencontre entre un défaut et une cible, jamais de l'un ou de l'autre pris isolément. La grille examine les caractéristiques de l'arbre, sa santé, les conditions du site, la cible exposée, puis les défauts eux-mêmes, avant d'aboutir à une cotation et à des recommandations. Elle s'adresse aux gestionnaires de patrimoine arboré, aux collectivités et aux exploitants de sites recevant du public, à qui elle donne une trace défendable de ce qui a été vu et décidé.

control points
78
anchored clauses
0
Clauses covered
7

Clauses covered

Tree characteristics4
Tree health8
Site conditions14
Target4
Tree defects14
Hazard rating4
Recommendations8

Scale

Generally symmetricalMinor asymmetryMajor asymmetryStump sproutDeclining crownDominantCo-dominantIntermediateSuppressedYoungSemi-matureMatureOver-mature / senescentCrown cleanedOver-thinnedToppedCrown raisedPollardedCrown reducedFlush cutsCabledMultiple pruningsNoneNormalChloroticNecroticYesNoSparseSmallExcellentAverageLowFairStakesWires / tiesSignsCablesKerb / pavementGuardsResidenceCommercialIndustrialParkOpen spaceNaturalWoodland / forestRoadsideRaised bedContainerMoundLawnShrub bedWindbreakN/AConstructionSoil disturbanceGrade changeLine clearance pruningLand clearingAdequateInsufficientExcessiveWaterlogged trunk0%10-25%25-50%50-75%75-100%DrainageShallowCompactedDrySalineAlkalineAcidicLow volumeDisease focusHistory of failureOtherLightingSignageLine of sightViewOverhead linesBuried servicesTrafficAdjacent vegetationIsolated treeBelow the canopyAbove the canopyRecently exposedWindward canopy edgeWindthrow-prone areaEastWestSouthNorthBuildingParkingPedestriansRecreationLandscapeHardscapeSmall featureUtility linesOccasional useIntermittent useFrequent useConstant useSevereModerateUnnaturalSelf-correctedAnnualHalf-yearly1 - low2 - medium3 - high4 - severe1 - < 15 cm2 - 15-45 cm3 - 45-75 cm4 - > 75 cm1 - occasional2 - intermittent3 - frequent4 - constantRemove the defective partReduce end weightClean the crownThinRaise the crownReduce the crownRestructureShapeRoot collarDecayAerialMonitoringTo be assessedOwnerManagerCompetent authority

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How this grid is built

Every control point is written in our own words, then tied to the standard's clause number. The normative text is never reproduced: the standard itself remains to be purchased from the body that publishes it. Grids are reviewed at every new edition of a standard.

Published by NormePulse — HEMC, management consulting firmUpdated

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