A1(T) Elkesley Junction Improvements - Highways Agency
A1(T) Elkesley Junction Improvements - Highways Agency A1(T) Elkesley Junction Improvements - Highways Agency
NegligibleMinorBeneficialModerateBeneficialMajorBeneficialResults in animpact on attributebut of insufficientmagnitude toaffect the use /integrityResults in somebenefit effect onattribute or areduced risk ofnegative effectoccurringResults inmoderateimprovement ofattribute qualityResults in majorimprovement ofattribute qualityPotential low risk in Method CLoss of flood storage/increased flood peak by level (1% annualprobability) >10mmLow risk in Method A and risk of pollution from accidental spillages
Table 12.3 Criteria for Estimating the Impact RatingsMagnitude of potentialImportance of Attributeimpact Very High High Medium LowMajor Very Large Large/Very LargeLargeSlight/ModerateModerateVery Large/LargeModerate/LargeModerateSlightMinorModerate/LargeSlight/ModerateSlightNeutralNegligible Neutral Neutral Neutral NeutralSource: DMRB, Volume 11, Section 3, Part 10 HA216/06 Road Drainage and the Water Environment.Data CollectionThis assessment uses information from discussions with developers, designers andplanners; a review of associated correspondence and documentation; a review ofpublished maps and information; and the collation of data from the EnvironmentAgency (EA) in England.12.4 Baseline ConditionsSurface WatersThere are no fluvial watercourses or ponds within the immediate vicinity of theproposed scheme footprint. The only surface waters relate to local field drainageditches running along the edge of the A1(T).The nearest major rivers include, the River Idle/Maun to the east just beyond TwyfordBridge, and the River Poulter, running south of the A1(T) before flowing north andpassing under the carriageway to the east around Twyford Bridge where it flows in tothe Idle.Water QualityThe EA General Quality Assessment (GQA) scheme classifies water quality in riversin to six grades (A-F) based on chemical and biological parameters also graded A-F.Grade A represents the highest quality. Nutrients concentrations are also gradedVery Low to Very High.The Water Framework Directive (WFD) changed the monitoring and assessmentprocesses used for surface waters. This means that the GQA for 2007 and beyond isnot comparable to the historical GQA classification. Two set of data are thereforeprovided below, one post 2007 comprising ‘interim’ data and historic data collectedprior to 2006.The most appropriate EA monitoring point is located just downstream of the site onthe River Poulter; upstream of the confluence with the River Idle (grid reference SK69993.69 75294.75).97
- Page 45 and 46: • rolling landforms with numerous
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NegligibleMinorBeneficialModerateBeneficialMajorBeneficialResults in animpact on attributebut of insufficientmagnitude toaffect the use /integrityResults in somebenefit effect onattribute or areduced risk ofnegative effectoccurringResults inmoderateimprovement ofattribute qualityResults in majorimprovement ofattribute qualityPotential low risk in Method CLoss of flood storage/increased flood peak by level (1% annualprobability) >10mmLow risk in Method A and risk of pollution from accidental spillages
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