design retaining walls,diversions and seepage drainscut and fill slopes of more than 9.1m but less than 12.2m in vertical height should be terraced at approximately mid-height.cut and fill slopes with a vertical height greater than 12.2m should be ter-raced at qpproximately equal vertical intervals about 6m apartunusual soil stability conditions may require closer terrace intervalsto assure vegetative establishment and maintenance
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