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<br />Ditch Maintenance Guidance <br /> <br />FIGURE 4, Patchy Distribution of Shrub Vegetation <br /> <br />Determination of Maximum Allowable Disturbance Area for shrub vegetation <br />when the shrub and non-shrub habitat are intermingled or patchy. <br /> <br />Patchy Distribution Example <br />Three Patches along a 110 foot leng1h of ditch <br /> <br />~ <br />o <br />'"' <br /> <br /> <br />... <br />o <br />~ <br /> <br />Iii <br />... <br />::: <br /> <br />nTTrH <br /> <br />Diversion suucture <br />/? <br /> <br />Patch A <br /> <br />110 FEET <br /> <br />The following process is to be applied to each 110 feet of ditch: <br /> <br />Step I <br />Fiod tola! aIea. of shrub habitat <br />available = Sum of all Patches <br />Area of Each Patch = leogth x width <br /> <br />Example: <br />Patch A = 1500 sq,ft. <br />Patch B = 750 sq,fL <br />Patch C = 1800 sq,fL <br /> <br />Tola! = 4050 sq,fL <br /> <br />Step 2 , <br />Find 5% of tola! aIea of shrub <br />habitat available: <br />Tola! Area x 0.05 = 5% of available <br />habitat <br /> <br />Example: <br />Total Area = 4050 sq,ft. x 0.05 = 202.5 sq,ft. <br /> <br />Step 3 <br />Determine width of distubance <br />allowed (if disturbance area will be <br />perpendicular '0 the ditch), or length <br />of disturbance (if disturbance aIea <br />will be para1lello ditch), <br />5% of Patch ArealPatch width <br /> <br />Example: <br /> <br />Patch A -'if disturbance is perpendicular. <br />202.5130 = 6,75 fOOl strip of disturbance allowed <br />Patch B - if disturbance parallel to ditch: <br />202.5/50 = 4 fOOl strip of disturbance allowed <br /> <br />II <br /> <br />. <br /> <br />. <br /> <br />. <br />