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<br />prevent overtopping and erosion damages. <br /> <br />streets not orienteq along maximum slope may <br />, <br />experience erosion along the down-fan side. <br /> <br />Effectiveness <br />When combined with houses <br /> <br />raised on armored <br /> <br />fill and diversion d~kes placed upstream of the <br />development. stree~s can safely convey the <br />entire flood flow. I <br /> <br />Effectiveness <br /> <br />is d~pendent on the hydraulic <br /> <br />capacity of the di~es and streets. <br /> <br />Smooth <br /> <br />, <br />connections between' upstream and downstream <br />I <br />streets with no shatp bends o~ blockages are <br />essential to a safe 4esign. <br />Physical model results (Part II. Section 5.3) <br />show this to be a very effective management <br />tool for new subdivi~ions. <br />Safety hazards due. ~~ extremely high velocities <br />(in excess of 20 feet per second) a~e serio~s: <br /> <br />Public Acceptance <br />Poor. due to probl$ms with aesthetics (each <br />street is a concrete lined channel). access <br />from driveways. and ~afety. <br />Aesthetic problems can be mitigated by <br />landscaping curb and 'wall areas. <br /> <br />Added <br /> <br />costs <br /> <br />of Istreet <br />smal~ for new <br /> <br />orientation and <br />developments and <br /> <br />depression are <br />can be paid <br /> <br />by developers. <br /> <br />The cos t <br /> <br />of <br /> <br />depressing streets in existing developments <br />would be large. <br /> <br />Required Maintenance <br />Inspection. <br />floods. <br /> <br />r-epair, <br /> <br />and debris removal after <br /> <br />83 <br />