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<br />structures that in most cases are not adequate for t.he major storm <br />runoff, and (2) runoff from the tribut.ary basin is increased by the <br />conversion of nat.urally pervious ground to artificial impervious <br />surfaces. These two concurrent changes to a basin and its drainage <br />channels are the essential elements in the creation of urban drainage <br />problems. <br /> <br />. <br /> <br />. <br /> <br />. <br /> <br />14 <br />