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<br />Improved storm drainage <br /> <br />Reduced damages from flooding, <br />increased stormwater flows <br /> <br />Deepened commercial wells <br />Recharge wells <br />Wastewater reclamation <br /> <br />Lower pizometric head <br />Rai se pi zometri c head' <br />Recharge aquifers <br /> <br />Quantifying the Effect of Urbanization <br />In planning storm drainage systems, one obviously has to plan for <br />system performance for the conditions that will obtain when the system <br />will be in existence. It, is therefore quite important to have technology <br />available for determing the effect of urbanization in quantitative terms <br />and to be able to predict system performance under these conditions. This <br />requires quite different analyses from planning major projects becajlse <br />historic streamflow records are no longer accurate indicators of what can <br /> <br />be expected to occur in the future. Quite detailed and at times controversial <br />analyses are required to develop the quantitative base needed for the planning <br />of the storm drainage system. <br /> <br />There is agreement on t.he general effect of urbanization but <br />considerable difference of opinion as to the magnitude. Most, if not <br />all, investigators indicate thilt runoff will increase, but the specific <br />magnitude of the increase is debated, A recent report (4) prepared by <br />the U. S. Geological Survey for the Houston, Texas metropolitan area <br />indicates the gener'al order of magnftude of the effects of urbanization <br />on floods, The report states that the peak flow increased by a factor <br /> <br />10 <br />