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<br />- 12 - <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />FLOOD POTENTIAL (Future Conditions) <br /> <br />futur <br />showe <br /> <br />e effects of watershed land use changes anticipated by county <br /> <br /> <br />plann rs within the next 10 to 15 years were analyzed in relation to <br /> <br /> <br />futur flood heights. Projected land use maps with designated residential, <br /> <br /> <br />comme ial, industrial. and open space developments were used in this <br /> <br /> <br />study. This information is especially useful for the areas In and <br /> <br /> <br />surro ding the communities of Erie, Lafayette, Louisville, and Superior, <br /> <br /> <br />Flood azard data developed In this report are based on exIsting channel <br /> <br /> <br />od plain conditions with runoff factors adjusted to reflect <br /> <br /> <br />developments. Comparison of present and future runoff data <br /> <br /> <br />Insignificant differences from projected changes in land use. <br /> <br /> <br />Ie for these results are: (1) Potential developments are located <br /> <br /> <br />lower reaches of the watershed where a slight amount of additional <br /> <br /> <br />has a minor effect on the magnitude of flood flows which create <br /> <br /> <br />100-year frequency flood, and (2) the major portion <br /> <br /> <br />ff originates in the upper watershed where a small amount of land <br /> <br /> <br />nge is anticipated. <br /> <br /> <br />upmost importance is the possibility of encroachment on the <br /> <br /> <br />existi g flood plains. Developments within the flood plain could obstruct <br /> <br /> <br />the fl wof flood water, raising the flood elevations, and create hazardous <br /> <br /> <br />veloci ies. Encroachment is a far more significant factor than the <br /> <br /> <br />additi nal runoff created by proposed developments. <br />