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<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 />I <br />I <br /> <br />It is hereby recommended that for basins that are larger than <br /> <br />about 200 acres, the unit hydrograph procedure method should <br /> <br />be used. <br /> <br />E. <br /> <br />IMPROVEMENTS <br /> <br />GENERAL <br /> <br />Due to the flatness of the terrain in the YUtnl area, it is not econo- <br /> <br />mically feasible to design a storm sewer system for periods greater <br /> <br />than the following: <br /> <br />I. A two-year design storm was used as a basis of street and <br />~- <br /> <br />storm sewer design. <br /> <br />2. <br />-< <br /> <br />Structures such as detention ponds and railroad culvert were <br /> <br />designed based on a 5-year storm. <br /> <br />It is recommended, however, that in the future when any parking <br /> <br />lot is paved or any new buildings are constructed, that storage be <br /> <br />provided in parking areas, grassed areas around buildings, and <br /> <br />on any roofs to hold excess runoff in order to relieve the general <br />~ <br /> <br />storm sewer system. <br /> <br />The proposed improvements included in this report consist of the <br /> <br />following: <br /> <br />15 <br />