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northern border of the City. This creek is much narrower than <br />the Santa Ana River, and within the City limits is bridged by <br />one rail line and five roads, and has one surface-level crossing. <br />Because of the small segment of the City located north of the <br />creek and the relatively closely spaced crossings, the Santiago <br />Creek is less of a Harrier than is the Santa Aha River. <br /> <br /> Given the relatively minimal local relief within the City, <br />there has been little opportunity for any major alteration of <br />landforms. The changes that have occurred have, for the most <br />part, centered about the Santa Ana River and associated flood <br />plain drainage system. As was indicated in the previous sec- <br />tions, earthen levees have been raised along the length of the <br />river and the cross section has been modified. The Santiago <br />Creek has also been modified, with stone walls having been built <br />in several places, natural banks reformed, etc. However, the <br />Santiago Creek has not been modified to the extent as has the ~ <br />Santa Aha River. As a consequence, the Santiago Creek retains <br /> <br />much more of an appearance of a natural stream bed than does the <br /> _ <br />obviously artificial Santa Ana River bed with its frequently- <br /> <br />concreted levees. <br /> <br /> In addition, the formerly broad, shallow, often nearly in- <br />distinguishable intermittent surface run-off patterns have been <br />modified to form distinctive, regulated flood control channels. <br />These are normally somewhat deeper than the ori- <br /> <br />ginal channels and, in conjunction with subsequent . . <br />landfills and urban development, have resulted in <br /> <br /> <br />