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<br /> TABLE 6 (coa&'d) <br /> PIONEER DITCH <br /> 10- YEAR DISCHARGE PROFILES <br /> EXISTING VS. WITH PROJECT <br /> EXISTING <br /> CHANNEL DESIGN <br />HEC-2 SAND CREEK CHANNEL <br />CROSS & LOCAL FUTURE LOCAL <br />SECTION LOCATION DRAINAGE DRAINAGE <br /> (cro) . (cfo) .. <br />1120 140 875 <br />1130 State Highway 14 Culvert 179 560 <br />1140 170 560 <br />1145 Bridge 139 560 <br />1150 96 560 <br />1155 Phelps Street 220 560 <br />1160 200 465 <br />1170 120 465 <br />1180 Burlington Northern Railroad Culvert 120 365 <br />1190 120 365 <br />1200 322 365 <br /> <br />. <br /> <br />These discharges are from reference 2.2. They are irregular because bridges and low channel banks are <br />allowing flows to escape and later retwn to the channel. <br />These are desigu discharges that are contained within the improved channel with the detention pond in place. <br />They are regular and increase in the downstream direction lUltil flow is lost into the detention area. <br />This represents the approximate location of the detention pond and channel realigmnent options. <br /> <br />.. <br /> <br />... <br /> <br />3.3.4 It is clear from the tables above that the detention pond would relieve pressure on <br />the downstream bridges. Also, the detention pond in combination with the channel realignment <br />and improvements would allow more channel capacity upstream. <br /> <br />4. CONCLUSIONS <br /> <br />This study focused on providing technical information to the City of Sterling in regard to flood <br />reduction measures along Pioneer Ditch. Several measures/alternatives were identified: a detention <br />pond, a channel improvement option, and some bridge improvements/replacements. Although <br />Sterling is flooded by Sand Creek and Pawnee Creek overflows, these alternatives were designed <br />based on the future conditions 10-year local drainage flood described in the 1988 report by <br />Charles F. Leaf (reference 2.3). <br /> <br />13 <br />