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<br />Basi:, of Maintenance Cost Estima'i:es: l1a.intenance required <br />1'0r .letention ponds, fJ:ood 'c'hann:;~ls Clnd conclui ts is descd.bed <br />in the previous paragraphs.. Table 10 present.s t.he maintenance <br />manpower, equipment needed and estir1C'.t:ed frequency. <br /> <br />Summ,~ <br /> <br />A hiqher capital cost of these dJ~a:LnaCJ2 and flood cont:rol. <br />improvements is expected because (1) thi:; preliminary clesiCJn <br />has longer box culverts: than .the Phase A report (approximately <br />500 ~t. longer), (2) trickle channels are provided in this <br />preLLminary design, (3) righ.t-of..way costs are included in <br />this preliminary design but: were not: included in t:he Phase A <br />report, and (4) Dayton Deten.tion Pond ita:; a larcler volume than <br />Miss:.ssippi'-Oayton Pone: proposed in Ul'~ Phase A report. <br /> <br />..36- <br />