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'I'he highest groundwater elevation among these three obser:vations was used to establish t:he deepest excavation possible for: the detention pond. The data available is sufficient. for this pre- liminary design; however, a longer observation period should be provided for the final design. Drainage System Along [~ayt~!!_St~eet:...~~:ut}:'_~.t ~sissippi Avenue (Mas':er Plan Drawin~~~: A "t:orm drain w1th capa.city for a 5-year design frequency was provided along Dayton Street South of Mississippi Avenue to collect t.he st:orm ',rater from thE' existing ditch which runs diagonally toward Deyton Street. This st:orm pipe could be used as part of the drainage system alonq Dayton Street after this area is developed. ~lage System Along ~entuC::.!sLJ?ri,-~:._ (JII[i'l~lr_R}a~l Dr.i'lw:~l1g No. 4), Dralnage Area No. 4 east of Havana St:reet 1S servE~d by the exist.. ing drainage system along Havana Street ',;hich was designed for the 10-y'~ar storm event. in commercial areas and the 2-year storm even': in residential areas. The exist:ing drainage system alonq Havana Street is a 66-inch RCP a.t a E;lope of 0.8 percent along t:he reach south of the Hiqhline Canal. 'I'he maximum capacity of t:his storm sewer is 300 cfs which is not adequate to accept the storm water from the area bounded by Mississippi Avenue, Geneva Street, Kentucky Drive,. and Dayt:Dn Street: (t:he Rangeview Area) . A drainage system was designed too cODvey the storm wa.ter from thE' 5-year storm event into the drainage system along Dayt:on Street, which is described below. prainage System Along [~ayton St.reet North of Mississippi Avenue (Masl:er Plan Drawing No.5): Th;~ dl~aTnage system alo.ng Dayton Stre,~t will serve the following purposes: (1) to collec t the stormwater from Drainacre Area No., 4 south of Mississippi Avenue and drain it into the Dayton Pond for detention, (2) t:o provide an outlet for the Dayton Detent.ion pc.nd, (3) to convey the i3torm-. wate:~ from the drainage system alonCJ Ken.tucky Drive t.oward the downiltream watershed, and (4) to serve the area along Dayt:on Street. north o:f the Highline Canal. The drainage system along Dayton Street would provide an outlet for i:he area south of Mississippi Avenue at the intersec'U.on of Mississippi Avenue and Dayton Street. Since most of t:he areas served by the proposed Dayt:on Detent:ion Pond has not. been de- veloped, if the Dayton Street storm drains are 1:0 be instaLled befo:~e the Dayton Detention Pond ,. a connection bet:ween 1:he inlet and outlet of the pond will be requi.rE,d. The required pi.pe size is to be determined in the final desicfn. .-22..