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VI. MAJOR DRAINAG!~\iL\Y ::,"lPFOVE~'IEN!eS The selected alternative too thEl r,lajor crainc.geway improve,- ments was briefly describE:a in :3ecU: on II. ThE, design cri':eria used for the improvement:s v:ere presented in Sec':.ion V. The detailed'descriotiOLs o[ the master pla,'l dralvings (Volume II) and t:he proposC'd :improvemE,rt:s arc nresent- ed in tl1is section starting at. the Lpstream end of teClO '.mtershed. Dra:..nage Area No. 1 ar~d Nc~,-_-2 The~;e two areas were 6.esignated as 1:ledtherRidge and Pond C in t.he Phase A rE'port. Inthes,O! ar"!2;3 Fond C, Pond Dan:: a concrete'-lined flood channel !ldve been constructecl by thE: Ci ty of Aurora and llave allE~via.ted f loodinq probler,ls in these areClS. Eased on our Phase A st.1.lcie.!' , t'12re arE' no irnprovemen ts required. The system is capable of con.I:3.ininq at. least: t.he 100-.yr flow completely ~Jithin the Ponds and .the channel except for minor overflo~l from Pond C I"h:l.c:-' ',v'''Cltually reClchE:s t:hE' channel downstream. Drainage Ar,"a No. 3 and No. 4 -------- These two areas were designated as Wirld~:iJr Lake and Hav2lna Street in the Phase A report. Drainage and flood control improvements in these areas werE: mod ifi (~d according .~:o t:he suggestions described in Seceion II. !Jayton Detention Pond ('1as!~''!~~~:~~J~t:.~'::Ici:ng YI(~,~.L' A neW site for the detention pond was selected at the intersection of Dayton Street and the Highline Canal necause this site has enough capacity to contain the flood ~ater from part of Drainage Area No. 3 as well as cart of Drainage Area No.4. The relocation of 'I:he detent::i..on pond from the southeast corner of Dayton St:rE~et and. Miss iss.i.pJ:: i /I..venue, as pro?o3(~d in the Phase A report, to .t.he above.-mccntionecl location pro- vides an economical solution to the drainage problems of thesCl two drainage areas. The outlet of the Dayton DE"tent:ion Pond : s a 3().-.inch RCP which is connected to the drainaCfe sys I:E,m alone: Dayton StrE'et. The :Jay-ton Detention Pond is desiqned to contain a lOO-year flood without emerS'ency spillway ove:cflov: for (1) all of Drainage Area No.3 (except 0.16 square miles west o~ Windsor Lake and South of the Highline Canal, SE'," di~';cl1s iiion of DJ~awing No. 17, be 10'<, , and windsor Lake itself) and ":2) Drainaqe Area No. 4 sout:'l of Mississippi Avenue - Drainage Area No. 3 drains naturally t:::Jward the north, bLlt: 'the area located immediately sout'fJ. 01' Windsor Lake and north of Miss:~ssippi. AvenUE~ is a ponding a.rE~a b'::!C,~J,lSE~ of t.:le high -.20.-