Loading...
The URL can be used to link to this page
Your browser does not support the video tag.
Park Place-CS 910530
L ,,~ M. rbowD~Y' AND ASSOCIATE !NC, Civik ENG!NEER$ i§250 DALt..AS PARKWAY ~U~3E 1~ DALES, TE~S 75246 {214) ~1-~ F~ (2~4) 931-95~ .... Mr Larry r)~vt s Chief tiI~''--~'- ~-- t City of Cop[ell 255 Parkway Boulevard Coppeli, Texas ';5019 ~e: Park Place Addition Storm Sewer 3' Drop Inlet. A!lencrest an~ Sandy Lake Road Dear Lar~y: Ba~ed o~' a fi. eld observation of the above referenced inlet, which is ccrrel, t]y under constzuction, I agree that the proposed top-ti-inlet ,>!evattoi~ Is cu:~'ently t~c, lo~. I reco~.men~ that %'e do the follo~.ing; 1 . Close the east, south and west encls of the proposed inlet. The i~orth end of the 1 ..... ~ ~.,~1.] remain open and to the elevation shown or. thc. plans. 2. The top of th~: J~iet ~'i[] be sloped ~o that the edge of subgrade al the asphalt pavem~.nt, top of asphalt (fl0.3), ~ubgt'ade of asphalt {609.8), to the ~outh top of inlet (608.21) is appr~.,x~.. ~+~'- a 5:1 slope {8' horizontal) and the top of the inlet is sloped to the c. urrently approved north end ,of the inlet {606.88). The slope '- acros~ the top of the in]et approxlmate]y 3:1. A[tached is a c:.rrohtly revised plan. ~be qu~ntit~ of water is fairJ..y ir~slgnificant a~ calculated below: Area = 0.90 C= 0.45 ~00 = 1~.6 in,,hr (10 min. time of conc~ntration) ~ 4.7 QI00 Thc graflir.9 In the vi~'nity_.] of the Inlet. will be done to 5.etch said improv ! Mr. Larry Da'~ s i May 30, 1 991 ~ Page 2 '., ..-_ Based on th~ abcx'e $ituattor'~, 2: ~espectfull~' r.equest approval to the modificatio?, of tho const~.uction Vury t~uis, ygu!'st DAN M. DOWDEY At{D t~S©C1A'['SS, William A. Anderson, P. E. WAA: hc Encl. ,J iI i !