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W q(fc'V ’ "'/-■■-l^'■^;Si£g <br />/^.-.. •-■•: . - •: ^ * . <br />Mmm <br />irv-'?A <br />:. .' _; ■. .* <br />• I ^. • <br />■•1?< <br />Xy ;A: <br />l-Tl* <br />/ <br />[XiX <br />u:v^q <br />\zr Xt: - <br />f ■/•• •• : . <br />'u.-. '.v <br />y::y ; t • <br />Him <br />•'>'*? <br />;:' ■ ''r:Xh <br />w^•W .- i. •. /:6*' Hli r0.-:.^■Xi' ' .>;<■Jp.XMMXxmi '.> -<vi”/-,8CHOELL & MAOSON, INC.~ dENGINEERS • SURVEYORS • PLANNERS SOIL TESTING <br />10B60 WAYZATA BOUL^VAnO • MfS»g6TOSKA. MN aOa43-(54esi <br />(61^ S40>7eoi • PAX (Bisi grte ei oeo <br />Nay 3, 1989 <br />Hr. Hike Gaffron <br />City Planner - Orono <br />P. 0. Box 66 <br />Crystal Bay, HN 55323 <br />Subject: Lauer Homes, Inc. Site <br />Drainage Basin Deign and <br />Site Grading <br />Dear Hike: <br />Enclosed for your review and comnents Is the proposed grading and drainage <br />plan and hydrology calculations for the subject project. Included on the <br />grading and drainage plan ts the detention basin required by the City. Prior to <br />designing this basin, we re-surveyed the proposed basin area and discovered a <br />large stand of 8" plus diameter trees located In the most feasible spot to <br />construct the basin. In order to keep storm water runoff from continually <br />ponding In this stand of trees, we designed the basin In such a manner that <br />ponding would occur only during the more Intense storms (10 year return <br />frequency or greater). To minimize ponding In the stand of trees, the detention <br />basin design volume Is somewhat less than the volume suggested by Glen Cook. He <br />feel, however, that the proposed basin provides a viable solution to your <br />concerns. <br />A summary of the hydrology analysis Is as follows: <br />I.Hethod of Analysis: Soil Conservation Service TR-55 Tabular <br />Hydrograph using a 24-hour storm event. <br />A. Drainage Area: 11.81 acres. <br />B. Curve No.: 61, Golf Course, woods and brush <br />II. 10-Year Frequency Storm Design: <br />Precipitation - 4.3 Inches <br />Peak Inflow to Basin - 9.0 cfs <br />Peak Outflow to South - 2.4 cfs <br />Mater Level In Basin - 975.8 <br />Haximimi Volume of Water Detained In Basin - 13,000 cubic feet <br />AFI=WMAT1VE acton • EQUAL OPPORTUNTPi' EMPLOYER <br />m'myA-- ■■ <br />m- <br />% <br />. .y- y <br />"W V <br />mxM'i <br />^ ^ -JvVrnmcM <br />1: <br />r. ^ :•. .Tti . <br />1. ';*‘VSv^S'n <br />^. A <br />I <br />iiyyy <br />hM- <br />Si'. <br />' ^v. <br />Mm.i <br />.V r-:- >.V m-' <br />y-yyy <br />y’- .’Mm <br />.»> . ••.^.r <br />3jtkv .r <br />>;xv: <br />pmmtmy <br />'■P-m <br />■■■:■/ ■'■? .m.- :■ <br />■rmX:Z^^>a <br />yyym.-py^rym:.y.ymz <br />tL.:; ■■ ^1 <br />.r ..■••••=:vx;’Pi '■m fmmmzT-M-w ' <br />n <br />'. ’A <br />tX: XiU <br />t|p yzXMm <br />-:r. , ■ v;;s:v:r:K:xxxmm • '•• ■.-■..■■.yi <br />n’ <br />- <br />..if <br />4 <br />.X‘ <br />pm <br />s#-.:mWXXXi:. <br />ipap®l <br />mzx:Mn0mx^x <br />h ■■- Xzy:X-y-: XX:x <br />XmSZym <br />■'\ Zi :■■' ,■ z :■.' :i < :mXXXX::[,-z <br />. ; • • ■ i.:v-> = - ;,, i -i V. • <br />" . :•■■ ■ ■ •*