Laserfiche WebLink
PROPOSED STORACG TN SCOTTLA4D CRLC6 iOND <br />The a[[ached drawing shovs prelLninary ce:i[ours Eor [he pond <br />area. The pond shape is based nn preliminory drawings by Development <br />Concept, Inc., chat have becn reviewed i y the f.ity and tha[ are Che <br />general basis for thc eite pl:mniug. <br />Control elcvations for che pundtn; area are 6ased in general <br />on physical constrnints a:: follows: <br />1. The low basement elevatlon in che Scottland Creen Apartments <br />is at 897.2 based on informacion develuped by Development <br />Concep[s, Inc. Using [wo fee[ of freeboard for the 100 <br />year s[orm event the design pond elevation will be about <br />895.7 <br />2. The present control elevation for the ponding area is a[ <br />the invert of a 36" diazneter culvert beneath a drlveaey <br />jus[ ro the east of fhe apactmen[s. This elevatlon is <br />891.5. The normal elevation of the proposed ponding area <br />should not be lover than 891.5. <br />3. Ice eleva[ion in Che outlet dStch ie et approximately <br />elevation 892.2. This elevation also existed during prlor <br />work by Sliort, Ellioet, and Hendrickson during summee <br />mon[hs. It 1s likely [hat the vater elevation ln [he <br />di[ch is the resulc of downs[remn channel con[rol Lt the <br />area be:ween Coun[y Road I and the Ridge I.ane storm seuer. <br />We expect tha[ [hls ditch vould be cleaned ou[ by [he CiCy <br />as aprt of development of che pond. <br />Following ie the volume-elevnHon r..lculu[Son fnr [he p[oposed <br />poad3ng area. The coacrol oz normal etevaelon ls assumed us 892.0 end <br />the mexlmum (100 year) level is assum d as 895,7. . <br />Area Volume Cumulative <br />Contour Acres A1 + A2 L/2 AF Volume AF <br />892.0 14.90 0.00 <br />16.G0 <br />31.50 1.00 31.50 <br />894.0 <br />18.60 <br />31.50 <br />40.02 0.85 34.02 <br />895.7 21.42 65.52 <br />Nota ChaC the above ealculation ee9umea thst the weeterly end <br />of [he pond w111 ba maintelned et e higher noimel level of 894.0. <br />This i in line with prelLoinery indicacione by che Cicy pereonnel <br />that e hlgher level might bs deeired.