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� � . <br /> � Paye 17 <br /> 1•9r. fieJ�ry F, ;=7uhi_ch <br /> � September 6, 19�77 <br /> � Page Two <br /> � " <br /> for �ulver_ t m��.nten��nce and �aou)_d r_E�qtzi_re 110 co»strtzction on <br /> � private property since the entire struc�ure could be contained <br /> within the county right-of-way. � <br /> � • <br /> • Tl�e proposed spillway altitude is 930. 0 M. S .L, with a narr_ow, <br /> rectangular r�otch i_n the spillway to altitude 9?_9. 0 M. S . L. <br /> � for the purpose of fl.ushing the existing pond between C. S .A.H. <br /> No. 51 al�d T,ake i�ii_nnet�nka. �l}1is wou]_d provide 30 lirzeal feet <br /> � �f di�>�.l�arge spillway which would exceed the culvert capacity. <br /> � 't'he si.r�_lctlire descri.l�ed would provide rtinoff storage with no <br /> . 5ignificallt capacity for lake augmentation. r4anual cont.rol <br /> could be added at any time which could achieve_some augmeni_a- <br /> � tion. Spill_way height could al.so be changed with relai.i_ve <br /> ease if warranted. Gae suggest these possibil_ities be reviewed <br /> � after one or two years of experience with a fixed crest at <br /> altitude 930 . 0 M. S_L. <br /> � <br /> . 'ihe history of water l�vel observations on French Lake is in- <br /> ade;uate for predici�ing precisely the max�mt�-n ponding levels <br /> • with a structure spillway at 930. 0 M.S .L. It is anticipated <br /> that maximum ponding will not exceed the levels reached under <br /> � c�xisting conditions but that those levels will be sustained <br /> ror longer periods with the proposed structure instal]_ed. <br /> � Tn the absence of detailed topographic knowledge we would <br /> � suggest that drainage easements specify a maximum elevation <br /> of 932. 0 M. S.L, for the French Lake basin, If legally feasible, <br /> • there could be allowances for future release of portions of <br /> this easement when and if future experience warr_ants such a <br /> � revision. <br /> � Sincerely, - <br /> � EUGENE A. HICKOK A�ID ASSOCIATES <br /> . Engineers for the District <br /> C_ � � A t� <br /> � � . �_��....-�-.�. <br /> .�. <br /> � E. A.-Hickok, P.E. <br /> � r,AH/cml <br /> � cc: Board of Managers <br /> • G, riacomber - r1C�17D <br /> S. Jacobs <br /> � , <br /> r <br /> � <br /> � <br /> � <br /> � <br />