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J u � ��' '� `^-'�� ��� i��4p.rrlc 8HKK ztMa'1 N�ER 1 NG �� � 612 A32 2601 TO 94738696� � � '�P�02i�2 'J _ � 1 <br /> ^i. ., a <br /> �� , • ••, . <br /> „�,� �?QO Na�na�t CenArOr�v 353 l�rt?T(h Sbeec <br /> A�1n08AoG�MN 55437•r026 1�Deng�MN SS74b <br /> �l(]I`1Bff1�C0111�}/ F���S��j s32,26171 f�R�N Z623� <br /> july 10, 1995 <br /> . T�-� ��� � <br /> � ���. <br /> Mr, jae OEfenman • . <br /> 1669 N. Farrn Road ' <br /> Long �.ake,IVIlV 55356 • � <br /> � � R�: �Iood X,e�rel of Pond � ��,,, �� <br /> .._-. <br /> Dea�r Mr. OHermEut: � Y ,�, . �,c��...c-S <br /> . • � <br /> jh'e k,ave rev{�wed th� infornnation 5,�,�� �� Pesek has subm�ttec3�as well as informalion <br /> collected by Ricic Lestlna of our firbn during his yieit to �our prnpexty�ztst week. The <br /> puzpose o#our rev;(ew was to es�snate the 100-year Elood level in ozdez to set zx�lydm�un � <br /> btiildin8 elevations on th� adjacent property. <br /> 'I�te pond haa � very ynaall tributa,r},area and would be expected to ha�ve a very sr.nall flood . <br /> iticzease. If we aseume that the culvert is open arid Eunctional, the lOd-year flood level � <br /> wou]d be 0.7 feet above the ptpQ invert or approximatea� 987.4, Tiowever, it i� beconni�,g <br /> standard pYactice In flood control to avoid relylztg upo�► a single ev.(rr�r�, ur�less it i5 � atajor <br /> structure with a de�ined ma.iz►tenutce.program, yvhen Mx, L�9}� mado his inspecdon, the <br /> calvert was complet�ly piugged with sedimerit at the upstream ezid. GroundwaEer inElow <br /> �nd long-term runof# could ralse the level of the pond sig�tifica�nkl�+ �bove 987,4 if the pipe is <br /> plugged. Mr, Gaffron of the Ctty of pronv stated th�t he would prefer thar the minimuxn <br /> bu.ildu'+g ete�vQiion be above the zuttout level since standazd maintenaxtce pzocedures cannot <br /> guarantte thaf the culvert will alwa�s be kept open. ' <br /> Based on this informatloz�, I wouid sug�est that the m.inimv� builctiz,g elevation be sct three <br /> lnches above the rt,nout elevabi4n over Lor�g Lake Road <br /> . 8asad on ehe topa�apF,;c map this would be Elevahior1991,5. Because of the accurary <br /> limitaHons of the topagraphic maps, Z would have the builder zefexence the actual minlrnu,m <br /> b+sllding elevation to.the ovezflow point of the ro�d'when construcb;on begins. 1 should also � <br /> note that� second overflow route e�ists fzom the poztd ta the eouEh, towazd the cul-de-sac af <br /> 'r"' Farm Road. If the Long Lake Road overflow Is too higk�, t},e a�erflow to the south might be <br /> excavabed to produce another, (pwer ov�flow route. . <br /> I hoPe this inform�tion wlll help avoid ai,y flood datx�age in yoax neighborhood. T'leese <br /> • conta�t utQ wi{h �ny questiozis.. <br /> '- Sin�y ' <br /> � , • <br /> ' Nels P. NeIsoz�,, P.�.: � .' <br /> � ** TOTAL PAGE.02 »� <br /> .//� — - <br />