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APR 07 '97 14:02 FWTTKE ENGINEERING, INC. 61 30300 TO: Pod <br /> City and county. ThuS the present drainage Syste�a is <br /> insufficient by engineering standards, <br /> It should 4160 be holed, that with the erosion potential of the <br /> moil in this area, special care Should be taken to prevent <br /> erosion. At present, the ditch leading to the culvert is deep <br /> with eroded material depaaited in the last several montna, Abd <br /> the culvert is nearly blooked: The present potential for water <br /> denago to the Sawicki home is actua17:p much higher than stated in <br /> the calculations above, as these calculations were based upon a <br /> fully functioning culvert. Additionally,, as this loose eroded <br /> zaterial is carried downstream through the culvert and on, it <br /> will deposit in the yards of both homes. Consequently it is <br /> expected that you both will Suffer damages from deposition even <br /> Without a 4 inch rainfall. <br /> In spry, increased runoff fro* the homes on Tonkaview resulted <br /> in increased stage (water elevation) at the culvert under tete <br /> Sawicki driveway, to the point that it overflowed, ran down the <br /> driveways, and resulted in damages. With the modifications <br /> recently malas to the drainage system, the bassesen house is <br /> probably protected from CR 19 water, hQweyar the Sawicki home is <br /> in (jreater peril. without Modifications to the present system, <br /> the next 4$ inch rainfall muid result in more extensive damage <br /> to the Sawicki home than in 1995. <br /> If you have any questions, please give me a call. I will be <br /> eivailsab16 to evaluate any proposed correction of the problem by <br /> the city and/or county las your representative), and to <br /> participate in litigation, should that be necessary. If <br /> liticlation is necessary, we will prepare some fancy charts and <br /> drRvIngs to illustrate the "whys and whereforesh. <br /> I hereby certify that thib report was prepared by me or under my <br /> diva—c—t 6upervirion, and that I am a duly Registered Profeimional <br /> Engineer uftder the State of Minnesota statutes, Sections 326.02-- <br /> 336.16. <br /> Tedd W. Mattke, Ph.D. , p.E. <br /> xx PE #13612 <br />