Re: drainage problem/1999 - Laserfiche WebLink

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O DKAF O, O == R CITY of ORONO Municipal Offices Street Address: Mailing Address: ' Hp4 2750 Kelley Parkway P.O. Box 66 Orono, MN 55356 Crystal Bay, MN 55323-0066 July 28, 1999 Mr. Tim Landon 1375 Vine Place Mound,Minnesota 55364 Dear Mr. Landon: We have reviewed the drainage situation on your property and have retained Bonestroo Engineers to complete a topographic survey of this area. A review of this survey shows that the low point on Vine Place is located adjacent to the southern loop of your driveway. I have also attached a copy of the City's 2 foot contour aerial photography mapping. A review of this mapping shows that your house is located near the bottom of a large hill. With the hill area to the north,the historical drainage has always been across the property toward Forest Lake Channel. The channel's normal water elevation is 929.40. The lowest elevation shown on the topographic survey is 930.76. The elevation of the southwest corner of the walkout basement is 932.13 which is only 2.73 feet above the channel's normal water elevation. Based on a review of the attached mapping,it is not surprising or unusual that water drains across your property and that the yard and basement may be wet at times. A detailed review of the topographic survey information shows a low point of 933.24 on Vine Place. The water from this low point then drains to the southwest toward a 932.00 elevation in the yard. Between the 932.00 elevation in the yard and the 932.13 elevation at the southwest corner of the house is a higher elevation of 932.60. This higher elevation of 932.60 will effectively prevent the water from the low point elevation from draining toward the house. A review of the topographic survey also shows that the driveway and yard east of the house is higher than Vine Place. The water from the driveway drains east toward the low point area on Vine Place. Based on the previously discussed high point of 932.60 in the yard and the higher elevations of the driveway, it appears that Vine Place drains to the low point area at the south driveway entrance to the southwest toward the channel. This is the historic and natural drainage pattern. It does not appear that the street drainage is the cause of your wet basement. Telephone(612)2494600 • Fax(612)2494616