Laserfiche WebLink
City of Mounds View <br />June 1, 1989 <br />Page #2 <br />Review of Alternatives <br />The flood level generated by the 48" pipe during the 5 year <br />storm is only about 3 feet below the low point of Silver <br />Lake Road. In fact, it is 'likely higher than the hasement <br />elevation of the home on the lot next to the inlet ditch. <br />In addition, the 100 year storm needs to over flow the berm <br />at an elevation higher than the yard next door, so grading <br />needs to be carefully done so that the overflow occurs north <br />of the creek. <br />The box culvert, on the other hand, results in a very low <br />flood level height relative to both Silver Lake Road and the <br />adjoining home. It will also be much more aesthetically <br />pleasing as the trail will not have to rise to such a ,great <br />height above the pond as it would have to if it went across <br />the culvert. The .structure itself also has more of an <br />appearance of a bridge. <br />At a cost of $13,000 for the box culvert, one has to check <br />on the likely cost of a pedestrian bridge in this situation. <br />Several manufacturers make an expensive bridge with railings <br />capable of handling a light pickup. For this situation, our <br />structural engineering department estimated that a 10' wide <br />structure adequately spanning the creek would cost $20,000 <br />to S25,000. <br />We would recommend that you proceed with installation of the box <br />culvert at an estimated cost of $13,000. As we discussed, when <br />an alternative is decided upon, a Watershed District permit will <br />be necessary. <br />We can assist you further if you desire. <br />Sincerely, <br />Daniel R. eoA-ud <br />nRB/nih <br />cc: Ric Minetor <br />Rocky Keehn <br />0 <br />