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Page 2 of 2 <br /> <br />Based on the observations of the system operations the engineer has recommended two changes <br />to the storm drainage system. The first is to add additional inlet capacity at the low point in the <br />road just west of the driveway to 1776 Venus Avenue. This additional catch basin would allow <br />for storm water to get into the system faster as well as provide some redundancy should one inlet <br />get clogged with debris. The result of this would decrease the ponding in the street and backup <br />into the driveway at 1776. As with any storm design there is always a larger storm event that <br />may come along and overwhelm the system. In these cases, it is important to have a route for <br />storm water to escape the low point in the road overland that does not involve flooding <br />structures. This low point in the street has a potential overflow route that can be created with a <br />minimal amount of grading. The second recommendation is to grade an overflow swale along <br />the east property line of 1776 Venus Avenue that will provide and overland route for storm water <br />to flow should a rain event exceed the capacity of the system. The other benefit of having an <br />emergency overflow route in place is that if the house at 1776 Venus Avenue experiences water <br />in the basement and the street water is show not to contribute to the problem, then the wet <br />basement is a result of roof runoff or yard drainage or some other factor unrelated to the street. <br />City Staff support pursuing both of the options recommended by the engineer. <br /> <br />Staff has met with both the owners at 1776 and 1768 Venus Avenue who share the common lot <br />line where this overflow route is proposed. We have described the proposed grading and have <br />obtained their approval of this approach. This work is proposed to take place within the existing <br />drainage easement. <br /> <br />Quotes were solicited for this work and the low price for the catch basin is from C.W. Houle Inc. <br />The city has contracted with C.W. Houle in the past and found their work to be acceptable. The <br />Low price on the swale grading was provided by Quinzon Outdoor who have provided services <br />for the city in the past as well. <br /> <br />Attachments <br /> <br />Attachment A: Elfering Memo 08/22/16 <br />Attachment B: photos of clogged screen <br />Attachment C: Catch basin 57A exhibit <br />Attachment D: 1776 Venus Avenue swale exhibit <br />