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<br />e B. Creation of a Master Plan <br /> Mr. Lyle said it is necessary to develop a master plan to plan for future <br /> expenditures and to help in policy implementation. He said a master plan is <br /> also helpful to the City in working with developers. Mr. Lyle said there are <br /> four basic ways in which to control storm water: natural drainage, a pipe <br /> system, detention systems, and no system. <br /> Mr. Lyle showed several slides depicting the types of improvements identified <br /> in the master plan. He said staff will probably explore the concept of <br /> detention basins and natural drainage in the Willow Creek area. Detention <br /> basins are appropriate for the Willow Creek area because it is undeveloped <br /> and because they allow for a reduction in network size both in terms of <br /> diameter and systems costs. <br /> In the River Road/Santa Clara area, staff is trying to preserve the open <br /> channels where possible, and will attempt to preserve existing dry wells. In <br /> the Willakenzie area, staff is also looking at using channels. Glenwood will <br /> require construction of major pipe systems. In the Greenhill area, <br /> additional pipe systems will be needed and some open channels may also be <br /> constructed. <br /> C. Issues <br /> Mr. Lyle said there are currently several gaps in the storm sewer system in <br />e developing areas. Typically the department waits to correct gaps in the <br /> system until development occurs or the street is improved. He said the City <br /> needs to be concerned about liability issues in areas where there are gaps in <br /> the system. Mr. Lyle said if the City allows the capacity of the existing <br /> natural drainage way to be exceeded, it may be liable for any property damage <br /> that occurs. In response to a question from Mr. Rutan, Mr. Hammitt said some <br /> claims have been filed against the City around this issue but he did not <br /> think the City has had to pay any claims. Public Works Director Christine <br /> Anderson said in order to receive an award, a property owner must provide <br /> documentation of damage to their property; this is hard to demonstrate and <br /> probably contributes to the fact that the City has not routinely had to pay <br /> claims. <br /> Mr. Lyle showed slides of natural drainage ways which the City has not <br /> maintained. He said staff would like to clean many of the channels but is <br /> unable to do so because there are no access easements. The City is liable <br /> for damage caused under these conditions (even where access is not possible) <br /> because it contributes to and allows storm water to go through those natural <br /> drainage ways. Mr. Lyle said even though there are maintenance problems, the <br /> City will increasingly try to use open channels because of the reduced costs. <br /> Mr. Gleason said a classic problem with natural drainage ways occurred last <br /> summer when the City was constructing a sanitary sewer in the River <br /> Road/Santa Clara area. The City had to remove water from the sewer trench <br /> when excavating for the sanitary sewer system. This water was discharged <br />e MINUTES--Eugene City Council November 7, 1988 Page 2 <br />