1996 Local Street Tree Plan - Laserfiche WebLink

New Search

The Eugene Local Street Plan proposes a number of amendments to existing codes and regulations that are consistent with stormwater management objectives. Several of the proposed amendments will provide design flexibility for a variety of stormwater design approaches. For example, this plan recommends that all new local streets be constructed with setback sidewalks. This approach will enable runoff from sidewalk areas to drain into planting strips and percolate into the soil rather than draining into the street. This plan also recommends a new standard for inverted curbs (see discussion under Curb Requirements, below) that will permit street runoff to drain into adjacent planting strips or grassed swales if that technique is used in the future. Proposals in the Local Street Plan to reduce street pavement widths will reduce runoff volumes and will ultimately reduce projected stormwater treatment costs. The Public Works Department Advisory Committee (Stormwater Management Program) is discussing the feasibility of a "grassed swale" design treatment. The swale is, essentially, a shallow ditch designed to accept and convey stormwater runoff. Grassed swale treatments require significantly wider right -of -way widths than are recommended in this plan. If grassed Swale standards are approved in the future, right -of -way width recommendations included here will need to be amended. Curb Requirements The City currently requires a standard (vertical) 6" high curb on all improved streets. The standard curb serves a number of purposes. Curbs: * act as a safety barrier, both for pedestrians on curb -side sidewalks, and for drivers during icy weather conditions; * channel stormwater into the storm drainage system; * facilitate street sweeping; * prevent automobiles from parking in planting strips or on sidewalks; and * keep the edges of the asphalt paving from breaking down. Not all of these functions are needed for all streets. This plan recommends two other option: inverted curbs and modified rolled curbs.. Inverted Curbs For Access Lanes (See proposed Street Classifications) which utilize adjoining grassed swales for the stormwater conveyance system, no curb will be required. Sidewalks will be set back from the street, providing the pedestrian some separation from moving traffic, and sweeping will be minimal as the stormwater runoff will carry the pollutant load into the grassed swal. A concrete retaining strip - essentially the gutter part of a curb and gutter section - will be constructed, in these situations, to prevent the asphalt street edge from breaking down. 3z-