Agenda - Council - 07/14/2009 - Laserfiche WebLink

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CASE # ~ CONSIDER DRAINAGE RESOLUTIONS FOR GORHAMS SANDY ACRES By: Tim Himmer, City Engineer Bnckground: A resident at 15130 Waco Street NW contacted the engine~ring department last summer requesting assistance with localized nooding on his property; at times affecting his existing garage. Staff visited the site and reviewed the area topogntphy to determine the extent of the problem. The property owner . lives at the low point on the road and this street is constructed with ditch sections on both sides, so all runoff from the contributing area drains to the ditch sections and nows to the low point. No culverts exist tinder driveways so each property along the roadway basically has some standing water during rain events uhtil such time that it gets deep enough in the ditches to overtop the driveways, or infiltrate into the ground. The property owner's garage was constructed in a location that altered the existing drainage patterns of the area and dl.lmns the Wi;lter at a low point located in his back yard. Runoff is not able to tind an overland path and now through to Xkimo Street. Even if water were able to now to Xkimo Street, as previously existed, there is a low point in the ro.ld surtllce along that road\'vay that would push the runoff problem onto another resident. Therefore, staff considered this as a potentiallal'ger regional project as opposed.to a single drainage complLlint. We sttU'ted evaltHJ.ting a m()N all encompLlssing approach to handling this isstte, Observations: This area of the City was constructed in the late 1970's, and thet'o is vorl' little stQrm sewer that exists in the area. The rural ditch sections do not appe.w to be well maintained and most driveways lack cLtlverts that allow a continuous drainage path for runoff. A neighborhood open house was held at City Hall on April 29, 2009. Invites were sent to forty (40) property owners in the area located between Yakima and Waco Streets. Two individuals responded to the mailing; the resident that called in the initial concern and one other resident who claimed this item is being blown out of proportion. A few options have. been discussed for either a site specific tix, or a more regional solution. The property owner talked through all the improvements that he has undertaken to correct this standing water concern on his 'Own (gutters and downspouts on his home, draintilc, trench drains, and grading), ,md he is now requesting assistance from the City to help resolve this issue. Staff has offered to provide- information and calculations on the drainage ~ea and approximate size of a rain garden/intlltration basin that could be privately constnlcted along the common lot line with U'1e neighbor to his south, who is open to assisting in a workable solution, Funding: This project could be eligible to utilize Storm water Utility funds. Optio-ns: 1. Approach this as a regional problem and address runof!' on a larger scale with storm sewer, easements, re-ditching, culvert installation, etc. Additional work would be required to accomplish this, and more residents would need to be included in the discussion related to a sol~tion. Another item to consider under this scenario is whether to address this as a standalone project now, or wait tor a reconstruction/maintenance project scheduled for the future. 3