Agenda - Council - 08/12/2008 - Laserfiche WebLink

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CASE # CONSIDER 2008 STORM SEWER IMPROVEMENTS By: Steven Jankowski, City Engineer Background: Recall that at the June 19, 2008 Public Works Committee meeting staff presented several-storm water issues that are brought to its attention through citizen complaints. Below is a brief description of drainage issues being evaluated for possible correction in 2008. • 16350 Kangaroo Street - A majority of the right-of--way drains to one location within the cul-de-sac and flows through an easement along the property line to a larger drainage and utility easement encumbering a wetland system behind the residences. This concentrated flow is creating an erosion problem along the property line and within the naturally occurring ditch system in the wooded area behind. Stabilization is required along the eroded areas • 6941 152nd Avenue -Drainage-from Jaspar Street is transmitted from the street. via a bituminous spillway and is supposed to flow through an easement along the property line to a wetland. The grade is relatively steep and the flow is not staying within the easement and is causing erosion. A line of mature pine trees along the northerly property line of 6941 152nd Avenue prevents the likelihood of turf ever becoming established. The property owner reports that water sometimes flows into his nearby outbuilding. • Llama Street and 163rd Avenue - A short segment of storm sewer is in place west of this intersection. However flow to this system originates over 1500 feet to the south near the intersection of Llama and 163rd Avenue, a distance of over twice that recommended for curb line flow. A large portion of 163rd Avenue is inundated during storms. To make matters worse the flow washes large quantities of pine needles onto the existing catch basin which plugs the basin. Water then overflows the crown of the 163rd Avenue and flows down the driveway and into the property located at 8411 163rd Avenue. • Kamacite Street and 148`h Lane/Avenue -There is substantial ponding on the common lot line between 7062 148th Lane and 7061 148th Avenue. This storm water is generated from several contiguous private properties. Both property owners have expressed interest in resolving this issue. • 6043 Highway 10 -This building is the former Parabody building on Highway 10 which is located immediately west of the Anoka-Hennepin Technical College parking lot. This property has three catch basins located on its east side which have been designed to percolate storm-water into the sandy soil. These catch basins work poorly and water stands for days after heavy rain or snow melt events. Several years ago a storm sewer was constructed through the north side of the property which transmits storm water from the -1.70-