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ARDEN HILLS CITY COUNCIL May 26, 2009 9 Councilmember Holden asked how many rain gardens are currently in Arden Hills and if they were all working as they were designed to. Civil Engineer Giga stated that there are currently around twenty rain gardens. The rain gardens seem to be doing well. Staff is currently going back through all the areas to make sure that this is the case. The residents who currently have rain gardens were told that there is a one year warranty on the vegetation in the garden. Staff will be doing any replacements that need to be done this spring. Councilmember Holden stated that Ms. Nelson had mentioned a rain garden that was built on an incline and was not doing what it was designed to do. She asked if this particular rain garden had been inspected yet. Councilmember Grant stated that this rain garden may be the one located on the Ingerson hill. Civil Engineer Giga stated that she would have Staff check into this and report back to the Council. Councilmember Grant asked if the overflow from the rain gardens went into the storm sewer or if the overflow went from rain garden to rain garden. Civil Engineer Giga stated that the rain gardens are individual and there may be one that might flow into another but this is not typically the case. Councilmember Grant asked if there was below ground piping. Civil Engineer Giga stated that some of the rain gardens that are close to a catch basin may have a drain the connecting into the catch basin. Councilmember Grant asked if there were any bioswales in this development. Civil Engineer Giga stated that she would need to check the plans. Councilmember Grant clarified that a bioswale was the same as a drainage ditch. City Engineer Bloom stated that they were essentially the same thing except for the type of vegetation involved. Councilmember Grant clarified that Rice Creek Watershed did not require rain gardens themselves.