10-15-08-WS - Laserfiche WebLink

Home Browse Search

ARDEN HILLS CITY COUNCIL WORK SESSION - OCTOBER 15, 2008 7 continues to be developed a storm water plan needs to be implemented with ponds or storm sewer systems. Mr. Samuel indicated the vegetation around storm water ponds would need to be determined, along with if they should be manicured and how these will be maintained. He stated the ponds could be used recreationally, have fountains, etc. Mr. Samuel noted the City would be held to two requirements, water quality and water quantity. The rate at which the water is removed from the site is a concern along with how clean the water is. Mr. Samuel reviewed several types of ponds with the Council stressing the importance of the water level and quality. He noted vegetation was important surrounding these ponds. Discussion ensured regarding the predicted pond elevations and recreational uses of the ponds. Councilmember Holden questioned how the ponds were to be maintained. Mr. Samuel indicated the general rule of thumb was that the pond be dredged every 15-20 years. He stated the criteria for the TCAAP site would be to design a 10-acre drainage area. Mr. Samuel explained the Council would need to determine the type of storm system that will be implemented. Mayor Harpstead questioned how much expansion of water surface area was needed with a typical rainfall of one inch. Mr. Samuel felt that a 10-20% increase in surface area was a fair estimate. He stated with the vegetative shelf this may not be noticeable. Large rain events will create a larger fluctuation in the pond surface area. Councilmember Holden asked how many ponds were being proposed. Mr. Samuel stated this would be dependent on if the Council was in favor of large or small ponds for the site. Mayor Harpstead stated he would not be in favor of the water flooding the grassy areas with average rainfalls. He would like to see the ponds stay within their