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Memorandum to Don Mehsikomer, City Clerk -- Lake Elmo page 2 April 2, 1976 Chris Perez, a Lake Jane resident, asked the engineer if .he had an opinion as to the poten- tial damage on Lakes Jane and Sunfish, which have no outlets, if we have normal precipi- tation. Mr. Noyes, referring to the Valley Branch Watershed District study, said that if Lake Jane rises to 925. 5, there would be flood damage to five homes, eleven septic sys- tems, and 5, 400 trees. He stated that Lakes Olson and Demontreville, which have an out- let fixed at 929. 9, would probably have no additional damage to the trees -- the damage was done with last year's flooding. Gunnar Gitlow reported that a current check of lake elevations showed Long Lake to be 8 inches above the top of the culvert, indicating that there are two feet of water on Long Lake which will flow into Jane. He stated that Silver Lake has approximately one foot of water which will outflow, and that the culvert in Mud Lake is running 6 inches above the bottom. Engineer Tom Noyes, responding to additional questions, stated that if the Lake Jane elevation gets to 92 5. 5, with average precipitation according to the VBWD study, there will be five homes imperiled on Lake Jane, eleven septic systems inoperable, and 5, 400 trees flooded. One resident pointed out, however, that with Lake Jane at its present level, at least one-third of those 5,400 trees are probably flooded now. There is one home flooded on Lake Jane at its present elevation. Mr. Noyes reported with respect to the drainage from the ponds that last year we knew that 550 acre feet of water were due to run into these lakes from higher levels in the watershed, and an estimate at that time showed 90 acre feet of storage on the ponds before overflow. If we had elected to flood Deer Pond, the road and the surrounding area (including the .houses involved), it would .have reduced the number of acre feet of water by less than 20% to 460 acre feet, and wouldn't really have made much difference. Attorney Raleigh inquired whether the ditch on the temporary easement increases the amount of water which gets into Jane. Engineer Noyes responded that we know there is seepage from Lake Olson to Deer Pond and that beyond the 90 acre feet of storage which the ponds would .hold if the ditch were not there, the presence of the ditch does not increase the amount of water which goes to Jane but merely hastens its trip. Scotty Lyall inquired whether with Demontreville higher than the ponds, there is always seepage. The engineer responded that there was. Responding to a question of the Council, Engineer Tom Noyes stated that to alleviate the damage on Lake Jane, pumping will be required. When to pump is a good question. One home is now imperiled. Dr. Franta, President of the Valley Branch Watershed District, asked whether any benefit would be derived from delaying pumping, since all of the lakes appear to be filled to capacity. Engineer Tom Noyes responded that the amount of precipitation we receive and the passage of time may help or hurt the situation. David Morgan, Chairman of the Park Advisory Board, asked whether information was available as to the amount of damage done in the city park last year, and how much addi- tional damage would result from further pumping. Engineer Noyes stated that the damage to be done probably had been done and that not much more damage would be likely to occur.