Little Canada City Council — Transcript
Tuesday, May 28, 2019
Twin Lake High Water Levels: Causes and Impacts
Historical Drainage Alterations and Outlet Issues
Urgent Call for Solutions and Next Steps
Notable Quotes (9)
this is a I guess a third step in our process of evaluating this very serious issue for the city... following up on issues for quite some time I think over seven or eight months now plus ongoing issues for several years on the the levels of the water levels on Twin Lake.
the general conclusion that we could we could make here is that the the the precipitation record seems to be the primary cause here for the change in lake levels it doesn't it's not necessarily explained by other changes within the watershed.
we don't know what the future holds for water levels we don't know if we'll continue in this or we'll get some lower levels but we want to look at building resiliency into our systems and that's our goal.
I mean there are homes that whose footings are in the water right now that has never happened in 34 years and it's not all rain certainly rain has had an effect but the lake used to have a natural outlet and when they did the unweave the weave project they altered the land where the water used to flow and now our lake is backed up.
my question is when unweave the weave or when the highway first went in how did they shut that ditch off because that overflow should be out of 72 I mean not a 77... who made the decision to make that over for the 77 which is a taking of this land it's all under water now.
The predicted hundred year flood level for Twin Lake is eight hundred and seventy three point eight the reading as of yesterday was eight hundred and seventy four point nine seven. We have surpassed our hundred year flood level... we need some action here.
I 694 construction had impeded the previous level of the old ditch outlet there also used to be a ditch outlet from West Venus that went down to the south as well and that was cut off by 694 completely... we realized that we really need to go back and take a look at what used to be an emergency outlet level and when that something needs to be established.
we've run out of time this is an emergency and it's emergency now we need to do something about it now we need help from the city we need help from the watershed district consistant help.
to hear that there's water gushing in even when it's not pouring rain it's very disheartening and to know that even without rain it's it's going to continue to disappear in the watershed that's that's draining into into that whole drainage area is is is is really sad to see and I think that we all were we're all here intelligent hard-working well-meaning people that we can we can do something about the sooner or later because I think we just have a few weeks left is is all.
Ordinances & Resolutions (9)
Established in 1975, covers 12 cities and 65 square miles, manages various lake systems.
Plans reviewed that showed the overflow to the MnDOT pond at 877 feet.
A past study that showed Twin Lake's overflow at 876.9 feet.
Provided by a resident, showed Twin Lake's overflow at 874-875 feet, and indicated a ditch connection to 694.
Source for historic monthly and annual precipitation data.
Reviewed for regional groundwater flow information, showing flows from Northeast to Southwest.
Estimates seepage rates for Twin Lake.
Document cited by a resident, discussing Twin Lake remaining landlocked and mentioning potential culvert installations for discharge if Vadnais Lake regular discharge is expected.
A historical ditch identified by a resident as part of Twin Lake's original overflow system, believed to have been shut off by highway construction.