Your map and info is correct. I've been involved in farming all my life ( 63 years old ) and still am albeit in an alternative way. I just had a discussion with my neighbor who is the same age and we both agree we have never seen it like this before. There was zero runoff this year due to a lack of snow. I don't ever remember that. We have had 2 significant rains this year . The city of Morden which gets it's water from Lake Minniwasta is runnining out of water and desperately trying to pipe in Red river water. Its a really ugly situation.
And yet , the draining of sloughs and wet lands, tile draining , the removal of trees and bush , the removal of old shelter belts, continues at a frantic pace. If farmers can't get a permit to do this they just ignore the rules and do it anyway. The only time there are issues are if it directly effects a neighbor and causes friction. The fines for doing this illegally are an absolute joke. Its hundreds of dollars where as the land cleared or drained can be worth 5 to 10,000 an acre. The permits to do it legally are often affected by who you know or who you are. The extent ? I could easily come up with 20 examples of drained wetlands or bushes removed in the last couple of years within a 15 minute drive from my place on the escarpment. There is very little movement to stop this. There's not alot of push from those of us living out here to stop it. And frankly those in the city have no clue that's it's happening right on their doorstep or that it's even going on at all. Once a bush or wetland is gone, there is no evidence it was there. As far as tile draining it's really hard to see unless you know what to look for.