Not to burst everyones bubble, but I dont see how elm creek could be turned into an open water way without significant excavation. It would be extremely expensive and impractical considering that most of it is 60 + feet underground. Also, I dont see how a considerable water level could be maintained in elm creek if it were an open water way due to the elevation change from central park to the river. Central park is a basin that over flows into elm creek, and elm creek only has a large amount of water in it when it is raining or has just rained. At any given time, there is only about a foot of water in elm creek. It is a good idea none the less. At the exit point at the river it is about 16' in diameter and continues that size for about a mile. It also has a large 30 inch forced main sewer line running down through it, which would also pose a problem for maintanence issues, if opening it up as a water way. Having said that, a small portion of it (around highway 75) that is not quite as deep would be able to be opened up. I have been down it many times and made a map that is fairly accurate. Anyways, thats my two cents...
Nice map, thanks for sharing. I don't think maintaining levels would be that big a deal if you use a series of gates. Not much different than the Oklahoma River just south of Bricktown.