I think it is a reasonable idea. Especially for rivers like the upper sheep, which I have fished alot, and which could use a nutrient boost. But in the case of the Elbow river, here is where things get interesting. I have fished the Elbow river from the nutrient poor stretch near Elbow falls, to the weaselhead stretch, and many times in the nutrient rich stretch flowing below Glenmore dam. It is a relatively small, somewhat shallow stream throughout its length, by our standards. What I have found is that the majority of trout (90% or so) I catch are under 10 inches. This is true of all stretches of the river. One might reasonably assume that with all the insect hatches that occur on the river in Calgary, with all those extra nutrients, that the trout would on average be significantly larger. Not so. The Brown trout in this stretch are every bit the little fish I see as the Rainbows at Weaselhead, or the Brookies and Cutts up by canyon creek. Places with far less nutrient loads. It seems that the shallow, smallish Elbow River contains mostly 6 to 9 inch trout all along its length. Maybe, small river=small trout. I don't really know? Just athought.