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Actually, it fits right in with your denialist misconceptions and misrepresentation of the facts.
Wow!!! there is literally so much wrong with this statement that it would take me days to address it all. But I will start with the fact that you are claiming that over 95% of the precipitation that falls on Portland ends up in its rivers and streams. This is, in reality, a number you pulled directly out of your butt! And the most obvious proof of this is your estimation of how much water is absorbed into the ground(1.47" per year). This is sheer stupidity beyond belief! This amount of water absorbing into the ground and available for Portland's plant-life is significantly less than the rainfall that most deserts of the southwest receive in a year. If this is true than most of the trees and plant life in Portland would not be able to survive without significant amounts of irrigation. Which brings up the issue of irrigation, of which you keep ignoring despite the fact that I have pointed out your denial of irrigation numerous times. Fact of the matter is that if this was all the water that was absorbed by the ground in Portland then Cactus would have a hard time surviving there much less the trees and the other plant-life. Obviously, you are wrong!
For the hard of thinking;
The land where the plants are, is soil, not concrete. That still absorbs as much as normal.
The concrete areas where the plants are not has changed thus the climate locally has changed.
Urbanisation does increase the amount of rainwater running away into the drains and then the sea without having the chance to evaporate or transpire.
Whilst irriagtion may well have an effect it is not doing so in the wet areas where they obviously don't irrigate.
The draining of wetlands will have had a far greater effect on transpiration rates in most cases than the increase in irrigation. Obviously there will be local exceptions.