I spend some good amount of time on evolving the idea of property rights on water resources, especially rivers. I checked the community threads about it, but most people (even here) have fallen back on the idea having rivers treated as public property, since craving property rights on river sounds too complicated.
Q: How do you define the property rights on the river?
Ans: The definition of property rights on the river would be through homestreading principle.
Anyone making first use of the water has a right to own it. In the current setup, the most practical way of doing that is to have various river banks treated as the property(technically even today they are property because they are on land) of their homesteaders. With evolution in technology anyone making use of surface of the river will get property rights on it.
Q: How much water can an owner extract, what rights does he have?
Ans: The property owner can extract as much water as he wants, and can. In market that water will be sold to the people whose property does not have direct access to the river. This is not an extra charge for nothing, the river owner is asking money for supplying water through his proerty which is a usage of his property.
Q: Does this mean that those who live far away from the river will have a disadvantage?
Ans: No! The land prices of a property far from river will be less than a property right next to river, because it costs more to get water to a farther area than to a property close to the river. Also the price you pay for receiving water that far would be quite just considering the costs involved. You will be paying the land owners from whose property the water line goes through.
This is similar to the ongoing Iran-Pakistan-India gas pipeline project. India is going to paying heavy amount of money every year to Pakistan so that latter ensures that the pipeline remains secure and is not disturbed. This is a service Pak govt will provide to Indian govt.
Q: What are the rights of downstream owners? Wouldn't upstream owners take all the water from the river, leaving nothing for the downstream owners? Nobody would want to be in downstream.
Ans: Well its true that the upstream owner can extract all the water from the river, or even stop the flow of the water(provided he can do that without causing flood), and it will not be a violation of private property rights, of the downstream owner, it would not be a bad situation. The downstream owner will have to buy the water from upstream owner. The rate would be the same market rate at which the upstream owner supplies the water to upstream basin people(lets call it the upstream water market). The downstream owner will be able to afford this rate because he also has a market of water buyers who need to use it(lets call it the downstream water market).
Q: This raises an interesting question, wouldn't upstream people be using the water too much since they just have the water very easily available to them? They will be filling up their swimming pools and water parks, when the downstream people will be going thirsty.
Ans: The answer lies in marginal utility of river water. When the urgent needs of upstream people are fulfilled the marginal utility of water to them is now reduced, at the same time, since the downstream people have no water, so the marginal utility of water has increased for them. Consider it this way, if a guy needs water to fill up his pool, and another guy needs water to drink, which one of them would be willing to pay a higher price for the water? The answer is, the thirsty guy.
So for the upstream river owner, the only next best price he can get from buyers would be from downstream owner. So once water is supplied to the urgent needs of upstream people, the water will be now supplied to downstream people. The upstream guy will now sell the water to the downstream people. Once the urgent need of downstream people is fulfilled, now whomsoever needs to really fill up his pool will get the water(because his marginal utility is now on priority).
Q: Does that mean that living in downstream is costly than living upstream, compared to the time when the river was a public property?
Ans: Only marginally. See you are not paying an exhorbant amount of price for the water. You are merely buying clean water from the upstream river owner. Today if you live downstream, the river is really filthy, you cannot get clean water. So to get clean water, you are paying a small amount of fee to the upstream owners.
This fee is basically paid so that they don't pollute the water. Also if upstream guy pollutes the water, the downstream owner gets to drag him to court for damages.
Q: Are there any other advantage of having private property rights on river?
Ans: Lots of them. First of all, the marginal utility of water will directly decide how much water is supplied to whom. For example in a delta of two rivers, there is a plenty amount of water. So the the marginal utility of water for the people living here would be less than to upstream owners. This means the upstream owners can extract more water and supply it to more needy people.
The downstream people will get clean water which currently is not possible. There will be no pollution, there is no way factories will be able to dump their waste in the river because it won't be worth the cost.
Feel free to agree/disagree on these issues, I would love to get some output from people here. Also if there are any new question, I would add them, and make it a bit more comprehensive FAQ. I have realized that FAQs are the best way to explain Libertarian concepts to people, because generally Libertarianism deals with encountering govt indoctrination in the minds of people, so questions-and-answer format is the best way to explain it to people.