Last day at Duke

On August 31, 2014, in Uncategorized, by Charles Podolak

As of August 31st, I am no longer at Duke University. I am starting a position as a AGU/AAAS Congressional Science Fellow on September 2nd.

I hope to continue to work on the issues discussed on this blog over the next year on Capitol Hill.




Today we published a new journal article in the Journal of the American Water Resources Association.  We look at an element of western prior appropriation water law that appears to challenge several of the basic tenants of prior appropriation water rights.

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In western water law, water is allocated by priority date. That is, when there is not enough to go around, the most senior (oldest) water rights get fully filled at the expense of the most junior (newest). But water rights are only valid to the extent that they are used – “use it or loose it.”

Priority date determines your place in line and you can only maintain that place in line by using water.

In all the prior appropriation states there is a provision to hold you place in line without using water while you build your project – a temporary “construction permit.” We looked at the number, uses, and age of these “construction permits” in Colorado to see how “temporary” they are. It turns out that there are a lot of rights that are holding their place in line, but are not being used.  We think this is the first quantification of an effect that has been discussed in the academic legal literature, but has not been measured.


Shipping our water to China?

On May 5, 2014, in Colorado River, by Charles Podolak


With the drought in full swing out in the western US, you cannot help hearing about the water stress felt by Colorado River users like Las Vegas, Los Angeles, and Phoenix. Many people will point to irrigated agriculture in the West as an inefficient use of water that ought to be stamped out. I disagree. Growing alfalfa in Arizona is not inherently a dumb idea – there is a long growing season, fertile soil, and a predictable climate. You just need to add water and you get fields that are as productive, if not more, than fields in the southeastern US.

The current issue of the High Country News has a nice little blurb about the fate of some of the irrigated crops from the Colorado River Basin. It turns out that we use some very valuable Colorado River water to grow alfalfa that we ship to Asian dairies.

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Vox Report Cover

Yet another report on water use in the corporate sector came out this week. This one is a joint effort by Vox Global and The Pacific Institute. They report on survey results covering 51 US-based companies from a range of industries. The companies were asked about how they view water’s impact on their businesses and how the business planned to respond to water challenges.

The top-line takeaway was that water was viewed as a current problem that affects many businesses – 79% of companies currently face water challenges, and 84% believe they will in the next 5 years. However they also found that “the majority of companies surveyed do not appear to be planning corollary increases in the breadth and scale of their water risk management practices”

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Every few years Congress authorizes numerous US Army Corps of Engineers projects under a omnibus authorization bill – typically called the “Water Resources Development Act” (WRDA). Congress has been working on the current iteration of WRDA throughout the year, and it appears the end may be in sight. I provide a brief summary of the status of the bill and highlight a few issues that I find interesting: authorizing projects in a post-earmark world, marketing of surplus water at USACE facilities (North Dakota), reservoir reallocation for M&I use (ACF controversy), and new vehicles for funding water infrastructure.

My summary is here: WRDA Status (Nov 21)

Briefly, as of Nov 21st, the bill is in conference, and the conferees have expressed optimism of producing and voting on a report by the end of 2013. The authorization process in the Senate bill is a bit more open ended and will lead to a more projects being authorized than the House bill which enumerates specific projects. Restrictions on reservoir reallocation included in earlier drafts of the bill seem to have disappeared.

Another excellent summary covering a wider range of WRDA issues by CRS is here.

I have found Bloomberg BNA Water Law & Policy Monitor (subscription required) to be the best source of current news on bill as it works it way through the process.


Free beer – A metaphor for western water rights?

On November 19, 2013, in Uncategorized, by Charles Podolak

Beer LineI find it easier to explain concepts if you can use a memorable metaphor that gets to the essence of what it is you are tying to explain. I was searching for such an metaphor to explain western water rights for a talk I gave at the 2013 American Water Resources Association Annual Conference.  I chose beer.

The essence of prior appropriation water rights is an ordering of claims to water based on the date the claims were established. This creates a “line” of water users. I compare this to people lining up at a party for free beer out of keg. The amount of beer in the keg is not known – it might be brand new and completely full, or it could be nearly empty. Each person in line may fill their cup completely before passing the tap to the next person behind them.

Even if the keg is nearly empty, the first person in line most likely gets a full cup of beer. Farther back in line, it is less certain whether you will get any beer. However, everyone knows where they stand in line, and it is apparent who has a higher chance of getting their glass filled and who has a lesser chance.

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Macknick et al (2012) Fig 1


The “energy-water nexus” has become popular in water resources over the past few years. I am skeptical of those that find a nexus in just about anything, nevertheless, there is a potential for some interesting and valuable research involving water use in the energy production sector.

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My dissertation work at Johns Hopkins involved trying to figure out what happens

Flume Elevation Time Series

to a river bed when you increase the sediment  supply to the bed. We know that the arrangement of a bed – bars, pools, riffles, etc… depends on the balance between the water and the sediment supplied to a reach of river. Dams can interrupt the flow of sediment and water, which can upset the balance and therefore change the character of the river. We were motivated to look at this by a dam removal ( during which the Sandy River, Oregon, was given an increased sediment supply. To expand on our observations in the field, we did a laboratory flume experiment at the University of Minnesota’s Saint Anthony Falls Laboratory.

This paper (Podolak and Wilcock (2013) ESPL published in Earth Surface Processes and Landforms) describes our experiments and their results. We used a large flume (nearly 3 meters wide) and established alternate bar topography. We then increased the sediment supply twice, measuring the bed topography and grain size as it evolved to the new higher sediment supply.

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Holding a place in line – conditional water rights

On July 24, 2013, in Water Law, by Charles Podolak

Would you save a stranger’s place in line for five minutes? What about an overnight line for the latest phone? These are essentially the questions that Coloradans face today over water. Many people are ‘holding a place in line’ because of a distorted application of a particular water law. Fortunately, the Colorado Supreme Court has stepped in to rein in this distortion, most recently in a decision handed down last week.

The distortion arises because of two key aspects of western water law. First, the doctrine of prior appropriation (‘first in time, first in right’) creates the line for water.  Users with the oldest water rights get their allocation first, and the more junior users get fulfilled only after senior water rights are filled. Second, because a water right is only valid if it is put to beneficial use (‘use it or lose it’) only actual users can ‘stand in line.’  This is intended to avoid water speculation.

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Is corn a dryland crop? Does anyone care?

On July 24, 2013, in Uncategorized, by Charles Podolak

I live in Washington DC and commute with public transit. Its always interesting to see what advertising / lobbying campaigns are placed in various metro stations, especially near the Pentagon and Capitol Hill. I’ve seen ads for warplanes, naval ships, budget cuts, and freight trains. There is currently a corn campaign on (farm bill season, don’t ya know).


One sign by the Corn Farmers Coalition, in particular caught my eye today – claiming that “89% of American’s corn crop is grown by relying only on natural rainfall. Source:USDA.” That raised two questions for me, 1) could that be right? it seems pretty low, and 2) does that message resonate? do people in Washington DC actually care about the amount of irrigation water applied to a particular crop?
I’ve been using irrigated agriculture data for a while so I checked the most recent USDA Farm and Ranch Irrigation Survey. In Table 27, they list crop production by state, and by crop type for irrigated and non-irrigated lands. They classify corn into three types – for grain and seed (89% of the planted acreage), for silage and greenchop (10%), and sweet corn (2%).When you apply irrigated and non-irrigated crop yields (from the same USDA survey) it becomes apparent that 77% of all corn comes from irrigated land and 21% from non-irrigated land. This is even more apparent in the three largest corn producing states: Nebraska (33% of all corn acres), Kansas (10%), and Texas (6%), where between 83% and 100% of the corn crop comes from irrigated lands. To be fair, I went to their website and downloaded their corn fact book. In there they claim that “89% of the crop is only watered by Mother Nature. The rest also received rainfall, but is supplemented with some water via irrigation.” I take this to mean they are claiming that 89% of corn is grown without any irrigation – which is just not true. I understand that a lobbying / marketing campaign is going to spin the numbers, but these look to be spun way beyond reality.
Leaving the accuracy of the claim aside, I wonder if anyone cares. One of the best messages I have seen recently in the metro advertisements is the claim that private freight railways have invested hundreds of billions of dollars into rail infrastructure “so you don’t have to.” In the current debate over fiscal prudence and infrastructure investment, I can see how this would resonate. But does anyone care how much water it takes to grow corn? We’ve seen how indifferent people are to the amounts of water applied to their own lawns. I think it is a stretch to think anyone’s views on corn are swayed by the amount of water applied to cornfields.
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