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groundwater

Aquifer Storage and Rrcovery SURvey

August 22, 2013
Aquifer storage and recovery, groundwater, management, planning, Risk Management, Uncategorized
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My apologies for being off line for a couple weeks.  We finished the summer semester the first week of August, and are now gearing up for the Fall semester.  Lots to do, and proposals and other projects to complete before the plunge.  The most interesting project this summer has been the conclusion of a national survey of aquifer storage and recovery (ASR) projects.  The concept of ASR wells is to store water underground until you need it later.  If you have a utility with limited water supplies, or if you have high demands a certain part of the year but not the rest, ASR has been touted as a solution.  Storage underground eliminates the evaporation losses, but the question has always been can you get the water back.  The survey, which will be fully published next year, shows 204 sites.  It shows only about a third are operational projects and over 50 that have been functionally abandoned.  The reasons for abandoning them include metals leaching(mostly a Florida problem), the inability to recovery the water (particularly a problem in brackish aquifers), lack of capacity and trihalomethanes (a regulatory issue in a couple states).  ASR was successful with limited injection rates (700 gpm) and where the aquifer was denuddded (South Carolina).  Growth seems to be in the west after a lot of effort in the southeast.  The road forward should prove interesting.  With completion of the study it is hoped that more data can be gleaned to indicate the factors that make ASR project successful, thereby increasing the rate of success for the future. 

REVISING OUR VIEW OF INFILTRATION GALLERIES IS SOUTH FLORIDA

July 13, 2013
Climate, Environment, groundwater, infiltration, infiltration gallery, infrastructure, innovation, Leadership, management, sea level rise, sustainability, Tidal flooding, water sewer management, water supplies
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A recent Rolling Stone article outlines a potentially dismal future for south Florida.  I was quoted in the article and give the author a bunch of information.  It is hard to write articles that “pop” in the popular press while conveying facts and figures.  But I would suggest that the future is not quite as dismal as the article depicts.  The sea level rise has been ongoing for at least 140 years as indicated by the Key West tidal station, the longest running tidal gauge in the world, but the amount has been 9 inches since 1920.  True it appears that the sea level rise may be accelerating as a result of warming temperatures in the atmosphere that causes the oceans to expend, plus the loss of ice that runs off from glaciers, but 3 feet by 2100 seems the average or maybe the high average.  That is unlikely to inundate all of south Florida, but keeping the water table low will be a challenge.  I suggest that the challenge can be met and accomplish two goals.  In low lying areas the impact of sea level rise is really manifested as increasing groundwater tables.  An increased groundwater table means less soil storage capacity, which means smaller rainstorms will cause flooding.  The increased flooding is already creating a demand by residents for solutions from local public officials.  We have used exfiltration trenches (French drains) for many years, but increasing water tables will mean many of these systems will not function as they may be currently.  But what if we reverse the concept?  Instead of exfiltration, what if we allowed the water to infiltrate the pipe and go to a central wet well, and then pump the water out of the wet well?  I further suggest that the dumping large quantities of groundwater to the ocean or canals may not be permittable as a result of high nutrients, so what if this water is instead pumped to a water plant as a raw water supply?  Wouldn’t that solve two problems at once? Lots of excess fresh water supplies in an era where there are significant limitations in fresh water supplies?  Just thinking….. 

 

 

Sustainability and Risk Managers as Future Water Manager Obligations?

June 27, 2013
Climate, communciations, Environment, finance, funding, groundwater, Holistic Water Planning, infrastructure, innovation, Leadership, management, Marketing water, planning, Risk, Risk Management, sustainability, water sewer management
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In the past week I have had the opportunity to experience the extremes with water – heavy rains/tropical weather in SE Florida, and dry weather in Denver at America Water Works Association’s Annual Conferences and Exposition. Two months ago with was snowing in Denver and there had been limited rain in SE Florida. Six months ago we were both dry and there was significant concern about drought in both places. How quickly fortunes change and the associated attitudes as well. It is part of a perception problem – looking at the near term – instant gratification, as opposed the long-term consequences. In truth neither set of conditions is historically different or should have created major panic or much shift in attitudes, but it is the potential to predict conditions that require the water manager’s scrutiny. We have all become risk managers.

Managing risk is not in the job description of most water and sewer personnel (risk managers aside, and they are focused on liability risks from incidents caused by or incurred by the utility like accidents, not water supply risks). We spend a lot of effort on the engineering, operation and business side, but less on planning or risk/vulnerability assessments. EPA has required vulnerability assessments in the past, but having seen some of those exercises, most are fairly superficial and many put on a shelf and forgotten. I have had clients ask me if I still had copies because they did not. Clearly we need a renewed commitment to vulnerability assessment.

Vulnerability starts with water supplies. Groundwater is particularly tricky. A new USGS study reports significant decreases in water levels in many aquifers across the US, especially confined aquifers in the west. That situation is not improving, and the situation will not correct itself. Loss of your water supply is a huge vulnerability for a community. Finding a new supply is not nearly as simple as it sounds or as many are led to believe. Confined aquifers do not recharge quickly and therefore have finite amounts of water in them. Remove too much water and all too often land subsidence occurs, which means the aquifer collapses and will never hold the same amount of water. USGS has mapped this and it matches up well with the drawn down aquifers. More data needs to be collected, but Congress is looking to cut USGS funds for such purposes, just when conditions suggest the data is needed most.

Many watershed basins and many aquifers are over allocated and overdrawn, and not just in the west. New England and the Carolinas have examples. Overallocation means competition for water will increase with time and it will be utilities that everyone will look at to solve the problem. Afterall the utilities have money as opposed to agriculture and other users, right? To protect themselves, water utility managers will need to look beyond their “slice of the pie” to start discussions on the holistic benefits to water users throughout the watershed, which will extend to understanding economic and social impacts of water use decisions. It is not just about us, and paradigm shift that is coming and one that we as an industry need to be the leading edge for. Our use impacts others and vice versa. Every basin wants to grow and prosper, but decisions today may reduce our future potential. Klamath River is a great example of misallocated water priorities. The biggest potential economy in the basin is Salmon ($5B/yr), followed by tourism ($750 M and growing), which relies on fishing and hiking. But agriculture ($0.2 B/yr) get the water first. Then power, which warms the water (salmon like cold water). Then a few people (a few 100,000 at the most in the basin). The result, the salmon industry gets reduced to $50 M/yr. Now how could we create more jobs, which would result in more income and a bigger economy? The easy answer is encourage the salmon industry, but that doesn’t sit well with the other, smaller users that will become more vulnerable to losses.

I suggest that to harden our water future in any given basin, we need to start looking a little more holistically at the future. This type of analysis is clearly not in the job description of the utility or its managers, utility managers may have the best access to technical expertise and information. As a result to protect their interests and manage risk, we may need to shift that paradigm and become holistic water managers.

Radio Program last week

June 5, 2013
Environment, funding, groundwater, infiltration gallery, infrastructure, innovation, Leadership, management, planning, sustainability, water sewer management, water supplies
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Radio Program last week

Hi all.  Here is another radio show I did last week talking about  my company Public Utility Management and Planning Services Inc. and water sustainability. Take a listen. Let me know what you think.  Thanks

Fred

Infiltration Trenches for Storm water and Water Supply? 2 for 1?

June 2, 2013
Climate, economy, Environment, groundwater, infiltration, infiltration gallery, infrastructure, innovation, management, riverbank filtrations, Tidal flooding, Uncategorized, water sewer management, water supplies
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The concept of horizontal wells arises from riverbank filtration concepts.  Riverbank filtration has been practiced for nearly 200 year in Europe, where the concept was to remove debris form polluted waters by drawing through the banks of rivers.  Much of the concepts for groundwater flow are related to the filtration ability of water to move through a porous media.  The concept was to dig trenches along the river and draw water from the trenches as opposed to the polluted rivers.  The concept worked relatively well.  The result is an abundant, dependable supply of high-quality water with a constant temperature, low turbidity, and low levels of undesirable constituents such as viruses and bacteria. Riverbank filtration also provides an additional barrier to reduce precursors that might form disinfection byproducts during treatment.

Now let’s look at this from another perspective, and we’ll pick on southeast Florida as is provides a great case study.  Sea level rise will inundate coastal property, both via coastal flooding and from a rise in groundwater. Since most stormwater drainage depends on gravity flow, drainage capacity will suffer as sea level rises reducing the head differential between interior surface waters and tide. Saltwater intrusion will be exacerbated. Furthermore, reduced soil storage capacity, groundwater flow and stormwater drainage capacity will contribute to increased flooding during heavy rain events in low-lying areas.  In low lying areas, current practices like exfiltration trenches will become impractical, as will dry retention will become wet retention.

Stormwater utilities will be faced with dramatic, currently unanticipated increases in capital expenditures and operating costs, and time will be needed for planning, design, securing permits and compliance. Additional local pumping stations on secondary canals will be needed to supplant the storm drainage system in order to prevent unacceptable ponding. Design capacities of these stations will depend on local rain patterns, drainage basin size and secondary canal system design.  Many will operate continuously, which means ongoing operations will increase substantially. Hundreds of pumping stations may be needed in some communities.

Permits will be a major challenge due to contaminants in the runoff as regulated by MS 4 Stormwater permits, and the inability to treat this water under the current structure. The cost and energy required for stormwater treatment would be a major concern going forward. But what if we sent this continuous flow to water plants as raw water?  All of a sudden we have a solution to two problems – stormwater and raw water supplies.  How often do you see a 2 for 1 solution?

Talk Radio discussion

May 18, 2013
Climate, communciations, economy, Environment, funding, groundwater, infiltration, infiltration gallery, infrastructure, innovation, Leadership, management, sea level rise, stormwater, sustainability, Tidal flooding, Uncategorized
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Talk Radio discussion

Hi All.

This is a radio show I did this week.  One of 4 I have scheduled.  It talks about me and my company, outlook, thoughts.  Take a listen.  Let me know what you think!

Fred

Planning for Change (like sea level rise)

May 1, 2013
Banking industry, Climate, Development loans, Environment, groundwater, infrastructure, Insurance, Leadership, planning, sanitary sewer, sea level rise, stormwater, sustainability, Uncategorized
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After my last post, I was asked about sea level rise and how to get started with the issue in a very “red” area as it was characterized.  I have come to the conclusion that the insurance industry will make sea level rise real for politicians in those places where it is impermissible for bureaucrats to discuss it.  Here’s why.  Say you have a house in a low lying area that is vulnerable to sea level rise and/or storm surge.  One is permanent, the other temporal, but in both cases are potentially catastrophic if you live in this house.  You bought the house, got a loan for 80 or 90% of its value and then got insurance for it.  Now the insurance is there to insure that if your house gets swept away or damaged, there will be enough money to pay off your loan.  That’ s what many people miss.  Insurance is for the bank, no you, which is why your loan documents require that you get and hold insurance while you have the house.  After your loan is paid off, there is no such requirement.

Now let’s say we are out 20 years.   You have enjoyed your house but have decided to sell it.  Now the banks will value it and are willing to loan say 80% of its value.  They of course assume that the house will increase in value with time so even if you make no improvements, if they have to foreclose on it they will get their money back (a major part of the problem with the financial crisis of 2008 was they banks could not get their money out of the properties).   Even if it doesn’t, as your loan is paid down, their risk decreases.   The loan documents require that you get insurance to cover your costs.

So far so good, but what happens when the insurers will not give you insurance for the full value of the property?  In Florida the State creates Citizen’s to deal with the fact that private, commercial insurers saw too much risk in coastal areas and refused to issue policies.  Now the State and Citizen’s have the risk.  Fine, but that isn’t dealing with the same issue – if the insurer think the value of the property will decrease, or the risk increases a lot, they will not issue policies. Or they will revise policies to say they will pay once – but will not insure you for rebuilding.  You may think this will not happen, but Citizen’s is already discussing this option.  Hence if you lose your house, they will pay you (so you can pay the bank, and then you are on your own.  Now the bank may be willing to offer you a distressed property as an options (Welcome to Detroit), but that won’t be in the same risk zone.

Take this further, let’s say Citizen’s for example says we will pay full value if you lose the house but will not insure a rebuild?  That means they probably will not give insurance to the guy who wants to buy our house in 20 years.  How much is your house worth now?  Probably nothing, which means now the bank will be looking at your insurance coverage and say – whoa – if the house is not worth anything on a resale, that means they may not get paid when you sell your house if you sell if before it is paid off (the norm)!!  That is an unacceptable risk, and they need a solution.  Of course if your house suddenly has no value, it means local governments get no revenue for taxes (good for you, but bad for providing essential services like storm water.  You may not believe this discussion is happening, but it is.

So here’s what I think happens.  I think the banks figure this out and start looking at vulnerability as a part of loans.  I think they start thinking about what the value in 20 or 30 years might be and if they can get their loan monies back out of property.  That will slow property values.  I think the insurance industry does the same, and working with banks will further set the prices acceptable for vulnerable property.  They are not good investments. If you own such property, you may get insurance in the short-term, but long-term your house value may decrease.  At some point, your house will have no resale value, unless……

BUT there iis a big caveat to all this.  Coastal areas are high value markets.  Lots of activity and lots of investment opportunities.  It all depends on what is being done to protect those properties, and depending on the federal governments to bail out private property is unrealistic.  It is a local issues, so I also think the banks and insurance industry will start looking at what local governments are doing to protect investments in private property.  Do they have a sea level rise adaptation plan?  Are the storm water systems updated/upgrades/maintained?  Are roads, water supplies and sewer systems capable of functioning under the changed condition?   Is there a 50 or 100 year vision on how the community adapt to nature?  If yes, there is comfort that investments are protected.  If everyone’s head is buried in denial…..Detroit’s calling.  U-haul anyone?

PS  No disrespect to Detroit, my father’s hometown and the home to many of my current and departed family.  For those who do not know, Detroit is high, has access to lots of water, sewer, roads, power and lots of land at reasonable cost, along with a jobs and manufacturing history.  Perfect opportunity, one not lost on our ancestors.

How Long should the Leadership vision be?

April 29, 2013
Climate, Environment, finance, groundwater, infrastructure, Leadership, management, planning, sustainability, Uncategorized, water sewer management, water supplies
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We do 5, 10 and 20 year plans for infrastructure.  But how long do we expect to this infrastructure to last?  For example, how many roads only last 10 or 20 years?  Most roads only seem to grow with time.  Ancient Roman roads are the basis for many current roads.  We keep adding roads – few are ever abandoned. They simply do not go away.   So a 5, 10 or 20 year planning period makes little sense.

Roads are not the only limit.  The WPA-era water mains are approaching 80 years old, and still providing good service, and our Clean Water Act-era sewer improvements are approaching 40.  Sewer lines are similarly situated.  Many water plants are over 70; we celebrate 100 years on many.  Again, planning for only 20 years makes little sense in the context of the larger length of time.

More interesting, we rarely borrow money to pay for these projects for less than 20, 30 or 40 years.  So our infrastructure outlives our plans and our borrowing.  Often permits are less that the borrowing for infrastructure, which can cause stranded capacity in plants that may never be used.  Miami-Dade County has such a situation – they are not alone.

Let’s look at this in the context of groundwater withdrawals.  There are areas across the US where groundwater levels have fallen. They have fallen because of human activity to pump them for crops and water use.  Colorado has a 100 year management plan in the Denver basin which is basically make the water last 100 years.  Then what?  Texas has shorter plans.  The eastern Carolina drained parts of the Black Creek already, so this is not a theoretical western state issue only.  How do we address this?

Or let’s go back to Miami-Dade County the outer banks of North Carolina, historical downtown Charleston, SC, and many other venues where sea level rise could impact water, sewer, storm water and roadway infrastructure. As we redevelop those area, should plans look at the true life of those assets (100 years) vs. the 20 year plan?

Both issues involve the sustainability of infrastructure systems, which means the ability to adapt them to changing future conditions.  We have known for 10-15 years that stationarity is no longer accepted for future projections.  But we need leadership to move the infrastructure planning to the future changing conditions.

When do we get serious about sea level rise?

March 18, 2013
Banking industry, Climate, Development loans, Environment, finance, groundwater, infrastructure, Insurance, Leadership, management, planning, sanitary sewer, sea level rise, stormwater, sustainability, Tidal flooding, Uncategorized, water sewer management, water supplies
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Based on my last blog, his inquiry came to me.  And I think I actually have an answer:  when bakers and insurance companies decide there is real exposure.  Let’s see why it will take these agencies.  There is very little chance, regardless of good faith efforts, significant expertise, or conscientious bureaucrats to stop growth and development.  The lobby is simply too strong and local officials are looking for ways to raise more revenues.  Development is the easiest way to increase your tax base.  As long as there are no limits placed on develop-ability of properties (and I don’t mean like zoning or concurrency), development will continue.  But let’s see how this plays out.  Say you are in an area that is likely to have the street inundated permanently with water as a result of sea level rise (it could be inland groundwater, not just coastal saltwater).  For a time public works infrastructure can deal with the problem, but ultimately the roadways will not be able to be cleared.  Or say you are located on the coast, and repeated storm events have damaged property.  In both cases the insurance companies will do one of three things:  Refuse to insure the property, insure the property (existing) only for replacement value (i.e. you get the value to replace) but no ability to get replacement insurance, or the premiums will be ridiculous.  We partially have this issue in Florida right now.  Citizen’s is the major insurer.  It’s an insurance pool created by the state to deal with the fact that along the coast, you cannot get commercial insurance.  So Citizens steps in.  The state has limited premiums, and while able to meet its obligations, in a catastrophic storm would be underfunded (of course in theory is should have paid out very little since 2006 since no major hurricanes have hit the state, but that’s another story). 

As the risk increases, Citizens and FEMA, the federal insurer, have a decision to make.  Rebuilding where repeated impacts are likely to happen is a poor use of resources and unlikely to continue.  Beaches and barrier islands will be altered as a result.  The need will be to move people out of these areas, so the option above that will be selected will be to pay to replace (move inland or somewhere else).  Then the banks will sit up.  The banks will see that the value of these properties will not increase.  In fact they will decline almost immediately if the insurance agencies say we pay only to relocate.  That means that if the borrowers refuse to pay, the bank may not be able to get its money out of the deal on a resale.  We have seen the impact on banks from the loss of property values as a result of bad loans.  We are unlikely to see banks engage in similar risks in the future and unlikely to see the federal insurers (Fannie Mae, Freddie Mac) or commercial re-insurers like AIG be willing to underwrite these risks.   So where insurance is restricted, borrowing will be limited and borrowing time reduced.  That will have a drastic impact on development.  The question is what local officials will do about it?

There are options to adapt to sea level rise, and both banking and insurance industries will be paying close attention in future years.  Local agencies will need a sea level rise adaptation plan, including policies restricting development, a plan to adapt to changing sea and ground water levels including pumping systems to create soil storage capacity, moving water and sewer systems, abandoning roadways, and the like, and hardening vulnerable treatment plants.  Few local agencies have these plans in place.  Many local officials along the Gulf states refuse to acknowledge the risk.  What does that say about their prospects?  Those who plan ahead will benefit.  Southeast Florid a is one of those regions that is planning, but it is slow process and we are only in the early stages.

Groundwater Accelerates Sea Level Rise

March 14, 2013
Climate, communciations, Development loans, Environment, funding, groundwater, infrastructure, Insurance, Leadership, management, planning, sea level rise, stormwater, sustainability, Tidal flooding, Uncategorized
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Regardless of the causes, southeast Florida, with a population of 5.6 million (one-third of the State’s population), is among the most vulnerable areas in the world for climate change due its coastal proximity and low elevation (OECD, 2008; Murley et al. 2008), so assessing sea level rise (SLR) scenarios is needed to accurately project vulnerable infrastructure (Heimlich and Bloetscher, 2011). We know that sea level has been rising for over 100 years in Florida (Bloetscher, 2010, 2011; IPCC, 2007). Various studies (Bindoff et al., 2007; Domingues et al., 2008; Edwards, 2007; Gregory, 2008; Vermeer and Rahmstorf, 2009; Jevrejeva, Moore and Grinsted, 2010; Heimlich, et al. 2009) indicate large uncertainty in projections of sea level rise by 2100. Gregory et al. (2012) note the last two decades, the global rate of SLR has been larger than the 20th-century time-mean, and Church et al. (2011) suggested further that the cause was increased rates of thermal expansion, glacier mass loss, and ice discharge from both ice-sheets. Gregory et al. (2012) suggested that there may also be increasing contributions to global SLR from the effects of groundwater depletion, reservoir impoundment and loss of storage capacity in surface waters due to siltation. The loss of groundwater, mainly from confined aquifers, is troubling, and currently completely unknown. The contribution of carbon dioxide, commonly occurring in deep groundwater is also unknown. To gauge the risk to property in southeast Florida, Southeast Florida Regional Climate Compact and Florida Atlantic University reviewed twelve different projections of SLR and its timing. The consensus was 3” to 7” by 2030 and 9” to 24” by 2060. From the literature review and analysis, it was concluded that approximately 3 ft. of sea level rise by 2100 would a suitable scenario and time frame to illustrate the methodology presented in this article. To allow flexibility in the analysis due to the range of increases within the different time periods, an approach that uses incremental increases of 1, 2, and 3 feet of SLR was considered for risk scenarios. An issue normally ignored in sea level rise projections is groundwater. The importance of the groundwater table in the model is that it is responsible for determining the soil storage capacity. Soil is composed of solids, water, and air (voids). Soil storage capacity depends on physical and chemical properties, water content of the soil, and depth to the water table or confining unit (Gregory et al 1999). As the rain infiltrates the soil, unsaturated pores quickly fill up, effectively raising the water table (Gregory et al 1999). For example efforts, a groundwater surface elevation map was derived based well site information available from the USGS (http://groundwaterwatch.usgs.gov) that had a minimum of 35 years of continuous data. Using GIS, an inundation model was created in GIS by subtracting the groundwater surface model from the digital elevation model with the difference in elevation being the soil storage capacity. The photo shows the evolution of these features as applied to a section of northwestern Miami-Dade County. What this indicates it that the impact of sea level rise on low-lying inland areas may be far different that the projections using the bathtub models. It also means that wellfields, sewer mains, roadways and storm water systems will be affected far more quickly than projected from bathtub models. The method used here suggested that the estimated may be off by a factor of two of three.