The most important parameters regulating algal growth are nutrient quantity and quality, light, pH, turbulence, salinity and temperature. Light is the most limiting factor for algal growth, followed by nitrogen and phosphorus limitations, but other nutrients are required including carbon. Biomass is usually measured by the amount of chlorophyll a in the water column. Water temperature influences the metabolic and reproductive rates of algae. Most species grow best at a salinity that is slightly lower than that of their native habitat, The pH range for most cultured algal species is between 7 and 9, with the optimum range being 8.2-8.7. Through photosynthesis, algae produce oxygen in excess of respiratory requirements during daylight hours. Conversely, during low light or nighttime periods algae respire (consume) dissolved oxygen, sometimes depleting water column concentrations. Thus, high algae concentrations may lead to low dissolved oxygen concentrations.
A common solution for algae is copper sulfate. Copper Sulfate works to kill the algae, but when it dies, it settles to the bottom of the water body where it becomes a carbon source for bacteria and future algae. One will often see shallow ponds with rising algae. But there is significant concern about copper in coastal water bodies. Copper is toxic to marine organisms so USEPA and other regulatory bodies are considering the limits on copper use. Such a limitation would severely limit options in dealing with algal blooms near coastal waters.
Mixing is necessary to prevent sedimentation of the algae, to ensure that all cells of the population are equally exposed to the light and nutrients. So oxygenation can help (it also mixes the water. The depth of south Florida water bodies is problematic (shallow and therefore warmer than normal). But oxygen will help microorganisms on the bottom consume the carbon source on the bottom, which might slow algal growth. Analysis is ongoing.
Two other conditions work against controlling blue-green algae outbreaks: climate change and political/regulatory decision-making. Lake Okeechobee has routine algal blooms from the nutrients introduced from agriculture and runoff around the lake, which encouraged an artificial eutrophication of the lake years ago. It continues today. Warmer weather will encourage the algal blooms in the future. The decisions to discharge the water without treatment is a political one. From a regulatory perspective, algae is seen as a nuisance issue, not a public health or environmental issue. But algal blooms consume oxygen and kill fish, so the ecosystem impact is considerable – it is not a nuisance .
The term algae encompass a variety of simple structures, from single-celled phytoplankton floating in the water, to large seaweeds. Algae can be single-celled, filamentous or plant-like, anchored to the bottom. Algae are aquatic, plant-like organisms – phytoplankton. Phytoplankton provides the basis for the whole marine food chain. Phytoplankton need light to photosynthesize so will therefore float near the top of the water, where sunlight reaches it. Light is the most limiting factor for algal growth, followed by nitrogen and phosphorus limitations), but other nutrients are required including carbon, silica, and other micronutrients. These microscopic organisms are common in coastal areas. They proliferate through cell division.
A natural progression occurs in many water bodies, from diatoms, to green algae to yellow/brown to blue-green, with time and temperature. The environment is important. Southern waters are characterized as being slow moving, and warm. This encourages cyanobacteria – or blue green algae. The introduction of nutrients is particularly difficult as it accelerates the formation of the blue green algae. Blue-green algae creates the bright green color, but is actually an end-of-progression organism.
If cells are present in the water mass in large numbers an algal bloom occurs. An algal bloom is simply a rapid increase in the population of algae in an aquatic system. Blooms may occur in freshwater as well as marine environments. Colors observed are green, bright green, brown, yellowish-brown, or red, although typically only one or a few phytoplankton species are involved and some blooms may be recognized by discoloration of the water resulting from the high density of pigmented cells.
So the desire for development created the idea to drain the swamp, which led to exposure of dark, productive soil that led to farming, which lead to fertilizers, which led to too much water, and water pollution leading to algae. A nice, predictable progression created by people. So what is the solution?
We have all seen the stories about land in the Everglades agricultural Area thissummer. I was asked to give a presentation at a national conference in Orlando recently about water management in Florida. It was a fun paper and most of the people there were not from Florida, so it was useful for them to understand the land of water. Florida has always been a land shaped by water. Initially it was too much, which frustrated federal soldiers trying to hunt down Native Americans in the 1830s. In 1881, real estate developer Hamilton Disston first tried to drain the swamps with canals. He was not successful, but Henry Flagler came through a decade later and constructed the east coast railroad in the 1890s. It is still there, 2 miles off the coast, on the high ground. However water limited development so in 1904, Napoleon Bonaparte Broward campaigned to drain the everglades. Broward’s efforts initiated the first land boom in Florida, although it was interrupted in the 1920s by hurricanes (1926 and 1928) that sloshed water out of Lake Okeechobee killing people and severely damaging property in Miami and around Lake Okeechobee. A dike was built (the Hover dike – it is still there). However, an extended drought occurred in the 1930s. With the dike preventing water from leaving Lake Okeechobee, the Everglades became parched. Peat turned to dust, and saltwater entered Miami’s wells. When the city brought in an expert to investigate, he found that the water in the Everglades was the recharge area for the Biscayne aquifer, the City’s water supply. Hence water from the lake needed to move south.
Resiliency has always been one of Florida’s best attributes. So while the hurricanes created a lot of damage, it was only a decade or two later before the boom returned. But in the late 1940s, additional hurricanes hit Florida, causing damage and flooding from Lake Okeechobee prompting Congress to direct the Army Corps of Engineers to build 1800 miles of canals, dozens of pump stations and other structures to drain the area south of Lake Okeechobee. It is truly one of the great wonders of the world – they drained half a state by lowering the groundwater table by gravity canals. To improve resiliency, between 1952 and 1954, the Corps, in cooperation with the state of Florida, built a levee 100 miles long between the eastern Everglades and the developing coastal area of southeast Florida to prevent the swamp from impacting the area primed for development.
As a part of the canal construction after 1940, 470,000 acres of the Everglades was set aside for farming on the south side of Lake Okeechobee and designated as the Everglades Agricultural Area (EAA). However water is inconsistent, so there are ongoing flood/drought cycles in agriculture. Irrigation in the EAA is fed by a series of canals that are connected to larger ones through which water is pumped in or out depending on the needs of the sugar cane and vegetables, the predominant crops. Hence water is pumped out of the EAA, laden with nutrients. Backpumping to Lake Okeechobee and pumping the water conservation areas was a practice used to address the flooding problem.
There was an initial benefit to Lake Okeechobee receiving nutrients. Older folks will recall that in the 1980s , the lake was the prime place for catching lunker bass. That was because the lake was traditionally nutrient poor. That changed with the backpumping which stimulated the biosystem productivity. More production led to more biota and more large fish. This works as long as the system is in balance e- i.e. the nutrients need to be growth limiting at the lower end of the food chain. Otherwise the runaway nutrients overwhelm the natural production and eutrophication results. Lake Okeechobee is a runaway system – the algae now overwhelm the rest of the biota. Lunker bass have been gone for 20 years.
The backpumped water is usually low in oxygen and high in phosphorus and nitrogen, which triggers algal progressions, leading to toxic blue-green algae blooms and threaten lake drinking water supplies. Think Toledo. Prolonged back pumping can lead to dead zones in the lake, which currently exist. The nutrient cycle and algal growth is predictable.
The Hoover Dike is nearly 100 years old and while it sit on top of the land (19 ft according to the Army Corps of Engineers), there is concern about it being breached by sloshing or washouts. Undermining appears in places where the water moves out of the lake flooding nearby property. So the Corps tries to keep the water level below 15.5 ft. During the rainy season, or a rainy winter as in 2016, that can become difficult. If the lake is full, that nutrient laden water needs to go somewhere. The only options are the Caloosahatchee, St. Lucie River or the everglades. The Everglades is not the answer for untreated water – the upper Everglades has thousands of acres of cattails to testify to the problem with discharges to the Everglades. So the water gets discharged east and west via the Caloosahatchee and St. Lucie River.
The nutrient and algae laden water manifests as a green slime that washed onto Florida beaches in the Treasure coast and southwest Florida this summer, algae is actually a regular visitor to the coasts. Unfortunately memories often fail in temporal situations. The summer 2016 occurrence is reportedly the eighth since 2004, and the most severe since 2013. The green slime looks bad, can smell bad, kills fish and the 2016 bloom was so large it spread through estuaries on both coasts killing at least one manatee. One can see if from the air – try this link:
The reliability of the assets within the area of interest starts with the design process in the asset management plan. Decision-making dictates how the assets will be maintained and effective means to assure the maximum return on investments. Through condition assessment, the probability of failure can be estimated. Assets can also fail due to a growing area that may contribute to exceeding its maximum capacity. Operation and maintenance of the assets are important in reassuring a longer life span as well as getting the most out of the money to be spent. Prioritizing the assets by a defined system will allow for the community to see what areas are most susceptible to vulnerability/failure, which assets need the most attention due to their condition, and where the critical assets are located in relation to major public areas (hospitals, schools, etc.) with a high population.
So what happens when conditions change? Let’s say sea levels are rising and your land is low. What would the potential costs be to address this? Better yet, what happens if it rains? We looked at one south Florida community and the flood stage for each based on 3 storm events: the 1:10 used by FDOT (Assumes 2.75 inches in 24 hours), the Florida Building Code event that includes a 5 in in one hour event (7 in in 24 hrs), and the 3 day 25 year event (9.5-11 inches).
Of no surprise is that the flooding increases as rainfall increases. Subsequent runs assumed revisions based on sea level rise. The current condition, 1, 2 and 3 ft sea level rise scenarios were run at the 99 percentile groundwater and tidal dates and levels. Tables 2-5 depict the flood stage results for each scenarios. The final task was designed to involve the development of scenarios whereby a toolbox options are utilized to address flooding in the community. Scenarios were to be developed to identify vulnerabilities and cost effectiveness as discussed previously.
The modeling results were then evaluated based of the accompanying infrastructure that is typically associated with same. A summary of the timelines and expected risk reductions were noted in the tables associated with storm and SLR scenarios. This task was to create the costs for the recommended improvements and a schedule for upgrading infrastructure will be developed in conjunction with staff. Two issues arise. First, the community needs to define which event they are planning to address and the timelines as the costs vary form an initial need of $30 million to over $300 million long-term. Figure 1 shows how these costs rise with respect to time. The long-term needs of $5 million per 100 acres matches with a prior effort in Palm Beach County.
Figure 1 Summary of Costs over the 3 ft of potential sea level Rise by 2011, under the 3 storm planning concepts.
Curtailed water use and conservation are common topics of conversation in areas with water supplies limitations. As drought conditions worsen, the need for action increases, so when creating a regulatory framework, or when trying to measure water use efficiency, water supply managers often look for easily applied metrics to determine where water use can be curtailed. Unfortunately, the one-size-fits-all mentality comes with a potential price of failing to fully grasp the consequences decision-making based on such metrics.
One of the issues that water supply regulator like to use is per capita water use. Per capital water use is often used to show where there is “wasted” water use, such as excessive irrigation. However such a metric may not be truly applicable depending on other economic factors, and may even penalize successful communities with diverse economic bases. A heavy industrial area or dense downtown commercial center may add to apparent per capita use, but is actually the result of vibrant economic activity. Large employment centers tend to have higher per capital use than their neighbors as a result of attracting employees to downtown, which are not included in the population.
In south Florida, a recent project I was involved with with one of my students showed that while there was significant variability among utilities, but the general trend of increased economic activity was related to increased per capita use. Among the significant actors were health care, retail trade, food service and scientific and technical services. It appears to be these sectors that drive water use upward. As a result when evaluating the efficiency of a utility, an analysis should be conducted on the economic sectors to insure that water regulations do not stifle economic growth and jobs in a community. And conversely if you do not have these sectors, you water use should be lower. Something to think about when projecting or regulating water use. Limited water use may in fact be limiting economic activity in the area. Of course if you are water limited, limited new withdrawals may be perfectly acceptable if you want to encourage other options, like direct or indirect potable reuse, irrigation, etc.
It would be interesting to expand this study across the country to see what the national trends look like and how different tourism oriented South Florida might actually be.
Most water suppliers realize that the more natural their land is upstream of their water supplies, the less risk there likely is for their customers. Under the source water protection programs that state, local officials and water utilities implement, the concept is to keep people related activities out, and let the natural forests and landscapes remain. For the most part the natural areas support only a limited amount of wildlife (sustainable) and thereby there natural systems are attuned to compensate for the natural pollutant loads, sediment runoff, ash, detrital matter, etc., that might be created through natural processes. For thousands of years these systems operated sustainably. When people decide there needs to be changes, it seems like the unanticipated consequences of these actions create more problems. Now many of these same ecosystems do not work sustainably and water quality has diminished, increasing the need for treatment and the risks of contamination to the public. It would be better, but decidedly less popular on certain fronts, to provide more protection to natural systems that extend into watersheds (which is most of them), not less.
So this leads to a series of questions that go to the greater questions about natural environments:
Is it really necessary to cull the small Yellowstone bison herd by 1000? What do bison have to do with watersheds? Well, the bison create much less damage to grasslands and underlying soil than cattle due to the size of their hooves. An argument is that we need to cull the herd because they transmit disease to cattle, but Brucellosis has never been demonstrated to move from bison to cattle, so disease is not an answer. What is really happening is that there is competition between buffalo and cattle for grazing. Competition with cattle means that the cattle are on public property, not private ranch lands, and the cattle trample the public lands which creates the potential for soil erosion and sediment runoff. So I am thinking water folks should be siding with the bison. Of course without wolves, there is no natural predator for bison, which raises a different sustainability problem, so maybe instead of killing them, we move them to more of their native ranges – maybe some of those Indian reservation might want to restart the herds on their lands? That might be good for everyone, water folks included.
Part 2 – is it necessary to continue to protect wolves or should we continue to hunt them in their native ranges? Keep in mind wolf re-introduction efforts are responsible for most of the wolf populations in the US, specifically in the Yellowstone area. Without wolves, there is no control of large grazing animal populations (see bison above, but also elk and deer), and there is a loss of wetland habitat because the elk eat the small shoots used by beavers to build dams and trap sediment. Eliminating wolves has been proven to create imbalance. Wolves = sediment traps = better water quality downstream. Sounds like a win for everyone. (BTW there is a program in Oregon to protect wolves and help ranchers avoid periodic predation of calves by wolves so they win too).
Part 3 – Is it really necessary to kill off coyotes in droves? The federal government kills thousands of coyotes and hunters and others kill even more. This is a far more interesting question because it leads to one of those unintended consequences. !100+ years ago people decided wolves were bad (we still have this issue ongoing – see above). So we eradicated wolves. No wolves means more rodents, deer, elk, etc. which mean less grass, less aspens and less beavers, which means more runoff which does not help water suppliers. It also means more coyotes, because there is more food for the coyotes. Interesting that coyotes have pretty much covered the entire US, when their ranges were far more limited in the past. Coyotes are attracted to the rodents and rabbits. But the systems are generally not sustainable for coyotes because there is not enough prey and there is no natural control of the coyotes – again, see wolves above. A Recent Predator defense report indicates that culling coyotes actually increases coyote birth rate and pushes them toward developed areas where they find cats and small dogs, unnatural prey. Not the best solution – unintended consequences of hunting them on more distant land pushes them into your neighborhood. Not the consequence intended. So maybe we keep the small dogs and cat inside at daybreak and nightfall when the coyotes are out and let them eat the rats and mice that the cats chase and once consumed they go away. Coyotes need to eat grazers and rodents but you need the right mix or the grazers overgraze, which leads to sediment runoff issues – which is bad for us. That also seems like a win.
Everglades restoration is a big south Florida issue. The recharge area for the Biscayne aquifer is the Everglades. So water there seems like a win for water suppliers? So why aren’t we the biggest Everglades advocates out there? Still searching for that answer, but Everglades restoration is a win for us and a win for a lot of critters. Federal dollars and more federal leadership on restoration is needed. Which leads to ….
Do we need more, not less management of federal lands? Consider that the largest water manager in the west is the federal government, which has built entire irrigation systems to provide water to farmers who grow crops in places that are water deficient. Those farms then attract people to small towns that consume more of the deficient water. Then people lobby to let cattle graze on those public lands (see bison above), timber removal – which increases sediment erosion, or mining (what could possible go wrong there?). So since the federal government manages these lands, wouldn’t better regulations and control to keep the federal properties more protected benefit water users and suppliers? Contrary to the wishes of folks like the guys holed up in a federal monument in Oregon, or the people who have physically attacked federal employees in Utah and Nevada, more regulations and less freedom is probably better in this situation for the public good. If we are going to lease public lands (and most lands leased are leased to private parties for free or almost free), and there should be controls on the activities monitoring for compliance and requirements for damage control caused by those activities. There should be limits on grazing, timber and mining, and monitoring of same. Lots of monitoring. It is one of the things government really should do. And we need it to protect water users downstream. Again a win for water suppliers.
So as we look at this side issue, ecosystems, bison, wolves, coyotes and the Everglades seem very distant from our day-to-day water jobs. But in reality they are not. We should consider the impacts they might have on water supply, keeping in mind natural system decisions are often significantly linked to our outcomes, albeit the linkage is not always obvious.
In my last blog I introduced our ethics project we hope to make progress on. But here is one of the interesting questions, especially in Florida. I could not find any actual laws or rules issues here, but it is increasingly common for big engineering contracts to have lawyers, lobbyists, etc. get involved in what is intended to be a qualifications based selection process? There is an interesting issue raised in 287.055 FS (CCNA) where the legal intent is that governmental agencies “shall negotiate a contract with the most qualified firm for professional services at compensation which the agency determines is fair, competitive, and reasonable.” Most states use credentials and qualifications for selection as opposed to cost, because the lowest cost may not get you the best job. You want people doing engineering that have experience with the type of project you are doing. This has come up to me with storage tanks, membrane plans, deep wells, etc. You want someone that has done it before, not someone who is cheaper but hasn’t. There is too much at risk.
In addition the statute is fairly specific about contingent fees (as are most states):
Ch 287.055 (6) PROHIBITION AGAINST CONTINGENT FEES.—
(a) Each contract entered into by the agency for professional services must contain a prohibition against contingent fees as follows: “The architect (or registered surveyor and mapper or professional engineer, as applicable) warrants that he or she has not employed or retained any company or person, other than a bona fide employee working solely for the architect (or registered surveyor and mapper, or professional engineer, as applicable) to solicit or secure this agreement and that he or she has not paid or agreed to pay any person, company, corporation, individual, or firm, other than a bona fide employee working solely for the architect (or registered surveyor and mapper or professional engineer, as applicable) any fee, commission, percentage, gift, or other consideration contingent upon or resulting from the award or making of this agreement.” For the breach or violation of this provision, the agency shall have the right to terminate the agreement without liability and, at its discretion, to deduct from the contract price, or otherwise recover, the full amount of such fee, commission, percentage, gift, or consideration.
So here is the question: As the public becomes more aware of these types of political lobbying activities, does it move the perception of engineers away from a profession and more towards profession toward developers, lawyers and others who are often seen as less ethical than perhaps engineer, doctors, educators, and scientists? And if so, is this good for either the engineering profession or the local governments (and their utilities) involved in the selection process? The comment that “that’s how business get done” is not an acceptable argument when the priority purpose of engineers, and utility operators is the protection of the HEALTH, SAFETY AND WELFARE OF THE PUBLIC. Somehow I think the politicizing of engineering contracts does not help our profession. Looking forward to your thoughts.
My apologies for being offline for a month. It has been very busy. I got back from Utah, and it was tests, reports, etc. Then Thanksgiving – we went to Disney for my stepdaughter. Then the Florida Section AWWA conference, then student final design presentations with President Kelly present for some of it, then finals, then a trip to the west coast, then posting grades, then it’s now. Crazy. And my kitchen is being worked on -see the photos of what is left of it. Not much, and Christmas is how far away. Yikes. At least the wrapping and chopping are 99% done!
In the meantime a lot has happened. Congress cut SRF funding, but passed the transportation bill. They passed WITAF, but provided minimal funding. The debates roll on. A recent South Park episode is all about illegal immigrants from Canada escaping, then there is a wall built, by the Canadian so t hose who left don’t come back, and then we find out who the new president in Canada looks like… well you just have to watch and be scared. Very scared. If you do not follow South Park, well you are just missing it.
Russia had a plane brought down by an apparent ISIS bomb. The Egyptians deny it. Too much arguing about was it or wasn’t it to garner much of an outcry. Best wishes to the friends and families of the victims. Then France had their 911 event sponsored by ISIS, and most of the world is sending their best wishes to the victims, the victims families and the French population. In such events, most of the world comes together. Everybody was French for a day. Best wishes to the friends and families of the victims. Then the couple in California. Best wishes to the friends and families of the victims. But it raises a very disconcerting question, and one fraught with far too many xenophobic concerns as ISIS and their allies like the Taliban, Boko Hiram and others continue to reign terror and violence on the rest of the world. The xenophobic response will be – whom do we trust in the Muslim world? If you don’t believe in blowback, listen to the debates. One commentator points out the xenophobia may actually help ISIS (Donald are you listening?). LOL – of course not. But utilities should expect another round of security costs and analyses in the future.
The Florida Section conference was great. The venue was great (Renaissance at Sea World). The program garnered a lot of buzz and comments. Who knew at a water conference that potable reuse would be the big topic? I also won two awards at the Florida Section conference – a best paper award and the Alan B. Roberts award for Outstanding Service by a member. Wow!! I am humbled. A lot of great utility folks were present at the FSAWW conference. It is a great event for the water industry (that includes wastewater, storm water etc.). The technical program is designed to be good, timely and useful to those that attend. While all utilities struggle with costs, please make time to send your folks if possible. The training cost is reasonable for what you get and who you meet.
My students did well on tests and presentations. President Kelly was impressed with their presentations and projects at the Dean’s Design Showcase. We have never had the Dean at student presentations, let alone the President of the University. My sincere appreciation to him, his staff and those that made it happen. The students were pleased and impressed. And they are getting jobs easily. You can tell people are building and working on infrastructure as most of the graduates get jobs right away, if they don’t have them already.
Grading and the west coast went well. The Fort Myers News Press-Sunday Headline was “Where has all the water gone” – a discussion on how groundwater is depleting across the country including south Florida which gets 60 inches of rain. But the article points out what that climate, rainfall, recharge and other factors have been altered in south Florida as a result of development. We really do make an impact and it is affecting utilities today. This follows another article last week on depleted groundwater around the world. I have lots of photos in my travels from the air – groundwater use is highest where surface waters are limited – i.e. dry areas. Except in dry areas, the groundwater does not recharge. I had a student do a project for his master’s degree that estimated that groundwater depletion is a measureable percentage of sea level rise. More to come on that.
Next the kitchen. I will post photos in another blog.
As I said, a busy month.
We are all aware of the major drought issues in California this year – it has been building for a couple years. The situation is difficult and of course the hope is rain, but California was a desert before the big water projects on the 1920s and 30s. Los Angeles gets 12 inches of rain, seasonally, so could never support 20 million people without those projects. The central valley floor has fallen over 8 feet in places due to groundwater withdrawals. Those will never come back to levels of 100 years ago because the change in land surface has collapsed the aquifer. But the warm weather and groundwater has permitted us to develop the Central Valley to feed the nation and world with produce grown in the desert. The development in the desert reminds me of a comment I saw in an interview with Floyd Dominy (I think), BOR Commissioner who said his vision was to open the west for more people and farming, and oversaw lots of projects to bring water to where there was none (Arizona, Utah). The problem is that the west never head much agriculture or population because it was hot, dry and unpredictable – hence periodic droughts should be no surprise – the reason they are a surprise is that we have developed the deserts far beyond their capacity through imported water and groundwater. Neither may be reliable in the long run and disruptions are, well, disruptive. Archaeologist Bryan Fagan traced the fall of Native American tribes in Arizona to water deficits 1000 years ago.
Yet policymakers have realized that civil engineers have the ability to change the course of nature, at least temporarily, as we have in the west, south, Florida. I often say that the 8th and 9th wonders of the world are getting water to LA over the mountains and draining the southern half the state of Florida. I have lived in S. Florida for 25+ years and am very familiar with our system. The difference though is that we have the surficial Biscayne aquifer and a rainy season that dumps 40 inches of rain on us and LA doesn’t (as a note of caution, for the moment we are 14 inches below normal in South Florida – expect the next drought discussion to ensue down here in the fall). The biggest problems with the Everglades re-plumbing are that 1) no one asked about unintended consequences – the assumption was all swamps are bad, neglecting impacts of the ecosystem, water storage, water purification in the swamp, control of feedwater to Florida Bay fisheries, ….. 2) one of those unintended consequences is that the recharge area for the Biscayne aquifer is the Everglades. So less water out there = less water supply along the coast for 6 million people 3) we lowered the aquifer 4-6 ft along the coastal ridge, meaning we let saltwater migrate inland and contaminate coastal wellfields 4) we still have not figured out how to store any of that clean water – billions o gallons go offshore every day because managing Lake Okeechobee and the upper Everglades was made much more difficult when the Everglades Agricultural Area was established on the south side of Lake Okeechobee, which means lots of nutrients in the upper Everglades, and a lack of place for the lake to overflow, which meant dikes, more canals, etc. to deal with lake levels.
The good news is that people only use 11% of the water in California and Florida, and that Orange County, CA and others have shown a path to some degree of sustainability (minus desal), but the real problem is water for crops and the belief that communities need to grow. When we do water intensive activities like agriculture or housing, in places where it should not be, it should be obvious that we are at risk. Ultimately the big issue it this – no policy makers are willing to say there is “no more water. You cannot grow anymore and we are not going to send all that water to Ag.” Otherwise, the temporary part of changing nature will come back to haunt us.