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An Assessment of the Salton Sea Water Importation Options

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An Assessment of the Salton Sea Water Importation Options RESEARCH ARTICLE Boons or boondoggles: An assessment of the Salton Sea water importation options Importing ocean water from the Sea of Cortés to the Salton Sea would be substantially more expensive than leasing agricultural water from the Imperial Valley and transferring it to the Salton Sea. by Lucia Levers, S. Drew Story and Kurt Schwabe Online: https://doi.org/10.3733/ca.2020a0009 he second-lowest point in the United States, the Imperial Irrigation District (IID) to the San Diego an ancient seabed, was flooded at the turn of County Water Authority (SDCWA). The agreement also T the 20th century by Colorado River water be- mandated that the Imperial Irrigation District send ad- ing brought into California, forming the Salton Sea. ditional water to the Salton Sea — through 2017 — from Named La Palma de la Mano de Dios (the Palm of the its several million acre-feet of Colorado River water en- Hand of God) by pre-statehood Mexicans (Darton titlement to counter the decreases in Salton Sea inflow 1933), the sink has since continuously remained sub- that would arise from this transfer. merged. The Salton Sea exists today due to agricultural drainage water, the vast majority of which flows from the farmlands of the Imperial Valley — the fingers of la Abstract Mano. During the 20th century, California and north- ern México lost almost all of their wetlands, leaving the Several ways to address the looming ecological disaster that is the Salton Sea an incongruous combination of a drainage Salton Sea have been proposed — including water importation. water sink and critical habitat for millions of migratory Here we considered two options: importing ocean water from birds and several endemic, endangered and sensitive the Sea of Cortés and leasing water from agricultural users in the species. Imperial Valley. We estimated the monetary costs for importing Critical habitat or not, as a terminal lake, the Sea has Sea of Cortés water to the Salton Sea and compared that with significantly deteriorated due to the declining quality the costs of transferring water from agricultural users to the and quantity of its inflows. Nearly 85% of the inflows are Salton Sea. We found that leasing water from agriculture would from agricultural drainage, which brings with it fertiliz- be substantially cheaper than ocean water imports. Additionally, ers, pesticides and salts that have caused a salinity level all the infrastructure for leasing water from growers exists, which intolerable to most fish (Schwabe et al. 2008). In 2003, means water transfers could begin immediately. That is important a federal-state-local agreement — the Quantification given the present and increasing environmental and human health Settlement Agreement — formalized an agriculture- damages that are occurring at the Salton Sea. to-urban water transfer of Colorado River water from A heron in flight above foraging gulls. Due to the Salton Sea's decreasing volume and increasing salinity levels, all but one fish species has died off and the diversity of waterbirds has been in decline. Transferring water from agricultural users to the Salton Sea is a potential solution for preventing future habitat loss. http://calag.ucanr.edu • APRIL–JUNE 2020 73 Barbara BarryBarbara This “mitigation” water was an attempt to buy damages are estimated to be upward of $70 billion over time to develop solutions for the Salton Sea and avert 30 years, which does not include damages to the people damages caused by decreased volume and increased in México who live within the Salton Sea airshed salinization. However, solutions were delayed, the (Cohen 2014; Schwabe and Baerenklau 2007). Sea’s volume fell and its salinity concentrations rose “Fixing” the Sea will require reversing the habitat from 2003 through 2017. Since the cessation of mitiga- loss and playa exposure trends, which means address- tion water at the end of 2017, the decline in the quality ing the quantity and quality of water in the Salton and quantity of the inflows to the Sea has accelerated, Sea, and understanding that quality is influenced by furthering concerns over environmental and human inflow volume. A central and controversial issue is health damages and culminating in a recent unani- where the water is going to come from to maintain the mous emergency declaration by the county’s supervi- Sea. One proposal that the state is considering — the sory board (Wilson 2019a). Cortés-to-Salton option — consists of importing ocean One category of damages is habitat loss — all but water from the Sea of Cortés (also known as the Gulf one fish species has died off in the Salton Sea’s main of California). An alternative option, which builds body. This sole fish species, a hybrid tilapia, serves as upon the over 30-year history of agriculture-to-urban the primary food source for migratory bird populations transfers in the region as well as the Quantification (Bradley and Yanega 2017). Unfortunately, winter 2019 Settlement Agreement’s mitigation water transfer prec- fish surveys revealed few remaining tilapia and, conse- edent, is an agriculture-to-environment water transfer, quently, extremely low bird counts (Wilson 2019b). If described in Levers et al. (2019). the current salinity trends continue, only brine shrimp Higher inflows from either of these options would and brine flies will survive. These creatures tolerate decrease playa exposure and the associated human quite high salinity, but their upper limit of tolerance health impacts. The Salton Sea is a terminal lake, which will be surpassed in roughly 15 years (Bradley 2018). means that eventually the rise in salinity will result in At that point, algal and microbial populations will a dead sea. As such, a permanent solution to reverse grow exponentially, leaving the Sea biologically active environmental, health and recreational damages will but incapable of supporting its endangered, threat- require some machinations beyond simply bringing in ened and migratory species (Bradley 2018; Cohen and more water. However, inflows could also be used with Hyun 2006). habitat and dust suppression projects, even just in the Human health damages are another significant con- short term, reversing past and preventing future habitat cern. As the Sea recedes, the former sea bottom — that loss and playa exposure. is, the playa — is exposed. The playa is a source of air- We evaluated the costs associated with two op- borne particulates, a precursor/exacerbator of asthma tions for increasing inflows: ocean water imports, and and other lung conditions, which is particularly con- agriculture-to-environment voluntary, albeit compen- A tilapia carcass. Hybrid cerning to the lower-income communities surround- sated, water transfers. While an understanding of the tilapia are the main fish in the Salton Sea. While salt ing the Salton Sea, of whom a substantial portion have respective and relative costs of each option is important tolerant, even they are Latinx and/or Native American heritage (Abrams 2017; in informing policy — the goal of this paper — cost is reaching their salinity limit, Johnson 2019a, 2019b; Marshall 2017). only one of the factors to consider. Three other factors with numbers declining Combining the environmental and health costs are the legal and political issues surrounding each op- precipitously in recent with decreased property and recreational values, total tion, their respective benefits, and their potential envi- years. ronmental damages. Legal and political issues ultimately determine proposal feasibility and possible implementation. Both options — ocean water imports and agriculture-to- environment water transfers — will face significant political and legal challenges. In terms of the respec- tive benefits of the two options, our analysis focuses on comparing the costs of different options to bring water to the Sea, a question raised in the Salton Sea 10-Year Plan (CNRA 2017a). As such, the benefits of these solutions to the state’s charge of importing water to the Salton Sea are likely to be very similar. In terms of environmental damages, while ocean water impor- tation may offer an opportunity to further address regional water security in the Southwest, it also opens up the possibility of significant environmental impacts to the Sea of Cortés. Clearly, there is a different array of benefits associated with such a broader system, but such an analysis goes beyond the more targeted scope Christopher Rymer Christopher of this paper. 74 CALIFORNIA AGRICULTURE • VOLUME 74, NUMBER 2 the Metropolitan Water District and the Palo Verde Ocean water imports A lone nest, likely Irrigation District for approximately another 100 TAF belonging to a The idea to build a pipeline system to import ocean of agriculture water; and the transfers outlined in the cormorant pair. Double- water to the Salton Sea has been around since at least Quantification Settlement Agreement between the crested cormorants used the 1970s (Goldsmith 1971; Goolsby 2015). The two Imperial Irrigation District and the San Diego County to nest by the thousands alternatives for uptake locations are the Pacific Ocean Water Authority (SDCWA), culminating in 200 TAF at the Salton Sea, but no near San Diego and the Sea of Cortés in México. The of agriculture water being transferred to the San Di- longer. U.S. coastline is closer than the Sea of Cortés, approxi- ego County Water Authority (IID, SDCWA 2003; U.S. mately 100 miles compared to 160 miles, respectively, Bureau of Reclamation 2018). The transferred water from the Salton Sea. However, the elevation of the Pen- is “generated” by reducing both conveyance losses insular Ranges, west of the Salton Sea, would compli- through lining canals and field-level water application cate the journey of water pumped from the Pacific. So, through land fallowing and improving irrigation sys- the Mexican route has been singled out as easier — that tem efficiency. The transfers have mostly consisted of is, cheaper —even though it would necessitate an inter- agriculture-to-urban transfers, with some agriculture- national pipeline (Cohen 2015).
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