{"id":39283,"date":"2025-02-19T08:00:21","date_gmt":"2025-02-19T12:00:21","guid":{"rendered":"https:\/\/www.fondriest.com\/news\/?p=39283"},"modified":"2025-10-06T16:49:54","modified_gmt":"2025-10-06T20:49:54","slug":"from-pans-to-buoys-advancing-reservoir-evaporation-rate-monitoring-in-texas","status":"publish","type":"post","link":"https:\/\/www.fondriest.com\/news\/from-pans-to-buoys-advancing-reservoir-evaporation-rate-monitoring-in-texas.htm","title":{"rendered":"From Pans to Buoys: Advancing Reservoir Evaporation Rate Monitoring in Texas"},"content":{"rendered":"<p>In warmer climates like Texas, high reservoir evaporation rates can lead to declines in water level and water availability during droughts, making monitoring essential in order to ensure water security during times of scarcity.<\/p>\n<p>According to the <a href=\"https:\/\/www.twdb.texas.gov\/\" target=\"_blank\" rel=\"noopener\">Texas Water Development Board<\/a> (TWDB), evaporation rates in Texas were previously based on data collected from a sparse network of Class A evaporation stations, dating back to the 1960s. These pans were stationed near reservoirs and still remain a widely accepted standardized approach to measuring evaporation rates on land.<\/p>\n<p>Monthly pan-to-lake coefficients were developed in the 1980s to connect the data collected from the pans to known lake conditions, extrapolating evaporation rates of the lakes using the pan data.<\/p>\n<p>\u201cWe were acutely aware of the uncertainties associated with reservoir evaporation rates based on Class A pan evaporation data. We were also aware of advances being made by the <a href=\"https:\/\/www.usbr.gov\/\" target=\"_blank\" rel=\"noopener\">U.S. Bureau of Reclamation<\/a> and the <a href=\"https:\/\/www.dri.edu\/\" target=\"_blank\" rel=\"noopener\">Desert Research Institute<\/a> in observing open water evaporation, and that accurate estimation of reservoir evaporation requires that measurements be taken on the lake,\u201d states Dr. Nelun Fernando, Manager of the TWDB\u2019s Water Availability Program.<\/p>\n<div id=\"attachment_39285\" style=\"width: 950px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-39285\" class=\"size-full wp-image-39285\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2025\/02\/Choke_Canyon_buoy_deployment-1_ForWeb.jpg\" alt=\"Buoy on Choke Canyon Reservoir.\" width=\"940\" height=\"705\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/Choke_Canyon_buoy_deployment-1_ForWeb.jpg 940w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/Choke_Canyon_buoy_deployment-1_ForWeb-300x225.jpg 300w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/Choke_Canyon_buoy_deployment-1_ForWeb-600x450.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/Choke_Canyon_buoy_deployment-1_ForWeb-768x576.jpg 768w\" sizes=\"auto, (max-width: 940px) 100vw, 940px\" \/><p id=\"caption-attachment-39285\" class=\"wp-caption-text\"><span style=\"color: #808080;\">Buoy on Choke Canyon Reservoir. (Credit: A. Burke, TWDB)<\/span><\/p><\/div>\n<h3><span style=\"color: #808080;\">Monitoring Reservoir Evaporation Rates<\/span><\/h3>\n<p>Andy Weinberg, Team Lead for the Recorder Well Program in the Groundwater Monitoring Department at the TWDB, collaborated with the TWDB\u2019s Water Availability Department to establish an experimental floating eddy covariance station in 2018.<\/p>\n<p>The experimental platform measures the exchange of gases in a closed system and can help the TWDB better understand how climate conditions influence lake resources.<\/p>\n<p>Building on the experience gained through the trial, Weinberg and Dr. Fernando jointly developed the scope of work for the grant application to the U.S. Bureau of Reclamation\u2019s <a href=\"https:\/\/www.usbr.gov\/watersmart\/\" target=\"_blank\" rel=\"noopener\">WaterSMART<\/a> Drought Resiliency fund, which was used to purchase the equipment needed to develop the evaporation rate monitoring network across four major water supply reservoirs.<\/p>\n<p>\u201cThe project\u2019s goals are to strengthen reservoir evaporation monitoring in Texas and build correlations between the last 60-plus years of monitoring based on Class A evaporation pan stations and a 21st century program that takes advantage of new technologies,\u201d explains Dr. Fernando.<\/p>\n<p>Four total <a href=\"https:\/\/www.nexsens.com\/products\/data-buoys\/cb-650\" target=\"_blank\" rel=\"noopener\">NexSens CB-650 buoys<\/a> were deployed across Lake Buchanan, Choke Canyon Reservoir, Lake Meredith, and Red Bluff Reservoir. Each system was equipped with <a href=\"https:\/\/www.fondriest.com\/products\/weather.htm\" target=\"_blank\" rel=\"noopener\">meteorological<\/a> and <a href=\"https:\/\/www.fondriest.com\/products\/water-quality.htm?category_ids=734\" target=\"_blank\" rel=\"noopener\">water temperature sensors<\/a>, which continuously collect the data needed to estimate reservoir evaporation.<\/p>\n<p>The buoy stations report meteorological and water temperature data at 5-minute intervals, synching with the <a href=\"http:\/\/www.texmesonet.org\" target=\"_blank\" rel=\"noopener\">TexMesonet<\/a> network\u2019s data reporting frequency.<\/p>\n<p>In addition to the buoys, the program also pulls data from the Collison Floating Evaporation Pan system on Twin Buttes Reservoir, which collects meteorological data and measures evaporative water loss in a pan deployed in the reservoir.<\/p>\n<p>While there is <a href=\"https:\/\/journals.ametsoc.org\/view\/journals\/bams\/99\/1\/bams-d-15-00224.1.xml\" target=\"_blank\" rel=\"noopener\">evidence<\/a> that shore-based meteorological measurements can be used to replicate pan readings (Harwell, 2012), correlating these shore-based measurements with actual lake evaporation remains a challenge.<\/p>\n<p>Dr. Fernando elaborates, \u201cDifferences in micro-meteorological conditions between the lake and shore sites and the complex energy storage and release dynamics in large reservoirs suggest that accurate estimation of reservoir evaporation requires measurements taken on the lake.\u201d<\/p>\n<div id=\"attachment_39290\" style=\"width: 950px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-39290\" class=\"wp-image-39290 size-full\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2025\/02\/20240814_115854_ForWeb.jpg\" alt=\"Maintenance of an evaporation monitoring buoy on Choke Canyon Reservoir.\" width=\"940\" height=\"940\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/20240814_115854_ForWeb.jpg 940w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/20240814_115854_ForWeb-300x300.jpg 300w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/20240814_115854_ForWeb-600x600.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/20240814_115854_ForWeb-150x150.jpg 150w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/20240814_115854_ForWeb-768x768.jpg 768w\" sizes=\"auto, (max-width: 940px) 100vw, 940px\" \/><p id=\"caption-attachment-39290\" class=\"wp-caption-text\"><span style=\"color: #808080;\">Maintenance of buoy on Choke Canyon Reservoir. (Credit: A. Burke, TWDB)<\/span><\/p><\/div>\n<h3><span style=\"color: #808080;\">Using Evaporation Data<\/span><\/h3>\n<p>The TWDB is the state agency charged with ensuring a secure water future for Texas. It is responsible for collecting, compiling, and disseminating data to monitor, quantify, and simulate surface water and groundwater conditions; assisting with regional water supply and flood planning; and managing cost-effective financial programs for constructing water supply, wastewater treatment, flood control, and agricultural water conservation projects.<\/p>\n<p>The TWDB\u2019s Water Availability Department is responsible for interpreting and sharing the data collected at Class A evaporation pans located within Texas and neighboring states. The data collected by the pans are used as input to the water availability models for Texas that are used to determine water permitting and long-range water planning.<\/p>\n<p>Additionally, the data collected from the buoy stations are being used to calibrate and validate a new modeled, reservoir-specific evaporation data set for Texas (Zhao et al., 2024) and to update the legacy pan-to-lake coefficients for reservoirs that have both a pan station and a buoy.<\/p>\n<p>Notable findings from the buoy stations include observations of sub-daily spikes in evaporation that coincide with wind gusts on the lake, something not captured by the modeled data. Additionally, wind speeds and dewpoint temperatures measured by the buoys differ from the land-based pans.<\/p>\n<p>\u201cWhile this is not surprising, it reinforces the need to collect measurements over water because the land-based data may not accurately represent conditions over water,\u201d states Dr. Fernando.<\/p>\n<p>Though the buoys come with additional maintenance needs\u2014compared to the floating eddy covariance station\u2014the data collected on the lake is critical to calibrating the evaporation rate models currently used for reservoir operations.<\/p>\n<p>Dr. Fernando adds, \u201cFurthermore, the water column profile temperature data and solar radiation data collected at the buoys are invaluable for estimating the energy budget for reservoirs which is [\u2026] used to validate modeled reservoir evaporation rates and to close the energy budget for eddy covariance measurements.&#8221;<\/p>\n<div id=\"attachment_39291\" style=\"width: 950px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-39291\" class=\"size-full wp-image-39291\" src=\"https:\/\/www.fondriest.com\/news\/wp-content\/uploads\/2025\/02\/CC_Main_33122-3_ForWeb-1.jpg\" alt=\"Buoy on Choke Canyon Reservoir. (Credit: A. Burke, TWDB)\" width=\"940\" height=\"940\" srcset=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/CC_Main_33122-3_ForWeb-1.jpg 940w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/CC_Main_33122-3_ForWeb-1-300x300.jpg 300w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/CC_Main_33122-3_ForWeb-1-600x600.jpg 600w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/CC_Main_33122-3_ForWeb-1-150x150.jpg 150w, https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/CC_Main_33122-3_ForWeb-1-768x768.jpg 768w\" sizes=\"auto, (max-width: 940px) 100vw, 940px\" \/><p id=\"caption-attachment-39291\" class=\"wp-caption-text\"><span style=\"color: #808080;\">Buoy on Choke Canyon Reservoir. (Credit: A. Burke, TWDB)<\/span><\/p><\/div>\n<h3><span style=\"color: #808080;\">Conclusion<\/span><\/h3>\n<p>Ultimately, the buoys have helped further refine evaporation rate research in Texas. This data will go on to help develop solutions and \u201ccrack the puzzle\u201d on how much water is lost through evaporation in water supply reservoirs, according to Dr. Fernando.<\/p>\n<p>She continues, \u201cThe knowledge gained from the datasets we collect are used operationally for water management decisions, and it is rewarding to know that the enhancements we have implemented to improve the accuracy of reservoir evaporation data will directly contribute to improving assessments of current and future surface water availability in the state.\u201d<\/p>\n<p><strong>References<\/strong><br \/>\nHarwell, G.R., 2012, Estimation of evaporation from open water\u2014A review of selected studies, summary of U.S. Army Corps of Engineers data collection and methods, and evaluation of two methods for estimation of evaporation from five reservoirs in Texas: U.S. Geological Survey Scientific Investigations Report 2012\u20135202, 96 p.<\/p>\n<p>Zhao, B., Huntington, J., Pearson, C., Zhao, G., Ott, T., Zhu, J., Weinberg, A., Holman, K. D., Zhang, S., Anderson, R., Strickler, M., Cotter, J., Fernando, N., Nowak, K., &amp; Gao, H. (2024). Developing a General Daily Lake Evaporation Model and Demonstrating Its Application in the State of Texas. <em>Water Resources Research<\/em>, 60(3), e2023WR036181. https:\/\/doi.org\/10.1029\/2023WR036181<\/p>\n","protected":false},"excerpt":{"rendered":"<p>In warmer climates like Texas, high reservoir evaporation rates can lead to declines in water level and water availability during droughts, making monitoring essential in order to ensure water security during times of scarcity. According to the Texas Water Development Board (TWDB), evaporation rates in Texas were previously based on data collected from a sparse [&hellip;]<\/p>\n","protected":false},"author":42,"featured_media":39285,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2371,2372,23,5,32,7,8,510],"tags":[91,2244,1772,2493,126,1024,2582,2194,121,2583,2584,1729],"class_list":["post-39283","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-buoy","category-data-buoy","category-earth-atmosphere","category-featured-articles","category-lakes-reservoirs","category-news","category-newsfeed","category-water-quality","tag-buoy","tag-buoy-monitoring","tag-buoy-system","tag-climate-monitoring","tag-data-buoy","tag-desert-research-institute","tag-evaporation-data","tag-monitoring-buoy","tag-temperature","tag-texas-water-development-board","tag-u-s-bureau-of-reclamation","tag-weather-data"],"remote_post_permalink":false,"remote_post_featured_image":false,"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>From Pans to Buoys: Advancing Reservoir Evaporation Rate Monitoring in Texas<\/title>\n<meta name=\"description\" content=\"High reservoir evaporation rates can lead to declines in water level and water availability during droughts, making monitoring essential.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.fondriest.com\/news\/from-pans-to-buoys-advancing-reservoir-evaporation-rate-monitoring-in-texas.htm\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"From Pans to Buoys: Advancing Reservoir Evaporation Rate Monitoring in Texas\" \/>\n<meta property=\"og:description\" content=\"High reservoir evaporation rates can lead to declines in water level and water availability during droughts, making monitoring essential.\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.fondriest.com\/news\/from-pans-to-buoys-advancing-reservoir-evaporation-rate-monitoring-in-texas.htm\" \/>\n<meta property=\"og:site_name\" content=\"Environmental Monitor\" \/>\n<meta property=\"article:published_time\" content=\"2025-02-19T12:00:21+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-10-06T20:49:54+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/news.fondriest.com\/wp-content\/uploads\/2025\/02\/Choke_Canyon_buoy_deployment-1_ForWeb.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"940\" \/>\n\t<meta property=\"og:image:height\" content=\"705\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Samantha Baxter\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Samantha Baxter\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/from-pans-to-buoys-advancing-reservoir-evaporation-rate-monitoring-in-texas.htm#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/from-pans-to-buoys-advancing-reservoir-evaporation-rate-monitoring-in-texas.htm\"},\"author\":{\"name\":\"Samantha Baxter\",\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/#\\\/schema\\\/person\\\/341002b379397e09112d3edcefc25a50\"},\"headline\":\"From Pans to Buoys: Advancing Reservoir Evaporation Rate Monitoring in Texas\",\"datePublished\":\"2025-02-19T12:00:21+00:00\",\"dateModified\":\"2025-10-06T20:49:54+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/from-pans-to-buoys-advancing-reservoir-evaporation-rate-monitoring-in-texas.htm\"},\"wordCount\":1084,\"commentCount\":0,\"image\":{\"@id\":\"https:\\\/\\\/www.fondriest.com\\\/news\\\/from-pans-to-buoys-advancing-reservoir-evaporation-rate-monitoring-in-texas.htm#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/news.fondriest.com\\\/wp-content\\\/uploads\\\/2025\\\/02\\\/Choke_Canyon_buoy_deployment-1_ForWeb.jpg\",\"keywords\":[\"buoy\",\"buoy monitoring\",\"buoy system\",\"climate monitoring\",\"data buoy\",\"Desert Research Institute\",\"evaporation data\",\"monitoring buoy\",\"temperature\",\"Texas Water Development Board\",\"U.S. Bureau of Reclamation\",\"weather data\"],\"articleSection\":[\"Buoy\",\"Data Buoy\",\"Earth &amp; 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Baxter is a Writer and the Managing Editor for Fondriest Environmental. She received B.A. degrees in Integrated Language Arts Education and Political Science at Wright State University. She was hired as an intern in the spring of 2022 and has continued to work as a writer and editor for the Environmental Monitor, FishSens Magazine and other Fondriest Environmental pages. As a writer, Samantha works with researchers from across the country to craft stories that highlight their work and its impacts. As an editor, Samantha works with graphic designers, fellow writers, and various environmental professionals to create unique content for Fondriest Environmental. 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Baxter is a Writer and the Managing Editor for Fondriest Environmental. She received B.A. degrees in Integrated Language Arts Education and Political Science at Wright State University. She was hired as an intern in the spring of 2022 and has continued to work as a writer and editor for the Environmental Monitor, FishSens Magazine and other Fondriest Environmental pages. As a writer, Samantha works with researchers from across the country to craft stories that highlight their work and its impacts. As an editor, Samantha works with graphic designers, fellow writers, and various environmental professionals to create unique content for Fondriest Environmental. 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