0.02 inches.
Pinch your fingers together and try to imagine 0.02 inches.
That’s how much rain fell at San Diego International Airport in April. 30 days in San Diego and the airport measured 0.02 inches of rainfall.
In the coming weeks, the City of San Diego will begin emergency repairs on the Lake Hodges Dam at the Hodges Reservoir in Escondido outside of Rancho Santa Fe.
During a recent inspection, the city identified areas in the dam wall that require repair and need be sealed. In order to complete the work, the water level of the reservoir needs to be lowered by about 18 feet from its current level to an elevation of 275 feet.
The repair project is expected to continue for an estimated five months.
The San Diego County Water Authority has been granted its first ever utility patent for a device that inspects interior sections of water pipelines that are inaccessible or not safe to inspect without expensive specialized gear and training.
Water Authority Operations and Maintenance Manager Martin Coghill invented the tool to save time, reduce costs and improve safety during ongoing aqueduct inspections. The Water Authority’s industry-leading Asset Management Program includes a proactive search for pipeline weaknesses that can be addressed before they become large and costly problems.
The U.S. Patent and Trademark Office awarded Patent #US011,293,581 on April 5, 2022, for the Water Authority’s pipeline inspection system, which comprises a body, cameras, support members and light sources to capture high-resolution images of pipeline walls.
“This new pipeline inspection tool is a prime example of the Water Authority’s commitment to innovation that benefits ratepayers by saving money and enhancing reliability,” said Water Authority General Manager Sandra L. Kerl. “We have a long history of advancing industry-leading solutions, from state legislation to adopt low-flow toilets in the early 1990s to the nation’s largest water conservation-and-transfer program a decade later to the largest seawater desalination plant on the continent.”
The Water Authority operates and maintains a water delivery system capable of delivering more than 900 million gallons of water per day through 310 miles of large-diameter pipeline, 1,600 aqueduct-related structures, and approximately 100 metering/flow control facilities. It also includes a state-of-the-art water treatment plant, hydroelectric facilities, pump stations, flow regulatory structures, and reservoirs that store water for emergencies and dry years.
The Water Authority uses a combination of technologies for monitoring pipelines, including electromagnetic scanning, which detects and locates damaged areas within pipeline walls, and real-time acoustic fiber-optic monitoring, which can detect and locate distressed pipelines while they are in service. The technology invented by Coghill is just a small part of an expansive toolkit.
The Water Authority applied for the patent on June 13, 2019, and spent nearly three years completing the complex process. The patent assigns the intellectual property rights to the Water Authority, allowing it to freely use the technology and share it with other water utilities that might also benefit from its use.
The inspection tool uses commercially available lightweight adventure cameras and lights that are arranged in a unique way on a chassis that moves through pipelines that are 4 to 9 feet in diameter, said Coghill, who has worked for the agency since 2013.
The inspection tool uses commercially available lightweight adventure cameras and lights that are arranged in a unique way on a chassis that moves through pipelines that are 4 to 9 feet in diameter. Photo: San Diego County Water Authority
“This technology was created in-house out of necessity to improve safety while inspecting steep portions of our aqueduct,” said Coghill. “The array of multiple cameras enables high-resolution imaging, and the unique design keeps the cameras oriented in the correct position relative to the pipe.”
Coghill, who affectionately calls the tool “Scanny,” said the camera array can also be added to any existing pipeline assessment equipment and offers much higher resolution than traditional CCTV. In addition to inspecting unsafe and inaccessible portions of pipelines, the tool’s design means the Water Authority no longer needs to use specialized third-party rope support crews to assist with pipe inspections. A bonus feature of the device is the ability to stitch the video files together for an immersive 360-degree virtual reality experience. He said it’s always fun to take people into the pipe by just putting on VR goggles.
The Water Authority will continue to use its patented technology to benefit water ratepayers and the safety of employees.
The complete patent is posted on the U.S Patent and Trademark Office website: https://bit.ly/3vGEk0I.
Construction of the new Flow Regulatory Structure II, or FRS II, in Mission Trails Regional Park is nearing completion. The structure is now completely enclosed on all sides and was successfully tested.
Construction crews have started placing soil around the exterior walls to begin burying the structure. In the next three weeks, the roof will be covered so the facility is concealed. Water is expected to begin flowing into FRS II in June 2022.
The new structure, located in the northwest portion of Mission Trails Regional Park, is part of a San Diego County Water Authority project to upgrade the untreated water system that delivers water to treatment plants servicing the central and southern areas of the county, helping to balance the flow of untreated water. Once in operation, the FRS II will be capable of holding nearly five million gallons of water – enough water to fill seven Olympic-sized swimming pools.
Revegetation efforts will begin after FRS II is work is complete this fall. The topsoil was removed and stored onsite and will be returned help restore native plants and vegetation to pre-construction conditions.
Before the project began, 225 pounds of live seed was gathered from within Mission Trails Regional Park and taken to a dedicated nursery. From these seeds, more than 22,000 native plants are being grown and will be planted over a 17-acre area. Once planted, there will be a 120-day plant establishment period followed by five years of maintenance and monitoring to assure successful implementation.
Construction began in March 2020 just as the coronavirus pandemic began. As an essential infrastructure project, construction on the water project continued during the pandemic.
The Water Authority operates and maintains a regional water delivery system capable of delivering 900 million gallons of water per day.
Watch a recent news story about the project nearing completion.
As part of continuing efforts to maintain and invest in City of San Diego infrastructure, repair work starts within the next two weeks on Hodges Dam, at the Hodges Reservoir north of Rancho Bernardo.
“It’s been over a century since Hodges Dam was constructed, and we are making significant investments to maintain this vital asset,” said Alia Khouri, Deputy Chief Operating Officer.
As part of continuing efforts to maintain and invest in City of San Diego infrastructure, repair work starts within the next two weeks on Hodges Dam, at the Hodges Reservoir north of Rancho Bernardo.
“It’s been over a century since Hodges Dam was constructed, and we are making significant investments to maintain this vital asset,” said Alia Khouri, Deputy Chief Operating Officer. “Projects like this one are crucial for the City’s aging infrastructure system in order to maintain the safe and efficient delivery of City services.”
During a recent inspection, staff identified areas in the dam wall that require repair and need to be sealed. To access these areas, the water level of the reservoir needs to be lowered by approximately 18 feet from its current level to an elevation of 275 feet. The reservoir may need to be lowered below 275 feet if additional areas needing repair are identified during the project. The repair project is expected to continue for an estimated five months.
The Hodges Dam, shown here in 1929, was built in 1918. Photo: UC San Diego
The primary function of Hodges Reservoir is to store water for potable use. The City is working with its regional water agency partners on a plan to draw down the reservoir level to maximize water savings. Most, if not all, of the water will be transferred to other reservoirs, while some water may be released into the San Dieguito River.
“The City of San Diego is committed to maintaining Hodges Dam to ensure the protection of our water resources and public enjoyment of the reservoir,” said Juan Guerreiro, Interim Director of the City’s Public Utilities Department. “We appreciate the public’s patience while we complete the project.”
To access areas of the Hodges Dam for repairs, the water level of the reservoir needs to be lowered by approximately 18 feet from its current level to an elevation of 275 feet. As a result of the lower water level, the Hodges Reservoir will be closed for recreation while the repair project is underway. Boating and fishing will still be available at other City of San Diego reservoirs. The San Dieguito River Park trails and facilities around Hodges Reservoir will not be impacted during the drawdown or dam construction work.
Operated and maintained by the San Diego Public Utilities Department, the reservoir currently serves the San Diego County Water Authority, San Dieguito Water District, and Santa Fe Irrigation District, and the City of San Diego. San Diego operates nine reservoirs, including Hodges.
(Editor’s note: The City of San Diego, San Dieguito Water District, and the Santa Fe Irrigation District are three of the San Diego County Water Authority’s 24 member agencies that deliver water across the metropolitan San Diego region.)
Because of the megadrought that’s gripping the southwestern United States, the federal government is cutting back how much water it delivers to California, Arizona and Nevada by a lot, about as much as Las Vegas uses in a year. It’s something water managers never thought they’d have to do. Alex Hager reports on the Colorado River from member station KUNC in Greeley, Colo., and joins us now to explain what’s going on. So decades ago, the U.S. built huge dams on the Colorado River specifically to store water as insurance against droughts. Why isn’t that system working now?
Lake Mead’s “bathtub ring” is set to become even more pronounced this year.
The lingering drought is the overriding reason that the lake’s water level will fall again in 2022, but it’s also because less water will be released upstream on the Colorado River from Lake Powell.
This month, the seven Colorado River Basin States — Arizona, California, Colorado, Nevada, New Mexico, Utah and Wyoming — agreed with federal officials’ recommendations to institute a 480,000 acre-foot reduction from Glen Canyon Dam on Lake Powell to reduce the risk of the lake declining below 3,490 feet.
The Olivenhain Municipal Water District recently completed the Manchester Avenue Potable Water Pipeline Project. In total, 3,700 linear feet of aged potable water pipeline was replaced along Manchester Avenue, Rancho Santa Fe Road and Encinitas Boulevard.
The pipelines previously serving water in this area were installed in 1961 and were approaching the end of their lifespan.
The Olivenhain Municipal Water District recently completed the Manchester Avenue Potable Water Pipeline Project. In total, 3,700 linear feet of aged potable water pipeline was replaced along Manchester Avenue, Rancho Santa Fe Road and Encinitas Boulevard.
The pipelines previously serving water in this area were installed in 1961 and were approaching the end of their lifespan. OMWD takes a proactive approach in repairing and replacing aging water infrastructure to avoid leaks and ensure the continuation of uninterrupted water service to its customers. In the third year of drought in California, projects like this pipeline replacement, help save potable water and reduces costs to ratepayers.
“Emergency leaks are very costly, can waste millions of gallons of water, and can be disruptive to surrounding communities,” said Bob Topolovac, OMWD board director. “The investments we made to prevent these emergencies will benefit our ratepayers well into the future.”
Crews complete the final backfilling and repaving of the excavation area on Manchester Avenue required to facilitate the new pipeline installation. Photo: Olivenhain Municipal Water District
The project completion map shows streets now fully opened to traffic and restored. Graphic: Olivenhain Municipal Water District
To minimize the impact on the surrounding community, construction took place mainly at night. The project was completed on time and with no major disruptions or water outages to the impacted community. OMWD coordinated with the City of Encinitas on a traffic management plan to mitigate construction traffic, and there were no significant traffic impacts.
(Editor’s note: The Olivenhain Municipal Water District is one of the San Diego County Water Authority’s 24 member agencies that deliver water across the metropolitan San Diego region.)
