Main Canal Reservoir
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fall 2020 The Irrigator Modesto Irrigation District Water Operations Newsletter inside this issue main canal reservoir main canal reservoir MID’s primary focus for the 2019 winter work season was to complete the Main Canal MCR Project Overview Reservoir Project (MCR Project). The vision for the MCR Project Purpose MCR Project began after purchasing 60 acres of land in March 2011. Following a rigorous system Water Supply analysis, the MCR Project was formally Rainfall recommended by MID’s Water Advisory Committee in 2013 in an ongoing effort to modernize MID’s Snowpack gravity flow delivery system. Modernizing MID’s Don Pedro Reservoir Storage delivery system is an important step to improve water delivery reliability in drought years and allow irrigation field services for strategic beneficial use of water. Online Water Ordering Debris Removal The design was conceptualized over the next few years along with a host of other projects as part of Fleabane the District’s Comprehensive Water Resources Ditchtender Cell Phone Numbers Management Plan (CWRMP). A design was completed early last year and construction on the regulatory processes MCR Project began in July 2019 and was completed Voluntary Agreement & Relicensing in March 2020. Until the Last Drop Documentary MID Water Operations division Monday - Friday | 7 a.m. - 4 p.m. 209.526.7639 mCR Project overview MID’s MCR Project included development of a new, nearly 300 acre-foot (AF) regulating reservoir located at MID’s Main Canal and Lateral 3. In addition to the reservoir, project construction was comprised of four water control structures, two flow measurement flumes downstream of the project site, a new Supervisory Control and Data Acquisition (SCADA) system and system integration. The MCR Project was designed to regulate water flows to better match downstream demands for both the Main Canal and Lateral 3. Through implementation, MID’s operational flexibility is increased by allowing short-term changes on either canal to occur without requiring changes in the upper reaches of MID’s delivery system. This allows for faster responses to imbalances in the irrigation supplies and customer water demands downstream of the Lateral 3 and the Main Canal bifurcation – which accounts for nearly three-quarters of MID’s irrigated acreage. Flow rates and water levels are automatically monitored and controlled and communication enhancements allow MID to account for flow fluctuations and make corresponding adjustments remotely in real-time. mCR Project purpose As part of MID’s CWRMP, a series of strategically located regulating reservoirs were identified as an integral component of efficient water management. The MCR Project serves as the largest of the proposed reservoirs and the first fully designed, permitted and constructed. Re-regulation of the flows allows flow fluctuations to be captured and the system’s operations to be harmoniously managed. Water conserved remains stored in Don Pedro Reservoir for future use – which benefits all MID customers – and becomes especially critical during dry and sequentially dry years. In addition to better managing flow fluctuations, the MCR Project provides a means of accounting for inflows from Oakdale Irrigation District (OID) drains. MID receives drain water from neighboring OID at several locations along the MID Lower Main Canal. These flows were previously unregulated and unmeasured making it nearly impossible to rely upon for meeting downstream demands. The MCR Project provides a means of putting these flows to beneficial use. Also, the reservoir bottom is unlined providing additional positive contributions to the overall health of groundwater resources within the Modesto Subbasin. While the primary use of the MCR Project is during the irrigation season, the nearly 60-acre footprint is likely to play an equally important role in groundwater recharge during the winter months through implementation of the Modesto Subbasin’s Groundwater Sustainability Plan. The regulating reservoir is a proven concept for balancing large delivery flows and it demonstrates MID’s unwavering commitment to innovation in water management. Water Supply rainfall The 2019/2020 water year was another year of extremes. After seeing record rainfall in the Tuolumne watershed in 2017 and 2018, we experienced just the opposite for the fall of 2019 and the start of 2020. From the beginning of October until Thanksgiving 2019, the watershed and the city of Modesto didn’t see a drop of rain. In December, the rainfall levels picked up to near normal, but slowed down again in January, which is typically one of the wettest months. February 2020 then made history as the driest February on record with both the Tuolumne River Basin and the city of Modesto recording zero rainfall. While we unfortunately didn’t have a “Miracle March,” we had some storms in the middle of March, which continued through April and tapered off again in May. The city of Modesto ended the water year slightly above 6.5 inches, while the Tuolumne watershed received only 22.4 inches, well below the normal rainfall totals of 12 inches and 35 inches, respectively. snowpack The Sierra snowpack didn’t fare much better and followed a similar pattern as the rainfall. A series of storms dropped several feet of snow in the Tuolumne watershed with an estimate of 500 total acre feet of snow water equivalent in December and January. Fortunately, unusually cold temperatures in the basin kept much of the snow from melting, which proved to be a critical factor in preserving the snowpack during the dry February. The basin did see snowfall return in March and April, which provided enough runoff to fill Don Pedro and the upstream reservoirs. However, due to the lack of snowpack and runoff throughout the San Joaquin River Basin as a whole, the Department of Water Resources has classified San Joaquin Water Year Index for 2020 as “Dry.” don pedro reservoir storage Reservoir storage provided the bright spot to this year’s water supply. Banking off two wet years in 2017 and 2018, as well as skillfully-managed reservoir operations, Don Pedro Reservoir storage remained in good shape as we began the 2020 irrigation season. When the 2019 irrigation season ended, Don Pedro storage was slightly above elevation 794 feet with over 1.6 million acre-feet of water stored. Even with the lack of rain and snowmelt runoff this winter, Don Pedro was able to reach an 809 feet elevation (1.77 million acre-feet) peak on June 1, 2020. This allowed MID and Turlock Irrigation District to provide a full allocation to growers and remain confident that enough carryover supply will be available if we have another dry winter. irrigation field services online water ordering At the start of the 2020 irrigation season, Irrigation Field Services launched an online water ordering pilot program. This is an effort to gauge the validity of moving from a call-based system of ordering water to an online water ordering system. If you participated in the pilot this irrigation season, we’d like to hear your experience and feedback. Your participation and feedback are essential to the success of this program. If you’re interested in signing up for the online water order pilot program or would like to provide feedback, please contact the Irrigation Field Services office at (209) 526-7639 or [email protected]. debris removal MID picks up debris from specific locations on our canals every week on Tuesdays and Thursdays. The ditchtenders clean the canal grates every night to keep debris from restricting water flow, which results in piles of debris. Many times, these debris piles can be seen in areas where the canal goes under the road. MID is committed to managing the unsightly accumulation of trash and debris along our facilities. To report debris that needs to be picked up, please contact the Irrigation Field Services office at (209) 529-7639 or [email protected]. fleabane The invasive plant known as fleabane is a common nuisance weed for many irrigation districts and their growers. While fleabane is unfortunately Roundup resistant, MID actively works to treat fleabane in two ways – (1) through the application of Gallery and Dimension before emergence and (2) through the application of Capstone following emergence. It isn’t uncommon to have a “breakthrough” of fleabane following either or both of these treatment methods. When and if a breakthrough happens, we consult with our Pest Control Advisors from Target and Dow Chemical in an effort to optimize our herbicide applications and ensure that we effectively kill the fleabane. Regardless of a fleabane breakthrough, MID meets with our chemical supplier annually to ensure that we stay informed of the leading means and methods for effective herbicide applications. While MID considers our weed management practices among the best in the industry, there are many factors that ultimately play into our overall effectiveness, such as precipitation and chemical resistance. We are continuing to learn and evolve while actively and aggressively treating fleabane within the limits of MID’s rights-of-way. ditchtender cell phone numbers All MID Ditchtenders have two phone numbers – a District land line number that forwards to a cell phone and their cell phone number. In an effort to improve our service and make sure the Ditchtenders receive all incoming calls, here is a list of all of their cell phone numbers. area 1 - mark pieczarka & Chuck birdsong area 6 - Randy Terra & tony esquivel (209) 652-7326 (209) 652-1268 area 2 -john van oostende & sergio chavez area 7 - larry mendoza & levi heinrich (209) 652-7082 (209) 652-9813 area 3 - fred albertoni & johel arrequin west side night tenders - matt dickens & bailey terra (209) 652-7114 (209) 652-6198 area 4 - terry lee & jorge camarena east side night tenders - jett hoag & kyle bizzini (209) 652-7077 (209) 652-7124 area 5 - thomas helms & alex anderson (209) 652-7118 regulatory processes voluntary agreement & don pedro relicensing Almost four years ago, our communities rallied and pleaded for a change in how the state approached updating its Bay-Delta Water Quality Control Plan which demanded between 30% and 50% unimpaired flow from the Tuolumne River for the alleged benefit of fish.