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ID: 2629
[1.03 MB] Buxton (2024) WY2023 Water and Temperature Report.pdf
Buxton, T. H. 2024. Trinity River water allocation, temperatures, and model results for implemented flows and proposed hydrographs for water year 2023. Report TRRP-2024-1 for the Trinity River Restoration Program (TRRP). U.S. Bureau of Reclamation, TRRP, Weaverville, California. Available: https://www.trrp.net/library/document?id=2629.
Water year (WY) 2023 was designated “Wet” based on the April 1st B120 report that projected full natural flow (FNF) at Lewiston would be 1,620,000 acre feet (AF). This projection was 3.1% higher than the observed FNF of 1,570,413 AF. The Wet WY projection enabled 701,000 AF of water to be released from Lewiston Dam to the Trinity River for river restoration. The actual volume released for restoration (692,573 AF) was 1.2% lower than the allocated volume and within the assumed error range of the flow gage at Lewiston (±10%), indicating the allocated and released water volumes were functionally equivalent. In addition to restoration flows, 10,804 AF was released for the Hoopa Boat Dance ceremony. The volume of water exported from the Trinity River basin to the Central Valley was 156,934 AF, which is the lowest diversion volume since 2001. The volume of water stored in Trinity Reservoir increased from 552,111 AF at the start of the water year (10/1/2022) to 1,274,952 AF at the end of the water year (9/30/2023). This increase raised the water surface in the reservoir 89.5 ft. Water temperatures recommended at Lewiston for aiding salmonid spawning and egg incubation exceeded the targeted values for 21 days and were below the targets for 140 days of the 166-day target period. Water temperatures at Douglas City and above the North Fork Trinity River (TRNF) met their compliance values for 60% and 83% of their respective periods. Recommended water temperatures at TRNF for aiding juvenile salmonid rearing were met for 27 days of the 120-day target period in WY 2023.
First Posted: 2024-01-18 00:34:34
Post Updated: 2024-01-18 00:34:34