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NOAA and USGS describe real‑time flow tool that mimics natural hydrographs on Trinity River
Summary
NOAA Fisheries fish biologist Seth Naiman and coauthor Nick Som (USGS) presented a "real‑time flow management" tool that synchronizes dam releases with tributary forecasts to mimic natural winter–spring variability on the Trinity River while keeping the same annual water budget.
Seth Naiman, a fish biologist with NOAA Fisheries, and co‑author Nick Som of the USGS cooperative unit described a real‑time flow management (RTM) tool developed for the Trinity River division of the Central Valley Project to restore more natural flow variability while keeping annual water budgets unchanged.
Naiman said the Trinity River basin has been strongly altered since Trinity Dam began regulating flow in 1961. He described the dam’s storage (about 2,400,000 acre‑feet) and average annual inflow (about 1,200,000 acre‑feet), and explained that large storage relative to yield largely decoupled downstream hydrographs from historical patterns. He described ecological consequences such as suppressed juvenile salmon growth, sediment accumulation at…
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