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The part about rain volume, has more to do with good current flow, and optimal spanwing (egg-laying) conditions and stability in the river during the spawming period, and less to do with run-off (pollution).
If you think about it more rain would also dilute fertilizer and chemical run off and push more volume further in the bay, etc. A small amount of rain (snow melt) would give much more concentrated "polluted" water, slower flow, which in turn causes increased plant (algea) growth come spring and more sun. That causes more problems as previously stated.
It is a complex web of interconnected variables.
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