I'm grateful that these flood control projects are near completion. Checking the FEMA maps, my home's flood risk has already dropped to the 500-year-flood category, thanks to these improvements.
I have been following these projects since the earliest public presentations of flood-control options by (what is now) Valley Water. At one of these public sessions a man from Los Altos actually proposed that instead of spending money to mitigate flood risk, the homes at greatest risk (i.e., Shoreline West) should be torn down! Of course the flood risk would have been mitigated decades ago if the orchards of Los Altos had remained as they were, instead of being paved and built over with thousands of homes.

@ SP Phil - I'm glad your FEMA flood risk was reduced, from 100 year to 500 year. That said, I question the need for the McKelvey Park Basin, and the huge expense. Hale Creek has a watershed of only 5 square miles (Web Link and Permanente Creek has a watershed of 17.5 square miles (Web Link However, Permanente Creek has a diversion canal, which sends most of its water to Stevens Creek. Ever since the creation of this diversion canal, in 1959, there has been no flooding along lower Permanente Creek. As a matter of fact, while constructing the McKelvey Park Basin, the water in lower Permanente Creek has been mainly from city streets below the diversion canal, and that has been only a trickle, meaning that the diversion canal has eliminated nearly all the flow from the watershed.

I think the previous comment includes false information.
When there is significant rain, Permanente Creek is fast flowing, and this is not just water from the neighborhood. You can experience this yourself by looking where it goes under the bridge in park drive in mountain view. During an atmospheric river event it's impressive there.
It's also false that it never flooded - it did last time in the 90s. You can look this up yourself.
It's difficult to understand why people argue so strongly against the flood protection efforts, and why do that with false information? Do they have a beef with whoever is implementing them?