Excessive heat is straining all kinds of critical infrastructure Excessive heat is straining all sorts of Bay Area infrastructure With temperatures soaring, millions of gallons of water are evaporating everyday from each of the various water reservoirs that supply Bay Area residents with water. The hot temperatures are also straining electrical utilities, along with roadways, and railways. KTVU's Tom Vacar reports. OAKLAND, Calif - In the era of global warming and climate change, prolonged or repetitive heat spells take a toll on our aging infrastructure in way most of us don't think about. Extreme heat is becoming an increasing issue as it relates to old infrastructure and how to build the new.