Washington Post: Devastating Middle Tennessee floods latest consequence of climate change

Training thunderstorms dumped 17 inches of rain within 24 hours last week in Middle Tennessee, causing a cascade of runoff that led to localized flash flooding of creeks and rivers that killed at least 20 people and destroyed the small town of Waverly. That amount of rain, which a climatologist said had a 1 in 1,000 chance of occurring, would set a record for the highest amount of daily rainfall recorded in the entire state.

A lesser-noted flood of the Pigeon River just over the state line in Haywood County, North Carolina a week ago killed at least five people and destroyed homes and property as the remnants of Tropical Storm Fred moved over the region. The towns of Canton and Clyde were particularly hard hit. A rain gauge in Cruso recorded nearly 15 inches of rain in less than three days, according to the Smoky Mountain News. Nine inches fell within a 24-hour period.

Deadly floods in Germany and the European lowcountry this summer that killed 200 people were also attributed to climate change.

A warmer atmosphere holds exponentially more moisture, so such intense rainstorms will increase in coming years as climate change reshapes the Earth, scientists told the Washington Post.

"It’s yet another example of how climate change has loaded the dice for disaster, experts say. The floods that people lived through in the past are no match for the events that are happening today. And what in 2021 seems like an unprecedented catastrophe may by 2050 become an annual occurrence," the Post reported.

The flooding threat promised by a warming planet is exacerbated by continuing urbanization and inadequate public stormwater infrastructure. More impermeable surfaces means more runoff.

The Tennessee Theatre announced Monday it will require proof of inoculation against Covid-19 or a recent negative test for the virus before entry into the historic, storied theater on Gay Street in Knoxville. The theater will also require that all audience members be masked. The new rules are effective immediately.

The theater said in an email that increasing rates of infection in the Knoxville area and elsewhere in the country — predominantly in the Southeast — prompted the public-safety decision.

”Because of this, the Tennessee Theatre is enacting some new (Covid) protocols to allow us to continue presenting events while doing our best to keep our audiences safer and healthier.“ The rules will be in place at least through Halloween, according to the theater.

”While we take these necessary steps to remain open and serving the community while providing a safer environment for all, we ask for patience and understanding as we continue to navigate a challenging period in the Tennessee Theatre’s 93-year history.”

The negative test must have been administered within the preceding 72 hours.

Some upcoming shows and events at the Tennessee Theatre into October include this week’s screening of the Goonies; three Knoxville Symphony Orchestra Masterworks Series performances; the Righteous Brothers; and an Alton Brown appearance.

WATE: Commercial fishing pulls out 10 million pounds of exotic carp from Tennessee River system

If you never thought there’d be an Asian carp commercial fishery in Tennessee waters, you were wrong.

Tennessee Wildlife Resources Agency’s Asian Carp Harvest Incentive Program has yielded 10 million pounds of the exotic fish since 2018, the bulk caught downstream on the Tennessee River system at Kentucky and Barkly reservoirs. The fish has been spotted as far upstream as Knox and Anderson counties.

The Tennessee Valley Authority and TWRA are experimenting with acoustic barriers to prevent further upstream spread of the fish, which compete with native fish for food and habitat.

“There are four types of Asian carp: bighead, silver, black and grass,” WATE reported. “Experts say the species threatens to disrupt aquatic ecosystems and starve out native species due to their ability to out-compete native species for food like plankton.”

So what do fishermen do with 10 million pounds of carp?

It can be sold to wholesalers for distribution abroad and also makes for really good fertilizer.

NYT: Arizona farmers first affected but more cuts likely in future

The Bureau of Reclamation declared a water shortage Monday in Lake Mead, a huge reservoir below Hoover Dam that lies along the Colorado River, a historical, natural and national landmark and economic engine that ultimately provides water to seven Western states.

It was the first such dire Level 1 declaration since construction of the reservoir, the largest in the Colorado River impoundment system, in the 1930s. The surface of Lake Mead is projected to soon reach about 1,000 feet above sea level; it's only at about 35 percent capacity, the New York Times reported. Lake Powell in Utah is also at historically low levels.

In an example of drought affecting areas beyond the Colorado basin, a California reservoir, Lake Oroville, near the site of the huge and destructive Dixie Fire, recently dropped below levels suitable for pumping water.

Arizona stands to lose 20 percent of its allotment of river water because of the federal restrictions. Many farmers and others have said they will have to drill for groundwater, itself a resource of concern.

The river provides water to 40 million people in seven states across the West from Wyoming to Mexico, which has a say in how the water is distributed before it reaches the border. Increasingly low-level flows are due to reduced runoff from sparse rainfall and snow packs reduced by worsening drought linked to climate change.

An Audubon Society representative on the board that governs the distribution of the river water foresees more cuts, some of which are predicated on protections of natural habitat and wildlife. “Once we’re on that train, it’s not clear where it stops," she told the Times.

The Revelator: Residual drugs largely unfiltered by existing wastewater plants

Aquatic species around the world are exposed to at least 600 types of residual drugs, ranging from anti-inflammatories to antidepressants, and it’s not fully understood how these chemicals will ultimately affect marine ecosystems.

Some research indicates that a species of crayfish is emboldened by antidepressant compounds in the presence of predators, lessening its flight response. Scientists have also noted the presence of pharmaceuticals among invertebrates, as well as seaweed.

More work is needed to further document the effects of the chemicals on the behavior and reproduction of aquatic life, but people can temper the introduction of pharmaceuticals in the first place by never flushing medications down the toilet or any other drain, and checking in on the filter technologies in place at their local wastewater treatment plant. Some advanced carbon filters can successfully remove pharmaceuticals from wastewater before it’s released into the environment.