Map of drying reservoirs in the west

To show water levels in California’s drying reservoirs, The Washington Post used upside down triangles to represent each reservoir.

I like the idea to use an encoding that kind of looks like a reservoir, but my brain can’t help but read the fill level through height instead of area. Maybe the tradeoff isn’t worth it in this case? Compare this against a circle representation from 2015.

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Map shows you where a raindrop ends up

River Runner is a fun interactive map by Sam Learner. Click anywhere in the contiguous United States to drop some rain and, based on data from the U.S. Geological Survey, the map shows you where the rain ends up and the path it takes to get there.

This uses USGS NHDPlus data and their NLDI API to visualize the path of a rain droplet from any point in the contiguous United States to its end point (usually the ocean, sometimes the Great Lakes, Canada/Mexico, or another inland water feature). It’ll find the closest river/stream flowline coordinate to a click/search and then animate along that flowline’s downstream path.

When you think about it, it’s kind of nutty that something like this is even possible. [via Waxy]

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New Lab Matters: The ABCs of PFAS

New Lab Matters: The ABCs of PFAS |

First discovered in the 1930s, per- and polyfluoroalkyl substances (PFAS) now pervade almost every aspect of modern life. In fact, PFAS compounds are found in everything from dental floss to cookware. But human exposure to PFAS comes at a cost, and as old compounds are removed from production, new compounds take their place. So how does a public health laboratory handle this challenge with limited resources? As our feature article shows, by establishing new public-private partnerships.

Here are just a few of this issue’s highlights:

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The post New Lab Matters: The ABCs of PFAS appeared first on APHL Lab Blog.

Light installation shows future water lines against existing structures

Timo Aho and Pekka Niittyvirta used sensors, LED lights, and timers to display future water lines:

By use of sensors, the installation interacts with the rising tidal changes; activating on high tide. The work provides a visual reference of future sea level rise.

The installation explores the catastrophic impact of our relationship with nature and its long term effects. The work provokes a dialogue on how the rising sea levels will affect coastal areas, its inhabitants and land usage in the future.

Love that a single line of light can represent so much.

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New Lab Matters: Time to welcome the next generation of public health laboratory scientists

New Lab Matters: Time to welcome the next generation of public health laboratory scientists |

The Bureau of Labor Statistics estimates that 12,000 new laboratory professionals are needed each year to meet consumer demand. At the same time, while automation has eliminated some less-skilled laboratory jobs, the growing sophistication of public health laboratory analyses has generated demand for scientists with highly specialized training. As our feature article shows, laboratories are recruiting new talent for the “hidden profession” by taking a hard look into what they really want, and how they want to work.

Here are just a few of this issue’s highlights:

Subscribe and get Lab Matters delivered to your inbox, or read Lab Matters on your mobile device.

The post New Lab Matters: Time to welcome the next generation of public health laboratory scientists appeared first on APHL Lab Blog.

Watch rising river levels after Hurricane Florence

Hurricane Florence brought a lot of rain, which in turn made river levels rise. The New York Times animated the rise over a five-day period. The height of the bars represents the rise of the river level, as compared to levels on Thursday.

I like the visual metaphor of bars going up with river levels. I’m not sure the sudden rise and falls in such short periods of time would appear as surprising.

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Turning water pollution into audiolized awareness

Brian House collected polluted water with acid mine drainage in the Tshimologong Precinct, Johannesburg and translated pollution levels to sound:

Acid Love comprises vessels of AMD gathered from a mine on the outskirts of the city. These are connected in an electrical circuit that measures the conductivity from the metals of the water and coverts it into sound. The sound is further modulated by data gathered from remediation efforts at the mine. The installation itself also performs a remediation process—over time the metals will precipitate to the bottom of the vessels, and both the sound and the color of the water will change as it is purified.

[via @blprnt]

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A transforming river seen from above

The Padma River in Bangladesh is constantly shifting its 75-mile path. Joshua Stevens for the NASA Earth Observatory shows what the shifting looked like through satellite imagery, over a 30-year span.

Kasha Patel:

The upper section of the Padma—the Harirampur region— has experienced the most erosion and shows the most notable changes. The river has become wider at this section by eroding along both banks, although most activity occurred on the left bank. Using topographic, aerial, and satellite imagery, scientists found that the left bank shifted 12 kilometers towards the north from 1860 to 2009 and developed a meandering bend. The river left a scar where the water once flowed, as you can see in the 2018 image.

See also the dramatic shifts of the Ucayali River in Peru.

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Why Diarrhea & Swimming Don’t Mix


Kids by PoolThe summer swim season is here, and millions of Americans will be flocking to local pools for fun in the sun and exercise. However, swimming, like any form of exercise, does not come without health risks. The good news is that we can all take a few simple but effective steps to help keep ourselves and other swimmers we know healthy and safe.

While sunburn and drowning might be the health risks that first come to mind when you think about swimming, diarrhea is another culprit. Outbreaks of diarrheal illness linked to swimming are on the rise. And this Healthy and Safe Swimming Week, we want to make sure you know these important facts about diarrhea-causing germs at aquatic venues, like swimming pools and water playgrounds, and how to protect yourself and loved ones.

  1. When swimmers have diarrheal incidents in the water, they release diarrhea-causing germs into the water. For example, a swimmer infected with the parasite Cryptosporidium can release 10–100 million infectious germs into the water. Swallowing 10 or fewer Cryptosporidium germs can make someone sick.
  2. Don't leave your mark at the pool this summerSome diarrhea-causing germs can survive in properly treated water for days. Standard levels of chlorine and other disinfectants can kill most germs in swimming pools within minutes. However, Cryptosporidium has a tough outer shell and can survive for up to 10 days in properly treated water. Outbreaks of diarrhea linked to pools or water playgrounds and caused by the parasite Cryptosporidium have doubled since 2014.
  3. Swim diapers won’t keep diarrhea out of a pool. Using swim diapers might give parents a false sense of security when it comes to containing diarrhea. Research has shown that swim diapers might hold in some solid feces but these diapers only delay diarrhea-causing germs, like Cryptosporidium, from leaking into the water by a few minutes. Swim diapers do not keep these germs from contaminating the water.
  4. Don’t swallow the water you swim in. Swallowing just a small amount of water with diarrhea germs in it can make you sick for up to 3 weeks.
  5. Don’t swim or let your kids swim if sick with diarrhea. We all share the water we swim in. Do your part to help keep loved ones healthy by not getting in the water if you or your children have diarrhea.

CDC’s Michele Hlavsa is a nurse and the chief of CDC’s Healthy Swimming Program. As a parent, it is important for her to know how to protect her children from not only diarrhea, but all types of germs and injuries linked to swimming. Michele encourages swimmers to follow a few easy and effective steps each time they swim in a pool or get in a water playground this summer and year-round.


After Matthew: The Hidden Dangers of Hurricanes

Fallen trees and damaged electrical power lines blocking a road; hazards after a natural disaster wind storm

The thrashing winds have died down. Relentless rain has ceased. The clouds have cleared and the sun is shining. But this is no time to let your guard down.

Last week, Hurricane Matthew pounded its way through the Caribbean before bearing down on the eastern U.S. coastline from Florida to North Carolina. Many lives and homes were tragically lost. But not all of the death and destruction happens during the storm itself. The aftermath is a treacherous time, with still-rising floodwaters, power outages, breaks in healthcare services, and increased risks for injury or illness. The mental and physical toll of a hurricane continues to mount even as it dispels and fades off into the ocean. We must remember that, although the storm has passed, danger remains present.

Beware of rising waters

After the rain ends, it can take days for rising rivers and streams to crest, or reach their highest point. This means that homes and roads that are not underwater at the end of the storm may be flooded in the days following.

In North Carolina, Matthew dumped 6 to 18 inches of rain, causing flooding that rivaled or surpassed that of Hurricane Floyd in 1999. But much of the water damage didn’t happen right away. Even as rescue and recovery efforts began, the state’s rivers continued to swell and overflow their banks, creating a second wave of destruction.

Driving on water-covered roads or through flooded areas can leave you hurt or stranded – or worse. Help may not be able to reach you right away if you get stuck, and you won’t be able to see hazards like debris or sinkholes in your path. Avoid driving through flooded areas, especially when the water is fast moving. As little as six inches of water can cause you to lose control of your vehicle.

Avoid risks during power outagesAre you prepared? infographic

Hurricane Matthew knocked out power to millions of homes and businesses. People die from carbon monoxide poisoning after a hurricane or other disaster when trying to generate power, keep warm, or cook using gasoline or charcoal-burning devices. The carbon monoxide (CO) these devices produce is a silent killer – you can’t see it or smell it. To avoid being a victim, always use generators, grills, camp stoves, or other gasoline or charcoal-burning devices outdoors, and keep them at least 20 feet away from any windows, doors, or vents. Use a battery-powered carbon monoxide detector to alert you to any CO in your home.

Power outages can also result in injuries or deaths from fires. If the power is out, try to use flashlights or other battery-powered lights instead of candles. If candles are all you have, place them in safe holders away from anything that could catch fire, and never leave them unattended.

Drink safe water, eat safe food

After a hurricane, it’s important that the water you drink and food you eat is safe. Spoiled food or dirty water can make you and your family sick. Listen for water reports from local authorities to find out if your water is safe for drinking and bathing. If an advisory has been issued concerning contaminated water, use only bottled, boiled, or treated water for drinking, cooking, preparing food, and washing your hands. To keep from getting sick, throw away any food, drinks, or bottled water that may have come in contact with flood or storm water, or any food that has been in the refrigerator if you have been without power for more than four hours.

Stay healthy in shelters

Shelters keep you safe while you wait to return to your home, but can also present some health risks. Illnesses can erupt and spread quickly, which is why CDC and other organizations send experts after a hurricane like Matthew to watch for any sign of an outbreak. It can also be harder to manage chronic illnesses while you’re in a shelter, especially if you need medications or special supplies to care for yourself or your loved ones. Keep extra copies of your prescriptions in case of an emergency.

Home safe home

Be sure to wait to return home until authorities say it is safe to do so. Returning to your home after the storm can present a whole new set of dangers, including downed power lines, flooded roads, and the difficult work of cleaning up. Remember, never touch a downed power line or anything in contact with them. Use chainsaws safely, and wear safety gear like a hard hat, safety glasses, ear plugs, thick work gloves, and boots as you make repairs.

If your home has been affected by flooding, follow these guidelines for safe cleanup after disasters. People with certain health conditions should not take part in the cleanup, and everyone should be careful to use the proper protective equipment. Any items that cannot be washed and cleaned should be removed from the home. Any drywall or insulation that has been contaminated with sewage or flood waters should be removed and discarded. You may want to take photos or hold onto items for which you’ll be filing an insurance claim.

Look around your home and drain any standing water. Standing water after a hurricane or flood is the perfect breeding ground for mosquitoes. Use insect repellant and consider staying indoors at dawn, dusk, or in the early evening when mosquitoes are most active.

Take care of your mind and heart

The mental and emotional effects of a disaster like Matthew can linger even months or years afterward. Be prepared to cope with feelings of fear, grief and depression. “Loss and displacement are some of the most stressful situations we face in our lives,” says CDC behavioral scientist Ruth Perou, PhD. “Even briefly being in a shelter can be very hard.”

Remember to take care of yourself. Try to get 6 to 8 hours of sleep, eat regular meals, and exercise as much as you can. ”The best thing you can do,” says Perou, “is get back to some sort of routine as quickly as possible, especially for children.”

Stress and feeling overwhelmed are normal and expected reactions to any sudden change. Reach out to family and friends, and talk to others in your community about your worries. Let your child know that it’s okay to feel upset when something bad or scary happens. Coping with these feelings and getting help when you need it will help you, your family, and your community recover from a disaster.

The Substance Abuse and Mental Health Services Administration (SAMHSA) Disaster Distress Helpline is available 24 hours a day, 7 days a week. Trained counselors are ready to answer any questions or help cope in the aftermath of Hurricane Matthew and other disasters. To connect with them, call 1-800-985-5990 or text TalkWithUs to 66746.