David W. Walker
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davidwalkerh2o.bsky.social
David W. Walker
@davidwalkerh2o.bsky.social
Freelance consultant working on drought, hydrogeology, socio-hydrology, and citizen science 🚰🏜️🏔️🌍.
Alternatively, you are most likely to find me running over mountains or at the bottom of the sea 🏃‍♂️🤿🦈.
📣New paper!
Led by Annelieke Duker, research comparing the #sand_mining situation in #sand_rivers in Botswana, Kenya & Ethiopia reveals common conflicts & challenges like impacts on dryland water availability & how to estimate sustainable sand yield. ⛏️💧🧑‍🌾
See: www.sciencedirect.com/science/arti...
July 27, 2025 at 8:42 AM
📣New paper!
Led by Louise Cavalcante, research from Ceará, Brazil, shows how local development policies can interrupt the cascading impacts of #drought - not just by supplying more water, but by supporting livelihoods and resilience. 💧🧑‍🌾🌽
See: nhess.copernicus.org/articles/25/...
June 20, 2025 at 5:33 AM
Back to real hydrogeology in the Caucasus⛲. Alongside the usual drilling hazards, there are A LOT of snakes (saw 3 on Tuesday, all venomous🐍), A LOT of minefields💣, mid 30s temperatures🥵, and the ghosts of a variety of peoples who inhabited this area prior to recent decades☠️.
June 12, 2025 at 10:45 AM
📣New publication!
"Baseline Assessment of Drought Impact Monitoring" by Integrated Drought Management Programme. It was really interesting to work on and presents a range of worldwide initiatives, often with a non-drought focus, that provide valuable drought impact data. See: shorturl.at/HZcK6
May 28, 2025 at 11:14 AM
Reposted by David W. Walker
In least-developed countries & low to middle-income countries, drought is still the single greatest cause of agricultural production loss.

What’s more, it impacts agriculture almost exclusively 👉 bit.ly/3Bny3c5

#UNited4Land #EarthDay
April 22, 2025 at 9:05 AM
Back to hydrogeological consulting for a while. I was flown straight to the Caucasus with the task of sorting this out:
⛏️💰☠️
April 17, 2025 at 9:53 AM
📣New paper!
Led by Heidi Kreibich, "Panta Rhei: a decade of progress in research on change in hydrology and society" synthesises the findings of the IAHS scientific decade “Panta Rhei – Everything Flows: Change in hydrology and society” (2013–2022). See: rb.gy/9r63l3
April 4, 2025 at 8:13 AM
📣New paper!
A pilot study on the impacts of #sand_mining, involving many site visits & interviews with varied stakeholders, showed how both legal & illegal operations cause a range of issues, but not always. Governance & site selection must be improved. See: tinyurl.com/p94nszsa ⏳🏗️🚰🧑‍🌾🌽🦜
March 13, 2025 at 2:42 PM
How do you grow food on arid São Vicente, Cabo Verde? This fog trap on the island's highest mountain yields 3000 litres of water per week; enough for a small plot and to provide tea, coffee and excellent ponche to tourists. Could this be scaled up? #water_scarcity #NbS
March 6, 2025 at 4:41 PM
There was a time in Europe when the provision of fresh water was so valued, that monumental architecture was devoted to it. Here is the Bydgoszcz Water Tower, completed in 1900.
February 17, 2025 at 4:09 PM
Reposted by David W. Walker
Can we use paleo for detection and attribution of drought without a climate model? Yes!

New work led by @drkatemarvel.bsky.social, with me and some old guy.

agupubs.onlinelibrary.wiley.com/doi/10.1029/...
Global Warming Is Likely Affecting Regional Drought Across Eurasia
Rigorous climate change detection and attribution is possible without the use of general circulation model simulations 21st century Eurasian hydroclimate patterns are incompatible with pre-indust...
agupubs.onlinelibrary.wiley.com
February 13, 2025 at 8:38 PM
Reposted by David W. Walker
1/2. 📣POSTDOCTORAL RESEARCH FELLOW WANTED: The African Synthesis Centre for #ClimateChange, Environment and Development is looking for a Postdoctoral Research Fellow for “Unpacking Non-economic #LossAndDamage in Africa” 🔥⛈️ .

⏰ Deadline: 23 February
✏️Apply: ascendclimate.org/wp-content/u...
February 12, 2025 at 6:29 PM
Just back from Saudi Arabia. Always on the lookout for historic and transferable climate adaptation methods, here is Al-Balad, Jeddah’s old town. The intricate wooden lattice windows weren’t just for privacy, they’re a time-tested cooling system, channeling breezes while keeping out the fierce sun.
February 12, 2025 at 11:21 AM