- How French Drains Work (practical.engineering)
In February of 2017, one of the largest spillways in the world, the one at Oroville Dam in northern California, was severely damaged during releases from heavy rain. You might remember this. I made a video about it, and then another one about the impressive feat of rebuilding the structure. In the forensic report following the incident, one of the contributing causes identified in the failure was the drainage system below the spillway. Rather than being installed below the concrete, each drain protruded into it, reducing the thickness of the concrete and making it more prone to cracking.
volunteer civil defense organization
- Syrian civil war (Wikipedia)
The Syrian civil war (Arabic: ٱلْحَرْبُ ٱلْأَهْلِيَّةُ ٱلسُّورِيَّةُ, romanized: al-ḥarb al-ʾahlīyah al-sūrīyah) is an ongoing multi-sided conflict in Syria involving various state-sponsored and non-state actors. In March 2011, popular discontent with the rule of Bashar al-Assad triggered large-scale protests and pro-democracy rallies across Syria, as part of the wider Arab Spring protests in the region. After months of crackdown by governments security apparatus, various armed rebel groups such as the Free Syrian Army began forming across the country, marking the beginning of the Syrian insurgency. By mid-2012, the crisis had escalated into a full-blown civil war.
