National Geographic : 1942 Feb
Taming "Flood Dragons" Along China's Hwang Ho 215 Dike Builders Stretch a "Dragon Net" to Make Both Ends Meet Hemp ropes, tightly entwined, cover the narrowed gap. Soon the net will be filled with bags of earth and kaoliang stalks, then lowered into the water (see below). Slowly the Heavy-laden "Dragon Net" Slides into the Gap Workmen gradually release the ropes, which are fastened to stakes. This is a secondary barricade, built to cut off leakage from a main dike.