BENSON RIOBA MIRIAM Bahero Musa sat on a yellow 20-litre jerrycan, a smaller white one in her hand, as she lined up with 20 other women to collect water at the Kiunga desalination plant on Kenya's coast. The solar-powered water farm converts salty seawater to clean water for drinking and washing. "Water is scarce in the area," said Musa, adding that local people are pretty much used to shortages. "We only get a temporary reprieve during rainy seasons," she added. The plant in Lamu County, near the border with Somalia, about 470 km (292 miles) east of Nairobi, is fitted…