Only in the 1950s did the textile industry recover somewhat. Nowadays, because of competition and the prevalence of computer-operated embroidery machines, only a reduced textile industry has survived in St. Gallen; but its embroidered textiles are still popular with Parisian haute couture designers. Gallen is situated in the northeastern part of Switzerland in a valley about above sea level. It is one of the highest cities in Switzerland and thus receives abundant winter snow. The city lies between Lake Constance and the mountains of the Appenzell Alps (with the Säntis as the highest peak at ). It therefore offers excellent recreation areas nearby. As the city center is built on an unstable turf ground (its founder Gallus was looking for a site for a hermitage, not for a city), all buildings on the valley floor must be built on piles. For example, the entire foundation of the train station and its plaza are based on hundreds of piles. Gallen has an area, , of . Of this area, 31.1% is used for agricultural purposes, while 28.9% is forested. Of the rest of the land, 38.4% is settled (buildings or roads) and the remainder (1.7%) is non-productive (rivers or lakes). Between 1981 and 2010 St. Gallen had an average of 141 days of rain or snow per year and on average received of precipitation. The wettest month was July during which time St. Gallen received an average of of rain. During this month there was precipitation for an average of 13.8 days. The month with the most days of precipitation were June and July May. The driest month of the year was February with an average of of precipitation over 9.1 days. Gallen is notable for reporting the highest maximum radioactivity measurements of any Swiss city, as published in the 2009 yearly report by the Federal Office of Public Health. While the daily average level of gamma-ray radioactivity in the city is unremarkable at 105 nSv/h, the maximum can reach 195 nSv/h, as high as the average for Jungfraujoch, the location with the highest reported level of radioactivity in Switzerland, due to its high elevation and therefore greater exposure to cosmic rays. The same report explains that the unusually high spikes of radioactivity measured in St. Gallen are due to radioactive products of radon gas being washed to the ground during heavy storms, but does not explain where the sufficient quantities of radon gas and its products to account for the anomaly would come from.