The highest annual rainfall recorded is 257 cm (101 in) in 2005.[114] Prevailing winds in Chennai are usually southwesterly between April and October[115] and north-easterly during the rest of the year. Historically, Chennai has relied on the annual rains of the monsoon season to replenish water reservoirs, as no major rivers flow through the area.[116] Chennai has a water table at 2 metres for 60 percent of the year.[117]