dusty scale for water level measurement of river

scale rusty dusty river low level water lowest levels calibrated vertical column spider nets drought measuring watercourse alarming environment heat watering restrictions flows record lows forecast supplies shortages hydrology meteorology dry weather climate rainfall reserves global warming waves rockbottom concrete riverside banks shallow infrastructure groundwater flood control nature vegetation eucalyptus springtime landscape tranquil blue cloudy sky outdoors mediterranean region guadiana extremadura badajoz spain travel vaden talavera real dip ditch measurement river visible