mean sea level pressuremean section methodmean velocitymean velocity curvemean water stage of rivermean water trainingmeandermeander belfmeander lengthmeander ratiomeander scouringmeander widthmeandering meandering rivermeandringmeasuring weirmechanical analysismechanical erosionmechanical practicesmechanical rakemechanical turbulencemechanically cleaned screenmeckmedianmedian diametermedian stream flowmedicmediteraneanmediterranean climatemediterranean frontmediummedium range forecastmedium sandmedium texture soilsmeeting of two surgesmega barchanmega ripplesmelting pointmeltwatermeniscusmercurymercury barometermeshmesh screenmesh sizemesicmesoclimatemesoclimatologymesometeorologymesopausemesosphere