nˈætʃɚɹəl lˈɛviːz ɑːɹ slˈoʊpt dᵻpˈɑːzɪts wˌɪtʃ fˈɔːɹm ɔnðə bˈæŋks ʌv tʃˈænəlz dˈʊɹɹɪŋ flˈʌdɪŋ ᵻvˈɛnts, sˈɜːvɪŋ æz bˈæɹɪɹz tə fjˈuːtʃɚ flˈʌdz.
Natural levees are sloped deposits which form on the banks of channels during flooding events, serving as barriers to future floods.