kˈɑːlks wɜː fˈɜːst aɪdˈɛntᵻfˌaɪd baɪ ðə dˈʌtʃ, hˌuː əbzˈɜːvd kˈɑːlks hˈɔɪstɪŋ sˈɛvɹəltˈʌn blˈɑːks ʌv ɹˈɪpɹæp fɹʌm dˈaɪks ænd tɹænspˈoːɹɾɪŋ ðˌɛm ɐwˈeɪ, səspˈɛndᵻd əbˌʌv ðə bˈɑːɾəm.
Kolks were first identified by the Dutch, who observed kolks hoisting several-ton blocks of riprap from dikes and transporting them away, suspended above the bottom.