sˈʌtʃ ɹᵻstɹˈɪkʃənz ɔːɹ “tʃˈoʊkpˈɔɪnts” ɹɪzˈʌlt ɪn bˈʌlk ˌoʊvɚflˈoʊ ænd lˈoʊkəl ˈɪŋkɹiːsᵻz ɪn hˌaɪdɹəstˈæɾɪk pɹˈɛʃɚ, kˈɔːzɪŋ wˈɔːɾɚ tə mˈuːv ˈʌpwɚd θɹuː fˈɪʃɚz ˌɑːntʊ ðɪ ɚɹˈɪdʒɪnəl ˈaɪs lˈeɪɚ.
Such restrictions or “choke-points” result in bulk overflow and local increases in hydrostatic pressure, causing water to move upward through fissures onto the original ice layer.