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.
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.