The canyons of the upper Guadalupe River have a capacity to carry 40,000 - 50,000 cubic feet per second (1,100 - 1,400 m³/s) ; however, the channel on the lower Guadalupe River, downstream from the Balcones Escarpment, can carry only 13,000-30,000 cubic feet per second (400 – 800 m³/s).
ðə kˈænɪənz ʌvðɪ ˌʌpɚ ɡwˈɑːdɐlˌuːp ɹˈɪvɚ hæv ɐ kəpˈæsᵻɾi tə kˈæɹi fˈoːɹɾi,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ fˈɪfti,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ kjˈuːbɪk fˈiːt pɜː sˈɛkənd wˈʌn,wˈʌnhˈʌndɹɪd wˈʌn,fˈoːɹhˈʌndɹɪd ˈɛm θɹˈiːslæʃ ˈɛs ; haʊˈɛvɚ, ðə tʃˈænəl ɔnðə lˈoʊɚ ɡwˈɑːdɐlˌuːp ɹˈɪvɚ, dˈaʊnstɹiːm fɹʌmðə bˈælkoʊnz ɪskˈɑːɹpmənt, kæn kˈæɹi ˈoʊnli θˈɜːtiːn,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ dˈæʃ θˈɜːɾi,zˈiəɹoʊzˈiəɹoʊ zˈiəɹoʊ kjˈuːbɪk fˈiːt pɜː sˈɛkənd fˈoːɹhˈʌndɹɪd ˈeɪthˈʌndɹɪd ˈɛm θɹˈiːslæʃ ˈɛs.