8:2ח׳:ב׳
1 א

ויסכרו מעינות. כְּשֶׁנִּפְתְּחוּ כְּתִיב כָּל מַעְיְנֹת; וְכָאן אֵין כְּתִיב כָּל, לְפִי שֶׁנִּשְׁתַּיְּרוּ מֵהֶם אוֹתָן שֶׁיֵּשׁ בָּהֶם צֹרֶךְ לָעוֹלָם, כְּגוֹן חַמֵּי טְבֵרְיָא וְכַיוֹצֵא בָהֶן:

ויסכרו מעינות AND THE FOUNTAINS … WERE STOPPED –– When they were opened, it was stated that all fountains were opened (7:11), whilst here the word all is omitted: the reason is that such of them as were essential to the world were left unstopped, such as the hot springs of Tiberias and their like (Sanhedrin 108a).

2 ב

ויכלא. וַיִמָּנַע כְּמוֹ לֹא תִכְלָא רַחֲמֶיךָ (תהלים מ'), לֹא יִכְלֶה מִמְּךָ (ברא' כג):

ויכלא means was restrained. withheld, as (Psalms 40:12) “Thou wilt not withhold (תכלא) thy mercies” and (Genesis 23:6) “None of us will withhold (יכלה) from thee.’’