What does AQNA CURRIT ET DEBET CURRERE, UT CUR- RERE SOLEBAT mean?

AQNA CURRIT ET DEBET CURRERE, UT CUR- RERE SOLEBAT meaning in Law Dictionary

liquid runs, and must run, because has accustomed run. 3 Bulst. 339; 3 Kent, Comm. 439. A running flow should-be left to flow in its normal channel, without alteration or diversion. A fundamental maxim within the legislation of water-courses.