: ▁ 3 6 ▁ft / s ▁( 1 1   m / s ) ▁ ▁Water ▁speed ▁at ▁the ▁minimum ▁flow : ▁ 1 6 ▁ft / s ▁( 5   m / s ) ▁ ▁History ▁After ▁the ▁great ▁flo ods ▁of ▁the ▁second ▁part ▁of ▁the ▁ 1 9 th ▁century ▁( the ▁last ▁in ▁ 1 8 8 2 ), ▁defense ▁of ▁the ▁city ▁of ▁Ver ona ▁from ▁Ad ige ▁flo ods ▁was ▁de emed ▁ur gent . ▁Using ▁an ▁idea ▁already ▁established ▁in ▁the ▁ 1 8 th ▁century , ▁Ven ice ' s ▁Water ▁Mag istr ate ▁proposed ▁construct ing ▁a ▁di version ▁tunnel ▁to ▁Lake ▁Gard a ▁that ▁would ▁alle vi ate ▁flo oding ▁by ▁con ve ying ▁that ▁part ▁of ▁the ▁Ad ige ' s ▁flow ▁exceed ing ▁the ▁river ' s ▁carrying ▁capacity . ▁The ▁lake ' s ▁surface ▁area , ▁equal ▁to ▁about ▁ 1 4 2 ▁square ▁miles ▁( 3 7 0   km ² ), ▁would ▁allow ▁the ▁di version ▁of ▁huge ▁volumes ▁of ▁river ▁water ▁with ▁only ▁a ▁mod est ▁increase ▁in ▁the ▁lake ' s ▁level . ▁The ▁most ▁appropriate ▁solution ▁was ▁considered ▁to ▁be ▁a ▁tunnel ▁origin ating ▁on ▁the ▁right ▁bank ▁of ▁the ▁Ad ige ▁near ▁Rav azz one ▁( a ▁sub div ision ▁of ▁Mor i ) ▁and ▁termin ating ▁at ▁Lake ▁Gard a ▁to ▁the ▁south ▁of ▁Tor bo le . ▁The ▁depth ▁of ▁the ▁lake ▁at ▁that ▁location ▁would ▁allow ▁solid ▁material ▁that ▁might