▁ir rig ation , ▁gard ens , ▁or ▁fl ushing , ▁while ▁only ▁the ▁best ▁would ▁be ▁reserved ▁for ▁drink ing ▁water . ▁Inter mediate - quality ▁water ▁would ▁be ▁used ▁for ▁the ▁many ▁bath s ▁and ▁f ount ains . ▁However , ▁Front inus ▁critic ized ▁the ▁practice ▁of ▁mixing ▁supplies ▁from ▁different ▁sources , ▁and ▁one ▁of ▁his ▁first ▁dec isions ▁was ▁to ▁separate ▁the ▁waters ▁from ▁each ▁system . ▁ ▁Main ten ance ▁He ▁was ▁very ▁concerned ▁by ▁le aks ▁in ▁the ▁system , ▁especially ▁those ▁in ▁the ▁under ground ▁condu its , ▁which ▁were ▁difficult ▁to ▁locate ▁and ▁m end , ▁a ▁problem ▁still ▁faced ▁by ▁water ▁engine ers ▁today . ▁The ▁aqu ed uct s ▁above ▁ground ▁needed ▁care ▁to ▁ensure ▁that ▁the ▁m ason ry ▁was ▁kept ▁in ▁good ▁condition , ▁especially ▁those ▁running ▁on ▁arch ed ▁super struct ures . ▁It ▁was , ▁he ▁said , ▁essential ▁to ▁keep ▁trees ▁at ▁a ▁distance ▁so ▁that ▁their ▁roots ▁would ▁not ▁damage ▁the ▁structures . ▁He ▁review ed ▁the ▁existing ▁law ▁gover ning ▁the ▁state ▁aqu ed uct s , ▁as ▁well ▁as ▁the ▁need ▁for ▁enfor cement ▁of ▁those ▁stat utes . ▁ ▁Military ▁tact ics ▁Front inus ▁also ▁wrote ▁a ▁theoretical ▁treat ise ▁on ▁military ▁science , ▁which ▁is ▁lost . ▁His ▁ext ant ▁work ▁on ▁military ▁matters , ▁the ▁Str at ag ems ▁( Lat in : ▁Str ateg em ata ), ▁is ▁a ▁collection ▁of ▁examples ▁of ▁military ▁strat ag ems ▁from ▁Greek ▁and