▁regular ▁cast ▁member ▁in ▁the ▁season ▁ 1 2 ▁episode ▁" Tab oo " ▁later ▁in ▁the ▁year . ▁ ▁She ▁is ▁now ▁the ▁Unit ▁Chief ▁of ▁the ▁B AU , ▁following ▁the ▁departure ▁of ▁A aron ▁Hot ch ner . ▁ ▁References ▁ ▁External ▁links ▁ ▁Category : C riminal ▁M inds ▁characters ▁Category : F ict ional ▁Be havior al ▁Analysis ▁Unit ▁agents ▁Category : F ict ional ▁characters ▁from ▁Washington , ▁D . C . ▁Category : T ele vision ▁characters ▁introduced ▁in ▁ 2 0 0 6 ▁Category : F ict ional ▁lingu ists <0x0A> </s> ▁H yd ra ul ic ▁calculations ▁are ▁a ▁practice ▁within ▁the ▁fire ▁safety ▁industry ▁of ▁determ ining ▁the ▁flow ▁of ▁liqu ids ▁through ▁a ▁medium ▁( us ually ▁a ▁pip ing ▁network ) ▁to ▁ensure ▁that ▁fires ▁can ▁be ▁ade qu ately ▁controlled . ▁ ▁Pur pose ▁H yd ra ul ic ▁calculations ▁are ▁often ▁required ▁to ▁prove ▁the ▁flow ▁of ▁water ▁( or ▁water ▁mixed ▁with ▁add it ives ▁like ▁fire f ight ing ▁fo am ▁concent rate ) ▁through ▁pip ing ▁networks ▁for ▁the ▁purpose ▁of ▁suppress ing ▁or ▁ex ting u ishing ▁a ▁fire . ▁The ▁full ▁hyd ra ul ic ▁calculation ▁procedure ▁is ▁defined ▁in ▁the ▁applicable ▁reference ▁model ▁codes ▁such ▁as ▁published ▁by ▁N F PA ▁( National ▁Fire ▁Prote ction ▁Association ), ▁or ▁EN ▁ 1 2 8 4 5 ▁F ixed ▁fire f ight ing ▁system ▁– ▁Autom atic ▁spr ink ler ▁systems ▁– ▁Design ,