▁Unless ▁specifically ▁requested ▁by ▁the ▁applic ant , ▁Cert ificate ▁of ▁Survey ▁is ▁not ▁transm itted ▁by ▁post . ▁ ▁H ydro graph ic ▁Department ▁ ▁Hy ro graph er ▁is ▁the ▁Head ▁of ▁the ▁H ydro graph ic ▁department ▁within ▁the ▁M MB . ▁Vari ous ▁hydro graph ic ▁studies ▁are ▁carried ▁out ▁under ▁his ▁super vision . ▁ ▁These ▁studies ▁help ▁establish ▁need ▁for ▁d red ging ▁in ▁the ▁identified ▁areas . ▁He ▁undert akes ▁pre ▁and ▁post ▁H ydro graph ic ▁Sur ve ys ▁for ▁d red ging ▁requirements ▁and ▁has ▁a ▁data ▁bank ▁of ▁over ▁ 1 1 5 0 ▁bath ym et ric ▁charts , ▁which ▁are ▁made ▁available ▁to ▁the ▁users ▁on ▁payment . ▁ ▁He ▁also ▁undert akes ▁surve ys ▁related ▁to ▁navig ational ▁safety ▁and ▁port ▁development , ▁provides ▁bath ym et ric ▁data ▁for ▁all ▁potential ▁sites ▁for ▁planning ▁and ▁execution ▁of ▁various ▁projects , ▁and ▁undert akes ▁the ▁work ▁of ▁publication ▁of ▁T ides ▁every ▁year . ▁The ▁H ydro graph ic ▁Department ▁has ▁three ▁full - f led ged ▁survey ▁parties ▁which ▁are ▁equ ipped ▁with ▁latest ▁hydro graph ic ▁equipment ▁like ▁D iffer ential ▁Global ▁Position ing ▁System ▁( D G PS ), ▁dual ▁frequency ▁echo ▁sound ers , ▁current ▁meters , ▁automatic ▁t ide ▁gauge , ▁digital ▁level ▁& ▁Hyp ack ▁H ydro graph ic ▁Software . ▁ ▁Civil ▁Engineering ▁Department ▁▁ ▁Res p ons ible ▁for ▁construction , ▁maintenance ▁and ▁rep airs ▁of ▁all ▁types ▁of ▁civil ▁constru ctions