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Tidal Currents, Continued - 14221_197
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Current Calculations - 14221_199
Tidal Current Tables Layout Tidal  Current  Tables  are  tables  that  give  daily  predictions  of  the  times and  speeds  of  the  tidal  currents.  The  tables  are  issued  annually  in  two volumes:  one  for  the  Atlantic  Coast  of  North  America  and  the  other  for the  Pacific  Coast  of  North  America.  These  tables  are  set  up  basically the  same  as  the  Tide  Tables.  The  Tidal  Current  Tables  consist  of  five tables  plus  a  number  of  current  diagrams  and  data  concerning wind-driven  currents,  the  gulf  stream,  the  combination  of  currents,  and current  diagrams.  A  brief  discussion  of  the  five  tables  is  given  below. Table  1  -  Daily  Current  Predictions.  This  table  gives  the  predicted times  of  slack  water  and  the  predicted  times  and  speeds  of  maximum current,  both  flood  and  ebb,  for  each  day  of  the  year  at  a  number  of reference  stations.  Also  listed  at  the  top  of  each  page  is  the  direction  of set  toward  which  the  currents  flow.  Like  the  Tide  Tables,  data  in  this book  are  listed  in  standard  time,  so  you  must  add  1  hour  to  convert  the times  to  daylight  savings  time. Table  2  -  Current  Differences  and  Other  Constants  and  Rotary Currents.  This  table  lists  data  for  subordinate  stations.  When  this  data is  applied  to  the  predicted  times  and  speeds  at  the  appropriate  reference stations,  reasonable  approximations  of  the  current  at  the  subordinate station  may  be  computed.  Later  in  this  assignment,  we  will  use  tables  1 and  2  to  calculate  the  speed  of  current  at  a  subordinate  station. Table  3  -  Speed  of  Current  at  Any  Time.  This  table  allows  you  to calculate  the  current  at  any  time,  not  just  the  time  of  slack  and maximum  current.  We  will  work  an  example  problem  later  in  this assignment. Table  4  -  Duration  of  Slack.  This  table  provides  a  means  of calculating  the  approximate  period  of  time  during  which  weak  currents not  exceeding  0.1  to  0.5  knots  will  be  encountered.  This  duration includes  the  last  of  the  flood  or  ebb  and  the  beginning  of  the  following ebb  or  flood,  or  half  the  duration  will  be  before  and  half  after  the  time of  slack  water.  Buoy  tender  sailors  may  find  this  table  helpful  if  an  aid to  navigation  can  only  be  worked  safely  at  slack  water. Table  5  -  This  table  lists  data  for  a  number  of  offshore  stations  for  the direction  and  average  speed  of  the  rotary  tidal  current  for  each  hour  of the tidal cycle. 7-18

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