Des'icjn Prob lem Ph us/cal Environment 



Page no : 



Calculated by 



Checked by: 



Date : 



/6 of /33 

 J. R. <V. 



P.(7.T 



Mar 73 



Ana/ys/s of Predicted Astronomical Tides 



Using the predicted tjigh tides for 

 Qreokv^ater Harbor^ Le)NeSy Delaware for ttie 

 years f^^Z, 1967 ^ /9^6 and 1972, the probabilities 

 that the water level will be above a given 

 level at an (J time were generated (by computer) 

 based on tt)e following sctieme. 



■Predicted high tides 

 Fitted sine curves^ 



Ref to 



dQtum 



Semi diurnal tide 



The priobab'ilify the water level will be above z 

 of any time is given by^ 



where 7^ is the length of the record analysed . 

 and 2tt is the amount of time the water level is 

 above z. The_ results of the analysis are given 

 on the following pages. 



based on ttjis analysis^ a water level above 

 f5.o ft (M.L.i^. datum) is exceeded f.o% of the 

 time. (See Figure d- 9 ) 



8-18 



