EXCESSIVE RAINS 53 



16. Refer to the judicial decisions of p. 38 and summarize the 

 opinion of the court in those two cases. 



17. From the publications of the U. S. Weather Bureau, secure data 



on maximum storms covering a period of 10 years for the city of 



Construct an intensity diagram and draw two curves, one for maximum 

 storms, and one excluding storms more infrequent than once in 3 years. 



18. Change the form of the equations of Table IV to that of the 

 equation for the Philadelphia curves, and judge of the frequency of 

 "storms of extraordinary rainfall" by the comparison. 



19. If an extraordinary storm, occurring on the average once in 12 

 years, might cause an estimated damage of $25,000, how much money 

 might reasonably be spent on enlarging a sewer designed to safely carry 

 storm water from maximum storms occurring once in 3 years? 



20. Using data from Monthly Weather Re-view plot curves for three 

 typical storms in order to show the relation between duration and intensity 

 for any one storm. 



