PRKSIOKNTIAL ADDRESS SECTION A. 



35 



TABLE E. 



Taking^ the averag[e flow per month of the Vaal River at 

 Vereeniging over a period of 13 years (1900- 1905 and 1910-1918), 

 the discharges are in the following order : — 



Month. 



1. January (Highest) 



2. March 



3. November 



4. February 



5. December 



6. October 



7. April 



8. May 



9. August 



10. September 



11. July 



12. June (lowest) 



Million Cubic 

 Feet. 



22,507 



17,163 



16,464 



15.582 



13740 



3,678 



2.863 



1,472 



1,011 



754 

 573 

 556 



TABLE F. 



Discharge of Vaal River at Vereeniging. 



Hydrographic 



Year October to 



September. 



19OO-1901 

 19OI-1902 

 1902- 1903 

 1903- 1904 

 1 904- 1 90 5 



1910 

 191O-1911 

 1911-1912 

 I912-1913 



1913-1914 

 1914-1915 

 1915-1916 

 I916-1917 

 1917-1918 

 1918-I919 



Discharge 

 in Million 

 Cubic 

 Feet. 



34,950 

 36,176 



16.184 



77,582 



5,666 

 66,738 

 86,092 



41.592 



25,768 



14,278 



152,334 

 102,406 



46,158 

 522,303 



81,070 



Average 



Annual 



Rainfall 



in Inches. 



33-57 

 2539 



28.57 



25.00 

 29.72 

 26.62 

 33.60 

 40.26 



Percent- 

 age r'jn off 



Remarks. 



10 months only. 



3 months only 

 8 months only. 



1 1 months only, 

 October missing. 



6.97 



4-45 

 2.43 



1-55 

 13.92 



10.45 

 3-74 



35-25 

 — 8 months only. 



Notes. — The discharge figures for the period 1900 to 1905 are 

 from a catchment area of 15,839 square miles, and 'for the 

 period 1910-1919 from an area of 16,319 square miles. 



No rainfall records over the catchment area are avail- 

 able for the period 1900-1905, so that the run-oi¥ percentages 

 cannot be calculated. 



