8 BULLETIN 1&8; V. S. DEPARTMENT OF AGEICULTUEE. 



August 13-16, 1911, 7.9 inches; February 9-15, 1908, 9.7 inches; and 

 July 27-August 2, 1902, 9.2 inches. The heaviest 48-hour rainfalls 

 were: August 13-14, 1911, 7.1 inches; February 13-14, 1908, 6.8 

 inches; and July 30-31, 1902, 7.8 inches. The greatest 24-hour rain- 

 fall recorded at Arkansas City occurred on April 4, 1911, when 5.6 

 inches fell. Other heavy 24-hour storms were 5.5 inches on July 17, 

 1906; 5.5 inches on August 13, 1911; and 5.1 inches on December 

 27, 1904. From January, 1897, to December, 1912, there are recorded 

 13 days when 3 inches or more fell in 24 hours, and 63 days when 2 

 inches or more fell in a like period. The most intense rainfall on 

 record at Arkansas City occurred on July 17, 1906, when 4.8 inches 

 fell in 2 hours. 



Among the heaviest storm periods at Pine Bluff were: November 

 16-21, 1906, 10.3mches; May 4-6, 1905, 9.4 mches; and January 1-3, 

 1897, 9 inches. The heaviest 48-hour rainfalls were: November 

 16-17, 1906, 6.6 inches; May 4-5, 1905, 8.8 inches; and July 31- 

 August 1, 1902, 6.9 inches. The heaviest 24-hour rainfalls on record 

 at Pine Bluff are: 5.65 inches on January 21, 1906; 6.8 inches on May 

 4, 1905, and 5.58 inches on January 3, 1897. Other unusually heavy 

 24-hour storms recorded are 4.7 inches on November 19, 1907, and 

 4.7 inches on July 31, 1902. During the 16 years from 1897 to 1912 

 there were 32 days when 3 inches or more fell in 24 hours, and 84 days 

 when a rainfall of 2 inches or more was recorded. 



STREAM GAUGING AND OTHER INVESTIGATIONS. 



During the spring of 1911 run-off investigations were made on 

 Boggy Bayou, the outlet for Desha Comity district No. 1. The area 

 of this district is 165 square miles above the point where the discharge 

 measurements were made. On April 4, 1911, occm^red the heaviest 

 24-hour precipitation on record. This caused a measured discharge 

 of 1,815 second-feet, or a run-off of 11 second-feet per square mile 

 from the district. In March and April, 1912, very high stages 

 occurred in Boggy Bayou. During the latter part of March and April, 

 the Mssissippi Riv^ rose very rapidly, and probably about March 

 27-29 the water began to flow from Cypress Creek and Wells Bayou 

 to Boggy Bayou thi'ough Johnson Brake, Newman Slough, and Amos 

 Bayou. The water begins to take this course when the Mississippi 

 River backwater reaches an elevation of approximately 149 in 

 Cypress Creek. It is probable that under present conditions the 

 maximum discharge from Boggy Bayou due to precipitation alone 

 seldom, if ever, exceeds that of April 4, 1911. 



Stream measurements were made on Cypress Creek at the Mem- 

 phis, Helena & Louisiana Railroad bridge south of Watson in March, 

 1912, until the backwater from the Mssissippi River became too 

 high. These measurements show that just before the river water 



