Bui. 1098, U. S. Dept. of Agriculture. 



Plate vi. 



Fig. 1. — View showing construction of sijillway-box and downstream apron in dam. 



Fig. 2. — ^View across Bayou Walnut showing wing walls of spillway and bridge over spUlway 



box. 



■^^' 





^ 





i- 



^ 



^ 



Fig. 3.— Vie-.v acrosa Bayou Walnut at site of dam, showing roadway to opposite side of bayou. 

 IMPOUNDING WATER TO CONTROL MALARIA MOSQUITOES. 



