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



PLATE IX. 



Fig. 1. — View toward dam and spillway, Bayou Walnut, from upstream, showing bayou filled 



with water. 



Fig. 2.— View across Bayou Walnut, showing aquatic grass, Zizaniopsis miliacca, in bed of bayou, 



above impounded zone. 



Fig. 3. — View along margin of Bayou Walnut, above impounded zone, showing natural bayou 



conditions. 



IMPOUNDING WATER TO CONTROL MALARIA MOSQUITOES. 



