cables of 13-gage galvanized wire with 1 1/2-inch spaces. All of the 

 picket fencing was erected on nominal 2 by 4-inch wood posts placed 

 10 feet on center. For the first sections at San Luis Pass, posts 6 

 feet long were set 2 1/2 feet deep with the remaining 3 1/2 feet above 

 ground and faced so that the 2-inch side would be parallel to the line 

 of fencing for nailing. Subsequent sections in the Corpus Christi area 

 were erected on posts 5 feet long, set 2 feet in the ground, with the 

 4-inch width faced to receive the fencing. These post settings were more 

 economical and provided a wider, more rigid nailing surface. Extension 

 of the slat fencing 1 foot above the top of the posts had no adverse 

 effect on the stability of the fence. 



A second tier of fencing was placed on top of the original wood 

 picket fence in the Packery Channel area about 4 months after installa- 

 tion of the initial fence and after the dunes had formed to about 3 1/2 

 feet above natural ground. The second tier fencing was comprised of 

 about 150 feet of polyethylene plastic material with 5/8-inch mesh and a 

 porosity of 82 percent, about 150 feet of 1/4-inch mesh plastic material 

 with a porosity of 68 percent, and about 100 feet of wooden picket fence 

 for comparison purposes . 



Soon after installation, portions of the three added sections were 

 blown down or destroyed by vandalism, and no surveys were made to deter- 

 mine comparative sand volume accumulations. Observations did indicate 

 that fabric fence with the lower porosity trapped more sand than fabric 

 with high porosity, and that the wood picket fence trapped more than 

 either of the fabric types . 



Additional information of the fabric type fencing may be found in a 

 paper by Savage and Woodhouse. (Savage, R. P. and Woodhouse, W. W. Jr., 

 1968, "Creation and Stabilization of Coastal Barrier Dunes", a paper 

 published in Proceedings of the 11th Conference on Coastal Engineering, 

 ASCE, held in London in 1968.) 



Table I shoWs average volumes of sand accumulated by the various 

 fences at the four experimental areas. Locations of the typical sections 

 correspond with the lengths in feet on plans shown on Figures 4 through 

 14. Although the table reflects average volumes for fence sections of 

 several hundred feet, some smaller sections of about 100 feet in length 

 accumulated up to 16.1 cubic feet of sand per linear foot of fence. 



4. VEGETATION 



Efforts were made to establish grass to accelerate sand accumulation 

 and stabilize parts of new dunes in the San Luis Pass, Packery Channel, 

 and Newport Pass areas. Five 30- by 100-foot and six 40- x 50-foot plots 

 were sprigged or seeded in the San Luis Pass area and seventeen 40- by 100- 

 foot plots were sprigged or seeded in the two areas near Corpus Christi. 

 The planting was done during December 1965 at San Luis Pass and during 

 March 1966 at Packery Channel and Newport Pass. Some plots were sprigged 



