A thesis of this book, a study to find the coefficient of uneven (Manning's, n). For perforated concrete made of different sizes which total mass ratio of the cavity and the flow rate of various different. Application of perforated concrete must be used in the deck surface Canal and promote the construction of a canal used concrete porosity to be beautiful. It also allows small plants can also help reduce the heat from the water to form a solid concrete irrigation canal General. To enhance the ecological balance It also makes the area around the Canal are moisture throughout the year that can plant vegetables the Canal. It also helps reduce greenhouse (Green House Effect) and global warming (Global Warming). Causes of decrease in light and environmentally friendly too.
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