Just got a quote for a CMP (corrugated metal pipe)for my spillway. 24" diameter, 48" riser,66' length, 16 guage galvanized pipe. $250.00 labor to weld the 90 degree anlge at $11.25 per foot =$1037.00. Does anyone know if aluminum would be better? I am sure it costs more. Contech said the galvanized pipe would last 100 years. I dont want my grandkids to have to be replacing it if I could do it with aluminum now.
