AN UNBIASED VIEW OF ท่อน้ำฝน

Use picket stakes and Mason’s line or chalk line to create a square or rectangular form around the marked area. Be certain the formwork is amount and secure. Even though making the formwork, make allowance for the slope to the center of the drain.ดังนั้นการจะนําน้ำมาใช้ หรือ การจัด