室外雨水管坡度相关规定:①给水管,0.002-0.005;②喷淋管,充水管道≥0.002,不充水管道≥0.004.③热水管、蒸汽管、燃气管:0.003;④室内排水管(通气管):a.排水铸铁管通用坡度:DN50,0.035;DN75,0.025;DN100,0.020;DN125,0.015;DN150,0.010b.粘接、熔接排水塑料管横支管的标准坡度为0.026.c.胶圈密封连接排水塑料管横支管的通用坡度:DN50,0.025;DN75,0.015;DN110,0.012;DN125,0.010;DN160,0.007.d.排水通气管0.010.⑤室外排水管:接户管0.005(De160),支管0.005(De160),干管0.004(De200)。⑥室外雨水管:接户管0.003(DN200),支管、干管0.015(DN300)