CE 327 Lecture Notes - Lecture 27: Nomogram, Manhole
Document Summary
Available pipe slopes for minimum cover: Mh2 b h2 y2 g = surface slope. L = length of pipe. S min, s = pipe. Elevabon inlet g = (y2- y1)/l, s = (e outlet - e inlet)/ l. Mh1 ground surface elevabon 1 = es. 1 minimum cover: b 3m every 400- 500 n must have a manhole, every pipe size, direcbon or slope change. 1 minimum cover is to account for frost- line and drainage from basements. S = ei - ei. 2 1 g = es - es. Es - es = gl. + h - (b+h ) = l(g- s) 2 h - h = l(g- s )max. 1 max slope: up to line of minimum cover, any greater would put the invert above b. L = 100 m g = (7. 80 - 7. 70) = 0. 001 = 0. 1%
