living standards, poor farmers in less than com plete eliminati on of 4600 Yua n, 8949, 19008. "Five waters r ule": the County investe d 2.169 billi on y uan, similar counties line the city' s first complete t he 42 km of sew age pi pe netw ork constr ucti on, completi on rate ranke d first in the city, w on the provincial r ural sewage treatment w ork better; key polluti on sour ces such as el ec
管段 设计 管段 管段 管内 长度 流量 直径 坡度 流速 h/d L(m) q(l/s) D(mm) I( ‰) v(m/s) (﹪) 上端 下端 上端 下端 上端 下端 上端 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1-2 140 56.82 450 1.20 0.22 0.62 0.279 0.168 347.150 347.400 345.429 345.261 345.150 344.982 2.000 2-3 470 63.52 450 1.10 0.54 0.72 0.324 0.517 347.400 347.650 345.261 344.744 344.982 344.465 2.463 3-4 750 154.24 700 0.52 0.50 0.78 0.546 0.390 347.650 347.250 344.744 344