Indeed, background leakage is so pervasive that water suppliers accept 3,500 litres of water per kilometre of pipe per day as the minimum achievable loss.
事实上，底面渗漏现象随处可见，供水商也接受了每日每千米管道3500升的最低漏水量。
2
Indeed, background leakage is so pervasive that water suppliers accept 3, 500 litres of water per kilometre of pipe per day as the minimum achievable loss.
事实上，底面渗漏现象随处可见，供水商也接受了每日每千米管道3500升的最低漏水量。
3
The linear loss of sewage flowing in pipe is approximately equal to that of water pipe flow. So it's feasible to accept the method in use at present.