《Table 1 Basic situation of sampling site s》

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《Analysis on Biological Stability and Influencing Factors of Northern Living District Water Distribution System》

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The test w as implemented in a housing estate w ater distribution system located in the north of China.Source w ater w as draw n from surface w ater，Songhuajiang River.To carry out the research under different hydraulic conditions，six sampling sites w ere selected.The information w as show n in Fig.1，site 1is at the entrance of the housing estate，and the rest of sites 2-6 covered the entire housing estate.The mains are composed primarily of unlined cast iron，and the diameter w as betw een 100 and 300 mm.Water sample w as taken one time each w eek in w inter，and tw o times every w eek in summer.The temperature of w ater w as respectively 1℃and 25℃in w inter and summer.The pipe information w as show n in Table 1.