3 sentences

1. 你可以通过调节阀门来控制水管的水量。

   nǐ kě​yǐ tōng​guò tiáo​jié fá​mén lái kòng​zhì shuǐ​guǎn de shuǐ​liàng.

   You can control the water volume in the pipe by adjusting the valve.

   Source: Dong Chinese Dictionary

2. 这台仪器可以精确地计量流经管道的水量。

   zhè tái yí​qì kě​yǐ jīng​què de jì​liàng liú​jīng guǎn​dào de shuǐ​liàng.

   This instrument can accurately measure the volume of water flowing through the pipe.

   Source: Dong Chinese Dictionary

3. 由于持续干旱，水库的水量已经降到了警戒线以下。

   yóu​yú chí​xù gān​hàn, shuǐ​kù de shuǐ​liàng yǐ​jīng jiàng​dào le jǐng​jiè​xiàn yǐ​xià.

   Due to the ongoing drought, the water level in the reservoir has dropped below the warning line.

   Source: Dong Chinese Dictionary