Water separation in flowlines or trunk lines

A system comprising:

• a sink attached to a horizontal flowline configured to flow a mixture of at least two immiscible fluids, wherein one of the immiscible fluids is water, wherein the water is more dense than the other of the at least two immiscible fluids, wherein the sink is configured to collect at least a portion of the at least two immiscible fluids flow;
• an outlet formed at a bottom portion of the sink;
• a valve system connected to the outlet, the valve system configured to open the outlet in response to the water occupying at least a portion of the sink;
• and
• wherein the sink is attached in place of a removed bottom portion of the horizontal flowline, wherein the system further comprises a perforated plate configured to attach to a bottom surface of the horizontal flowline between the horizontal flowline and the sink, the perforated plate configured to flow at least the portion of the mixture of the at least two immiscible fluids from the horizontal flowline into the sink, the perforated plate positioned at the removed bottom portion between the horizontal flowline and the sink.