Source: Tafsir al-Ahlam al-Kabir (Ibn Sirin)
The gutter in a dream is a man who spends another's money or a servant who conveys speech. Water flowing from it indicates the removal of worry and relief.
Source: Ta'tir al-Anam fi Ta'bir al-Manam (Al-Nabulsi)
The gutter indicates a gossiping man. Whoever sees water flowing from it will hear good words.
Source: Al-Isharat fi Ilm al-Ibarat (Ibn Shahin)
The gutter is interpreted as a servant. If it is new, he is a trustworthy servant. If it is old, he is treacherous.