Pipes in your system will have a C-Factor to help determine this loss. This is a measure of the roughness of the interior of the pipe that creates this friction. Different types of piping will have a different C-Factor, and the higher the C-Factor, the smoother the pipe.
A motif is a literary term that is an idea, object, or concept that repeats itself throughout a text. A motif gives clues to theme or reinforces ideas an author wants to emphasize. A motif generally reinforces the theme of the text. A motif must be repeated throughout a text to be considered a motif.
motif: A recurrent image, word, phrase, represented object or action that tends to unify the literary work or that may be elaborated into a more general theme. Also, a situation, incident, idea, image, or character type that is found in many different literary works, folktales, or myths.