How to Say "stream" in Spanish
The most common Spanish word for “stream” is “arroyo” — use 'arroyo' for a small, natural stream of water, like one you might walk beside..
arroyo
/ah-RO-yo//aˈroʝo/

Examples
Fuimos a caminar por la orilla del arroyo.
We went for a walk along the bank of the stream.
El agua del arroyo es muy clara y fresca.
The water in the brook is very clear and cool.
Después de la tormenta, el arroyo de la calle se inundó.
After the storm, the street gutter flooded.
Masculine Nouns in -o
Since this word ends in -o, it is masculine. You should use 'el' or 'un' with it: 'el arroyo'.
Arroyo vs. Río
Mistake: “Using 'río' for every body of flowing water.”
Correction: Use 'arroyo' for small, shallow streams. Use 'río' for larger rivers like the Nile or the Amazon.
flujo
FLOO-hoh/ˈflu.xo/

Examples
El flujo de tráfico se detuvo por el accidente.
The flow of traffic stopped because of the accident.
Hay un buen flujo de información entre los departamentos.
There is a good flow of information between the departments.
Revisa el flujo de la corriente eléctrica.
Check the flow of the electrical current.
Always Masculine
Remember that 'flujo' is always a masculine noun, so you must use 'el' (the) and masculine adjectives with it.
Confusing with 'fluido'
Mistake: “El fluido de agua (The fluid of water)”
Correction: El flujo de agua (The flow of water). 'Fluido' means 'fluid' (the substance), while 'flujo' means 'flow' (the movement).
curso
KOOR-soh/ˈkuɾso/

Examples
El curso del río se desvió por la sequía.
The flow/course of the river was diverted due to the drought.
Hay que dejar que los acontecimientos sigan su curso natural.
We must let events follow their natural course.
Arroyo vs. Curso
Related Translations
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