Spanish to English translations [PRO] Geography / waterways, hydrology
Spanish term or phrase:caudal de llamada
Talking about fish ladders
se analizará la cantidad y calidad físico-química del agua circulante por dichas escalas y por el aliviadero del “caudal de llamada” durante el periodo de estiaje. Se determinará la altura libre desde la última artesa aguas abajo del azud y la lámina libre en aguas bajas. De este modo se podrán detectar y cuantificar las deficiencias constructivas de algunas escalas para proceder a su corrección
Thanks everyone, although they both seem to be correct and used, attraction flow does appear to be more common. 4 KudoZ points were awarded for this answer
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Explanation: Ver los siguientes links:
‘attractant flow’, which is an area at the base of the fishway in which water flow has been modified to attract fish, and direct them... http://www.mdbc.gov.au/__data/page/65/A4Fishway.pdf
The translation workplace 
peer agreement (net): +3
