But if there was any unforeseen drop in how much water was available -- less groundwater, less stream flow, less water in the pool -- less dilution would take place, and things would get more toxic.
Pero si hubiera una disminución imprevista en la cantidad de agua disponible, menos agua subterránea, menos caudal, menos agua en la piscina, observaríamos una menor dilución, y una mayor toxicidad.