Apology accepted. I think what you are referring to, is that the San Juan can drop very rapidly when the weather gets hot and dry. I do my best to anticipate it (using forecasts, etc), but between the weather, NM irrigators (who can take a little more than they are suppose to and quickly) and natural losses, it can result in a short period of lower flows before the extra reservoir release can get downstream and do any good. It's a tricky game in the summer months. That is why we use a 7-day moving mean as our guide.
I am pretty open to explain my thinking when it comes to reservoir operations, so feel free to give me a call if you ever want to discuss how the reservior is operated.