How much water does the river parana contain

I could not find an average volume IN the river, but did find an average discharge. Britannica (http://wzus.ask.com/r?t=p&d=us&s=a&c=a&l=dir&o=0&sv=0a30050e&ip=463c0683&id=755AC6F1A702FFEF4586D608DDAB00C0&q=what+is+the+volume+of+water+in+the+parana+river% 3F&p=1&qs=0&ac=6&g=10f1m7f292Sf85&en=te&io=9&ep=&eo=&b=alg&bc=&br=&tp=d&ec=10&pt=Parana%20River%20--%26nbsp%3B%20Britannica%20Concise%20Encyclopedia%2 6nbsp%3B-%20The%20online%20...&ex=&url=&u=http://www.britannica.com/ebc/article-9058413) says
"The volume of the lower Paraná River is dependent on the amount of water that it receives from the Paraguay River, which provides about 25 percent of the total; the Paraná's annual average discharge is 610,700 cubic feet per second (17,293 cubic metres per second)."

By volume it's the 2nd largest river in the world.