A watershed of size 50 square miles receives an average annual rainfall of 60 inches. Runoff amount which is assumed to be about 55% of rainfall is guided to a reservoir. The reservoir storage is proposed to be used to satisfy 70 MGD demand for a town of 20,000 populations with minimum in-stream flow requirement of 0.5 ft3 /s. Determine if the town needs to look for other sources of water to meets its water supply demand. [Note: it is a reservoir water balance problem]

Google started as one of many internet search engines, amazon started as an online book seller, and ebay began as a site where people could sell used personal items in auctions. these firms have grown to be so large and dominant that they are facing antitrust scrutiny from competition regulators in the us and elsewhere. did these online giants grow by fairly beating competition, or did they use unfair advantages? are there any clouds on the horizon for these firms -- could they face diseconomies of scale or diseconomies of scope as they continue to grow? if so, what factors may limit their continued growth?