Answer to Question 1
The dam would be indivisible since it must be a certain size in order to be effective. Once flood control is provided, new homes can be protected at no additional cost. Any one home's protection does not reduce the protection from flooding for any other home. It would be impossible to exclude someone from the benefits of the flood control, so flood control arguably is a public good.
Answer to Question 2
In a monopolistically competitive industry, products sold by firms are differentiated or at least perceived to be different by consumers. Other things being equal, product differentiation can result in more profits. Firms can therefore increase their monopoly power and thus profits by differentiating their own products from those of other firms.
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