"S. R. Rao notes: The Harappans were a highly disciplined people conscious of their civic duties, which explains the meticulous care taken to keep the cities clean. No encroachment of streets is seen tor over 500 years at Lothal in spite of the fact that the houses had to be rebuilt several times after the havoc wrought by floods…. The story of the rise and decline of the Indus Civilization is an epitome of man’s struggle for Conquering nature and building an integrated peace-loving and prosperous society. In this struggle the Harappans ’seem to have succeeded to a large extent."