Vitr. 1.4.12 (mg)

But marshes that are stagnant and have no outlets either by rivers or ditches, like the Pomptine marshes, merely putrefy as they stand, emitting heavy, unhealthy vapours. A case of a town built in such a spot was Old Salpia in Apulia, founded by Diomede on his way back from Troy, or, according to some writers, by Elpias of Rhodes. Year after year there was sickness, until finally the suffering inhabitants came with a public petition to Marcus Hostilius and got him to agree to seek and find them a proper place to which to remove their city. Without delay he made the most skilful investigations, and at once purchased an estate near the sea in a healthy place, and asked the Senate and Roman people for permission to remove the town. He constructed the walls and laid out the house lots, granting one to each citizen for a mere trifle. This done, he cut an opening from a lake into the sea, and thus made of the lake a harbour for the town. The result is that now the people of Salpia live on a healthy site and at a distance of only four miles from the old town.

Hdt. 2.99.1 (mcly)

Hitherto my own observation and judgment and inquiry are the vouchers for that which I have said; but from this point onwards I am about to tell the history of Egypt according to that which I heard, to which will be added also something of that which I have myself seen.

Of Min, who first became king of Egypt, the priests said that on the one hand he banked off the site of Memphis from the river: for the whole stream of the river used to flow along by the sandy mountain-range on the side of Libya, but Min formed by embankments that bend of the river which lies to the South about a hundred furlongs above Memphis, and thus he dried up the old stream and conducted the river so that it flowed in the middle between the mountains: and even now this bend of the Nile is by the Persians kept under very careful watch, that it may flow in the channel to which it is confined,[83] and the bank is repaired every year; for if the river should break through and overflow in this direction, Memphis would be in danger of being overwhelmed by flood. When this Min, who first became king, had made into dry land the part which was dammed off, on the one hand, I say, he founded in it that city which is now called Memphis; for Memphis too is in the narrow part of Egypt;[84] and outside the city he dug round it on the North and West a lake communicating with the river, for the side towards the East is barred by the Nile itself. Then secondly he established in the city the temple of Hephaistos a great work and most worthy of mention.