<l-2 THE TONER LECTURES. 



(1.) The Potomac Flats or Kidwell Bottoms, and the flats and 

 marshes along the Anaeostia, to be reclaimed after the Dutch 

 practice, by embanking and pumping. The embankment or per- 

 manent defences to be so placed as to leave the necessary channels 

 for commerce and for the safe discharge of the greatest flow of 

 water. 



(2.) The discharge of the lateral streams and of storm-water 

 sewers to be carried beyond these defences and delivered into the 

 main channels of the river, with such precautions in the case of 

 the Anaeostia as will prevent injury to the works by the rapidity 

 and volume of the flow. 



(3.) The complete under-draining or subsoil drainage of the site 

 of the city. 



(4.) The separate removal of the foul drainage. That from 

 the higher portions to be discharged by intercepting sewers into 

 the Potomac, or at a safe point for treatment by irrigation. The 

 intercepting sewers to receive the whole flow of new house-drain 

 sewers, and the dry-weather flow of such sewers as may be retained 

 for the double use of carrying surface-water and house drainage. 

 The foul drainage of the lower parts of the city to be thrown into 

 the high-level intercepting sewer by pumping. 



(5.) The abolition of privy vaults and cess-pools, and the 

 complete reformation of the interior drainage of houses. 



It will not, I am sure, be doubted that the complete execution 

 of these works would make Washington a perfectly healthy city. 

 No one who is qualified to form a judgment on the subject will 

 doubt that the entire cost of the improvement will be more than 

 ofiset by the increased value of real estate now sufiering from a 

 bad sanitary reputation, and by the value for ornamental or 

 economic purposes of the land to be reclaimed along the rivers. 



