The excessive moisture in wet seasons in however hostile to cereal crops, especially in the southern and western districts, though improved drainage has done something to mitigate this evil, and might do a great deal more.
If it allows of too free drainage drought sets in and the plants, not getting enough water for their needs, become stunted in size.
Those of the Paraguay drain the south-western part of Matto Grosso, and the tributaries of the Parana cover the western slopes of the Serra do Mar from Rio Grande do Sul north to the south-west part of Minas Geraes, and include the south-east part of Matto Grosso and the south part of Goyaz within their drainage basin.
The chief objects for which the city debt was created were in 1907, in millions of dollars: highways, 24.07, parks, 16.29, drainage and sewers, 15.05, rapid transit, 13.57 and water-works, 4.53.
In the extreme north-east corner of the republic where the Brazilian Guiana plateau slopes toward the Atlantic there is a small area lying outside the drainage basin of the Amazon.
These draining ditches all have their issue in a main drainage canal, along which the transport of the peat and peatlitter takes place and the houses of the colonists are built.
Between the Takht Mountain and the Siwaliks, the intervening belt of ridge and furrow has been greatly denuded by transverse drainage - a system of drainage which we now know to have existed before the formation of the hills, and to have continued to cut through them as they gradually rose above the plain level.
Only in a few isolated cases has any contamination been traced to fever or other zymotic germs. In this connexion it is worth noting that the infectious diseases hospital has a separate system of drainage which is carefully disinfected, and not allowed to be employed for the purposes of manure.
The Delaware river, from its junction with the Neversink Creek to the capes, flows along the western and southern borders of the state for a distance of 245 m., and has a total drainage area in New Jersey of 2345 sq.
The present course of the Upper Allegheny river is the result of the glacier which blocked the northward drainage of the region through which it flows and turned it southward.