The Nonette is a tributary

Tributary

A tributary or affluent is a stream or river that flows into a main stem river or a lake. A tributary does not flow directly into a sea or ocean...

 to the Oise River

Oise River

The River Oise is a right tributary of the River Seine, flowing for 302 km in Belgium and France. Its source is in the Belgian province Hainaut, south of the town Chimay. It crosses the border with France after about 20 km. It flows into the Seine in Conflans-Sainte-Honorine, near Paris...

 in northern France

France

The French Republic , The French Republic , The French Republic , (commonly known as France , is a unitary semi-presidential republic in Western Europe with several overseas territories and islands located on other continents and in the Indian, Pacific, and Atlantic oceans. Metropolitan France...

. Its source is in Nanteuil-le-Haudouin

Nanteuil-le-Haudouin

Nanteuil-le-Haudouin is a town in northern France. It is designated municipally as a commune within the département of Oise.-References:*...

, from which it flows west through Senlis

Senlis, Oise

Senlis is a French commune located in the Oise department near Paris. It has a long and rich heritage, having traversed centuries of history. This medieval town has welcomed some of the most renowned figures in French history, including Hugh Capet, Louis IX, the Marshall of France, Anne of Kiev and...

 and Chantilly

Chantilly, Oise

Chantilly is a small city in northern France. It is designated municipally as a commune in the department of Oise.It is in the metropolitan area of Paris 38.4 km...

, and joins the Oise in Gouvieux

Gouvieux

Gouvieux is a town in northern France. It is designated municipally as a commune within the département of Oise.-Geography:The commune is served by the train station of Chantilly-Gouvieux on the RER D line or the TER from the Parisian Gare du Nord station. The town is located in the Chantilly...

.

The river has relatively high turbidity

Turbidity

Turbidity is the cloudiness or haziness of a fluid caused by individual particles that are generally invisible to the naked eye, similar to smoke in air. The measurement of turbidity is a key test of water quality....

 and its brownish water has a modest in velocity due to the slight gradient of the watercourse; pH

PH

In chemistry, pH is a measure of the acidity or basicity of an aqueous solution. Pure water is said to be neutral, with a pH close to 7.0 at . Solutions with a pH less than 7 are said to be acidic and solutions with a pH greater than 7 are basic or alkaline...

 levels have been measured at 9.25 or quite alkaline near the Château d'Ermenonville

Ermenonville

Ermenonville is a small village in northern France. It is designated municipally as a commune within the département of Oise.Ermenonville is notable for its park named for Jean-Jacques Rousseau by René Louis de Girardin...

 and electrical conductivity of the waters have tested at 81 micro-siemens per centimetre.