river
A river is a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea, lake or another river. In some cases, a river flows into the ground and becomes dry at the end of its course without reaching another body of wate ...
, a
tributary
A tributary, or affluent, is a stream or river that flows into a larger stream or main stem (or parent) river or a lake. A tributary does not flow directly into a sea or ocean. Tributaries and the main stem river drain the surrounding drainage ...
Loire
The Loire (, also ; ; oc, Léger, ; la, Liger) is the longest river in France and the 171st longest in the world. With a length of , it drains , more than a fifth of France's land, while its average discharge is only half that of the Rhône ...
.
Geography
The river spring is located at Perche-Gouët, Béthonvilliers at 222 m high at le Burail locality in le Bois de Beaumont.
2 offshoots: la Suzanne ou Sainte-Suzanne et l'Ozanne de Dampierre ou Moranne ou Mozanne which join near
Brou
Brou may refer to:
* Brou, Eure-et-Loir, a village and ''commune'' in France
* Brou-sur-Chantereine, a village and ''commune'' in Seine-et-Marne, France
* Brou people, a Khmer Loeu ethnic group in Cambodia
See also
* Royal Monastery of Brou, in B ...
.
It flows into le Loir, right bank, 1 km north of Bonneval at 129 m high at Ouzenain (locality).
Tributaries
The Ozanne has 7 official affluents (14 including sub-affluents) :
* ?(source secondaire), (rg), 3 km, sur les deux communes de Vicheres et Beaumont-les-Autels.
* ?, (rg), 0.9 km, sur les deux communes de
Miermaigne
Miermaigne () is a commune in the Eure-et-Loir department in northern France.
Population
See also
*Communes of the Eure-et-Loir department
The following is a list of the 365 communes of the Eure-et-Loir department of France.
The communes ...
et Beaumont-les-Autels.
* sept bras de l'Ozanne, pour un total de 8.3 km sur les six communes de
Unverre
Unverre () is a commune in the Eure-et-Loir department in northern France.
Population
See also
*Communes of the Eure-et-Loir department
The following is a list of the 365 communes of the Eure-et-Loir department of France.
The communes co ...
,
Brou
Brou may refer to:
* Brou, Eure-et-Loir, a village and ''commune'' in France
* Brou-sur-Chantereine, a village and ''commune'' in Seine-et-Marne, France
* Brou people, a Khmer Loeu ethnic group in Cambodia
See also
* Royal Monastery of Brou, in B ...
Dangeau
Dangeau () is a commune in the Eure-et-Loir department in northern France. On 1 January 2018, the former communes of Bullou and Mézières-au-Perche were merged into Dangeau.Moulhard et Luigny.
* le Sainte Suzanne, (rd), 19.2 km sur les cinq communes de
Unverre
Unverre () is a commune in the Eure-et-Loir department in northern France.
Population
See also
*Communes of the Eure-et-Loir department
The following is a list of the 365 communes of the Eure-et-Loir department of France.
The communes co ...
,
Authon-du-Perche
Authon-du-Perche (, literally ''Authon of the Perche'') is a commune in the Eure-et-Loir department in northern France. On 1 January 2019, the former commune Soizé was merged into Authon-du-Perche.Charbonnières, Beaumont-les-Autels et
Les Autels-Villevillon
Les Autels-Villevillon () is a commune in the Eure-et-Loir department in northern France.
Population
See also
*Communes of the Eure-et-Loir department
The following is a list of the 365 communes of the Eure-et-Loir department of France.
...
avec deux affluents :
** ?, 4 km ?un bras? sur Unverre.
** la Sonnette, (rd), 13.5 km sur les cinq communes de
Unverre
Unverre () is a commune in the Eure-et-Loir department in northern France.
Population
See also
*Communes of the Eure-et-Loir department
The following is a list of the 365 communes of the Eure-et-Loir department of France.
The communes co ...
Soize
Soize () is a commune in the Aisne department in Hauts-de-France in northern France.
Population
See also
*Communes of the Aisne department
The following is a list of the 799 communes in the French department of Aisne.
The communes ...
,
La Bazoche-Gouet
La Bazoche-Gouet () is a commune in the Eure-et-Loir department in northern France.
Population
See also
*Communes of the Eure-et-Loir department
The following is a list of the 365 communes of the Eure-et-Loir department of France.
The co ...
,
Les Autels-Villevillon
Les Autels-Villevillon () is a commune in the Eure-et-Loir department in northern France.
Population
See also
*Communes of the Eure-et-Loir department
The following is a list of the 365 communes of the Eure-et-Loir department of France.
...
.
* la Vallée d'Esse, (rd), 10.1 km sur les deux communes de
Unverre
Unverre () is a commune in the Eure-et-Loir department in northern France.
Population
See also
*Communes of the Eure-et-Loir department
The following is a list of the 365 communes of the Eure-et-Loir department of France.
The communes co ...
et Yèvres.
* la Vallée de Tronchet, (rd), 8.8 km sur la seule commune de Yèvres.
* la vallée de Montparentière, (rg), 3.1 km sur la seule commune de Yèvres.
* la vallée des Vollars, (rd), 6.3 km sur les trois communes de Yèvres,
Dangeau
Dangeau () is a commune in the Eure-et-Loir department in northern France. On 1 January 2018, the former communes of Bullou and Mézières-au-Perche were merged into Dangeau.Gohory
Gohory () is a commune in the Eure-et-Loir department and Centre-Val de Loire region of north-central France. It lies 36 km south-west of Chartres and some 115 km from Paris.
Population
See also
*Communes of the Eure-et-Loir depar ...
.
Strahler number
In mathematics, the Strahler number or Horton–Strahler number of a mathematical tree is a numerical measure of its branching complexity.
These numbers were first developed in hydrology by and ; in this application, they are referred to as the ...
of 3
Watershed
The hydrological area of the Ozanne and its affluents is 278 km² wide, which is composed of farming land (91.52%), of forests and semi-natural areas (6.55%), artificial areas (1.76%) and damp areas (0.12%).
Hydrology
The Ozanne debit was studied from 1973 to 2014 at Prémoteux, near Trizay-lès-Bonneval at 126 m high, very close to its meeting point with the Loir. The river watershed is of 268 km² (96% of the 278 km²).
The river module at Trizay-lès-Bonneval is of 1.46 m³/s.
The river presents impotent seasonal debital fluctuations, with high waters in Winter: mean monthly debit of 2,71 and 3.61 m³/s, from December to March (peak in January) and low waters in Summer, end of May to beginning of October, with a mean monthly debit drop of up to 0.235 m³ in August (235 L/s).
Low waters
However, the 3-day low-water volume can drop to a severe 0.044 m³ during a dry five-year period (or 44 L/s).
Floods
Floods can also be important.
The maximal debit recorded was 65.2 m³/s on January 22, 1995, while the maximal daily worth was of 52.6 m³/s on April 10, 1983, which is expected to happen every 10 to 15 years on average. The maximal height was of 1920 mm (or 1.92 m) on January 14, 2004.
Water slide and debit
The yearly
precipitation
In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravitational pull from clouds. The main forms of precipitation include drizzle, rain, sleet, snow, ice pellets, graupel and hail. ...
in the Ozanne basin is of a modest 173 mm, far below the national average, but also to that of la Loire (244 mm yearly), closer to its neighboring river Yerre (176 mm), with an average debit of 5.5 L/s and km².
Mill localities
Géoportail records 11 "mill" localities : le moulin de Vinet, le moulin de l'Orme, le moulin Foulon, le moulin Vieux et un gué, le moulin Brière, le moulin de Forçonnerie, le moulin d'Epasses, le moulin de Georges, le moulin de la Varenne, le moulin de Patry, un gué, le moulin de Frécot.
ZNIEFF
The river Ozanne marks the northern limit of a little ZNIEFF Chenaie-charmaie de la Poupelière.