| Lomnice | |
| Source1 Location: | Rožmitál pod Třemšínem, Brdy Highlands |
| Mouth Location: | Otava |
| Mouth Coordinates: | 49.4072°N 14.1817°W |
| Subdivision Type1: | Country |
| Subdivision Name1: | Czech Republic |
| Subdivision Type2: | Regions |
| Length Km: | 59.3 |
| Discharge1 Avg: | 3.28m3/s near estuary |
| Basin Size Km2: | 830.7 |
The Lomnice (upstream also called Smolivecký potok and Jesec) is a river in the Czech Republic, a left tributary of the Otava River. It flows through the Central Bohemian, Plzeň and South Bohemian regions. It is 59.3km (36.8miles) long.
The adjective Czech: lomný denoted a frequently bending river, but also a stone suitable for quarrying. This could refer to the character of the river bed, which contained gold.[1]
The Lomnice originates in the territory of Rožmitál pod Třemšínem in the Brdy Highlands at an elevation of and flows to Oslov, where it enters the Otava River at an elevation of . It is 59.3km (36.8miles) long. Its drainage basin has an area of 830.7km2.[2]
The longest tributaries of the Lomnice are:[3]
| Tributary | Length (km) | Side | |
|---|---|---|---|
| 52.3 | left | ||
| Závišínský potok | 21.9 | left | |
| Kostratecký potok | 16.9 | left | |
| Jesenický potok | 16.1 | right | |
| Mračovský potok | 14.4 | right | |
| Hajanský potok | 12.0 | left | |
| Hradišťský potok | 11.1 | right |
The most important settlement on the river is the town of Blatná. The river flows through the municipal territories of Rožmitál pod Třemšínem, Hvožďany, Mladý Smolivec, Předmíř, Lnáře, Tchořovice, Blatná, Buzice, Lom, Mirotice, Smetanova Lhota, Ostrovec, Varvažov and Oslov.
The drainage basin is rich in fishponds, especially in the area of the Blatná Uplands. There are 241 bodies of water in the basin area larger than 1 ha. The largest of them is the Labuť pond with an area of, built on the Kostratecký potok. Several fishponds are built directly on the Lomnice. The large Orlík Reservoir, built on the Vltava River, extends also into the river mouth of the Otava and Lomnice.[2]
The spring and the first kilometres of the Lomnice are located within the Brdy Protected Landscape Area. The river also flows through several small-scale protected areas.
The Hořejší rybník Nature Reserve protects the area of the fishpond Hořejší rybník and its surroundings, including the mouth of the Lomnice to the pond. The nature reserve has an area of . The object of protection is a pond ecosystem with very well-preserved littoral vegetation and adjacent mesophilic meadows and waterlogged alder forests, which has high biodiversity.[4] Near Hořejší rybník is located the fishpond Dolejší rybník whose bank is protected as the Dolejší rybník Nature Reserve with an area of . It is an important site of non-forest bog vegetation.[5]
In Blatná, the river flows through the Blatná Castle park, protected as the Blatná Nature Monument with an area of . It is a site with occurrence of rare and endangered species of animals, especially the hermit beetle, which is highly endangered within the country.[6]
The Lomnice's river bed in the municipality of Smetanova Lhota is protected as the Vystrkov Nature Monument with an area of . It is a site with occurrence of rare and endangered species of plants and animals.[7] A few hundred metres further downstream, the river bed is protected as the V Obouch Nature Monument with an area of . The reasons for protection are similar to Vystrkov.[8]
In the Middle Ages, the banks of the Lomnice were popular for gold panning. The so-called Czech: sejpy (man-made mounds that are the remains of gold panning) in the castle park in Blatná are protected as a cultural monument.[9]
The Lomnice is occasionally suitable for river tourism, but only in spring and after heavy rains. About of the river is navigable.[10]