The main water artery of Partizansk is the Partizanskaya (Partizan) (or Suchan) river with many small rivers and springs flowing into it. It starts in the southern spurs of the Przhevalsky (or Sikhotae-Alin) mountain range, and flows into the Nakhodka Bay of the Sea of Japan. The river's length is 137 km (85 miles), the reservoir area is more than 4,300 km2 (1,660 sq miles), the flow velocity is from 360 m/h (1,181 ft/h) to 18 km/h (11 mph), or 1-2 m/s (3-7 ft/s) on average.
Due to the large amount of waterflows river's basin has very partitioned landscape. There are many watershed eminences, ranges, river and spring valleys, and ravines. Diversity of rocks and abundance of summer rains favor the devepopment of erosion processes. Slopes formed with volcanic rocks are steeper than the ones formed with sedimentary rocks.
The largest tributaries of the Partizanskaya (Partisan) river are the Malaya Tigrovaya (Small Tiger) river, the Bolshaya Tigrovaya (Large Tiger) river, the Melniki River, the Sobolinaya (Sable) river. The Bolshaya Tigrovaya (Large Tiger) river's length is 50 km (31 miles) with its valley expanding up to 2 km (1.2 miles) at the place of its flowing into the Partizanskaya (Partisan) river.
During the heavy showers in July and August a significant rise of water level in rivers occur. Floods inflict great damage to agriculture and transport ways. During this time inflow of surface waters into mines through the holes above the depleted coal beds increases. During the floods most of the Partizanskaya (Partisan) river valley is inundated, especially at the place where the Belaya (White) river flows into it. In winter and during droughts rivers grow very shallow, some of them even dry up.
The Partizanskaya (Partisan) river is the main source of water-supply for houshold and industrial needs of the town and nearby settlements. In order to improve it hydrogeologists are constantly prospecting underground water reserves. A significant underground water reserve was discovered in the area of Lozovy (Vine) settlement. After a new reservoir has been being built the water-supply of fresh drinking water in Partizansk will improve greatly.
The Tyoploye (Warm) Lake is situated in Lozovoye settlement 7 km (4.3 miles) away from Partizansk. It is an artificial reservoir used as a cooler for the electric power station. The lake is periodically being cleaned from silt.
The lake's length is about 2,000 m (6,560 feet), its width is 500 m (1,640 feet), and its depth is 10-12 m (33-39 feet). From one side it is enclosed with forested hills, from the other side a residential block is located. On the lake's shore there are a recreational children camp and a rowing base of the "Olimpiysky" (Olympic) sports complex. Further (along the Lozovy Klyuch (Vine Spring) and its tributaries) the "Lazurny" (Azure) hothouse enterprise and a psychoneurosis boarding school are located.
On the lake's bottom two kinds of soil prevail - stone-sandy and stony. The shore soil is stony. Water worked out from the electric station is warm, turbid, and odorless.
The Tyoploye (Warm) Lake has clear boundaries and is inhabited with plants and animals forming a unified ecological system. The following plants grow on the lake's shore: тростник обыкновенный, рогоз широколистный, стрелолист обыкновенный, осока пузырчатая. On the shallow water duckweed grows. In the deep part of the lake рдест курчавы and элодея канадская grow. Also here are good conditions for plankton, бентос, and phytophile fauna development.
The best living conditions are in the coastal area, which is better lit, warmed, and richer in oxygen. Here fish (секамбра, gudgeon, гальян) feeds and spawns. Larger species (wild carp, sheat-fish, crucian, верхогляд) live in the open water area. The lake's bottom is inhabited with freshwater molluscs, беззубки, snail-физы. On the air-water boundary water bugs, dragon-flies, and moscitoes live.
Every fall migratory ducks settle on the lake. Some flocks of teals migrating from Siberia to China and Japan and large gray ducks stay here. The lake does not freeze and there is enough forage for birds. In April ducks fly away.
It is very important to support normal water regime in the lake and keep it clean since industrial and houshold sewage waters get into it. This is done with the help of refinery system of the Partizanskaya hydro-electric power station.
The Tyoploye (Warm) Lake is a favorite recreational place of the Lozovoye (Vine) and Partizansk inhabitans. A famous "Gornyye Klyuchi" (Mountain Springs)tourist center existed here before. Before 1996 there was a station for carp fish species (wild carps, carps, crucians) cultivation. Today the power station does not have it any more.