PRESIHAJOCA JEZERA NA PIVSKEM 3 – PETELINJSKO JEZERO
INTERMITTENT LAKES IN THE PIVKA BASIN 3 – PETELINJSKO JEZERO
V pivski kotlini se nahaja 18 obicajno pojavljajocih se jezer. Proti severozahodu si sledijo Sembijsko jezero, Kalsko jezero, Laneno jezero, Backo jezero, Kljunov ribnik, Veliki dol (za Kalcem), Veliko in Malo Zagorsko jezero, Veliko in Malo Drskovsko jezero, Parsko jezero, Radohovsko jezero, Klenski dol, Palsko jezero, Petelinjsko jezero, Krajnikov dol in Jeredovce.
There are as many as 18 regular lakes in the Pivka basin. Towards the northwest the following lakes occur: Sembijsko jezero, Kalsko jezero, Laneno jezero, Backo jezero, Kljunov ribnik, Veliki dol (za Kalcem), Malo Zagorsko jezero, Veliko Zagorsko jezero, Veliko Drskovsko jezero, Malo Drskovsko jezero, Parsko jezero, Radohovsko jezero, Klenski dol, Palsko jezero, Petelinjsko jezero, Krajnikov dol and Jeredovce.
Ob vznozju Okrogleka, podaljsanega hrbta Sv. Trojice (Javorniki), lezi v ovalni globeli Petelinjsko jezero, z dnom na nadmorski visini 532 m. To jezero je najbolj obstojno, saj se voda v njem zadrzuje tudi do pol leta (Habic 1975). S povrsino okrog 700000 m2 zaostaja le za Palskim jezerom. Voda privre na povrsje v talnih izvirih na juznem delu jezera, ponikne pa skozi prepustna tla na juznem in na severnem koncu. Od tod se voda pretaka v Zejske izvire in po kratkem povrsinskem toku doseze Pivko. Ko se Petelinjsko jezero osusi, presahnejo tudi Zejski izviri.
Kljub temu da so novembra 2000 izjemne padavine povzrocile porast vodostajev skoraj v vseh 17 jezerih v dolini Pivke, je v najnizje lezecem Petelinjskem jezeru najvisji vodostaj kar za 4 m zaostal za srednjim. To daje slutiti, da je podatek o srednjem vodostaju oznacenem na TTN 1:5000 (545 m) previsok. Tudi Habic (1975) navaja, da je ta višina Petelinjskega jezera le redko dosezena.
At the end of Okroglek, the extended ridge of Sv. Trojica (the Javorniki plateau) lies an ovalshaped depression called Petelijnsko jezero, with its bottom at an altitude of 532 m. This lake is the most long-lasting of all lakes in the Pivka valley and remains for up to six months (Habic 1975). With its surface area of about 700000 m2, it is the second largest lake after Palsko jezero. The water bursts to the surface from springs located at the bottom of the southern part of the depression, and sinks mainly through sinkholes in the northern part. From there it runs towards the Zeje karst springs and onwards to the Pivka river. When Petelinjsko jezero dries out, the Zeje karst springs also run dry.
While in November 2000 heavy precipitation caused an increase in the water level of almost all the 17 lakes in the Pivka valley, the water level of Petelinjsko jezero was 4 m below the stated average. From this it can be concluded that the data on the mean water level as shown on the BTM 1:5000. (545 m asl) is overestimated. Habic (1975) also mentions that the lake only rarely reaches this elevation.
Vir / source: Gregor Kovacic & Spela Habic, Kraska presihajoca jezera Pivke (JZ Slovenija) ob visokih vodah novembra 2000 Intermittent karst lakes of Pivka basin (SW Slovenia) during high waters in november 2000, Acta carsologica, 34/3, 5, 619-649, Ljubljana, 2005