Lake Parishan and Dasht-e- Arjan

  • Lake Parishan and  Dasht-e- Arjan Download

    The Lake is located about 15 km east of Kazeroun in a valley at the southern toe of the mountains locally known as Div kan.  It is more or less a topographical depression which forms an elongated pan in between the shallow ridges in its eastern, southern and western sides. The area is located in the semiـarid part of Iran with short mildـtemperate winters and long hot and dry summers. Precipitation regime of the area follows that of Mediterranean and major part of precipitation occurs during fall up to spring months. Summer months are generally dry. The catchment area of the Lake is about 270,000 ha. The surface area of the water body changes seasonally according to the hydrological condition and generally varies between more than 2500 ha to almost 5000 ha but historical documents show that in some severe drought periods (1987) the entire lake has dried out. The average annual precipitation of the area is around 450 mm ranging in between 700220ـ mm/yr. The evaporation capacity in the area is high (on average 2470 mm per year) and ranges in between 16003350ـ mm/yr. The Lake is recharged by different sources including ground water flows, precipitation and runoffs from surrounding areas. The geological formations in the north of the Lake are of limestone nature which is generally characterized by extensive fissures. This Karstic feature of northern limestone causes several springs to appear in the eastern and western sides of the Lake. Also, significant seepage flows directly enter the lake from the northern slopes.
    The Lake is generally a shallow water body with more or less impervious bed. When fully inundated, the depth of water in its deepest part is less than 5 meters. At low water level conditions, the depth of water in the lake is generally less than 2 meters.  The Lake does not have a natural outflow and its main source of water loss is through evaporation from water surface and consumption by vegetation cover. However large number of water wells (more than 800) have been excavated around the Lake and are exploiting significant volume of ground water for irrigation uses which otherwise would recharge the wetland

    Lake Parishan and  Dasht-e- Arjan
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