Writers : Behniafar,Aboulfazl; Qanbarzadeh, Hadi
Refference : The first international applied geological congress; Department of geology Islamic azad university- Mashhad
Publishing Year : 2010

Abstract :

Karst zones in north of Mashhad provins witch are Mesozoic Karsts, have specific importance in provision of water for the city of Mashhad.
Currently, by utilizing of Live water wells in karst formation of kharkat-kardeh basin (547.10 km2) and also stored water behind kardeh Dam (about 46km north of Mashhad), part of drinking water of Mashhad.
Will be provided. Hydrologic system of karst has a high sensitivity to pollutants. Thus, various factors including burying of garbages in singholes and karst shafts, entrance of wast water and sewages to hydrologic system of springs and karst rivers, entrance of wast water containing chemical fertilizers and poisons (pesticides and herbicides), and also environmental hazards resulting from tourism in this region, have caused the pollution of ground water and surface water resources.
The purpose of this paper is recognition of effective factors on pollution of karst areas of kharkat-kardeh Basin, in eastern part of kopeh-Dagh zone. (Northeast of Iran). Five percent of the drinking water of Mashhad in north-west of the city is provided by water resources of karst of kardeh Basin.
In summer, due to increase of concentration of the pollutants and environmental problems, transfer of water from kardeh Dam to Mashhad is blocked and odor and taste of the water change entirely. Because of transfer of pollutants to water reservoir of the dam.
Usage of GIS techniques and Field operations especially in karsts of northern and central parts of the basin, and also execution of several experiments, the effective factors of pollution of the water resources of the karst in the region, have been recognized. Generally, %80 of drinking water which is necessary for rural residents and suburbs of kardeh basin is provided by karst water resources and %20 by the rivers. There fore, the entrance of pollutants to limestone aquifers and karst drainage system in this area can have an direct effect on consumers, health.

Subject List : Karst