ZONATION OF HYGIENIC SURROUNDING OF TAP WELLS OF MASHHAD

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VALIZADE A.; AFSHIN S.; DANESH SH.

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Title

ZONATION OF HYGIENIC SURROUNDING OF TAP WELLS OF MASHHAD

Author(s)

VALIZADE A. | AFSHIN S. | DANESH SH. | Issue Writer Certificate

Keywords

CAPTURE ZONEQ3

GROUND WATERQ1

MATHEMATICAL MODELQ2

MICRO ORGANISM TRANSFERQ3

Abstract

The city of Mashhad will carry a population of nearly three million people and its annual water requirement will be nearly 300 million cubic meters. Concerning the role of underground water resources in the supplying drinking water protection of wells inside the urban area is an inevitable subject. Therefore a comprehensive planning and management of water resources for the protection of drinking water wells against the danger of contamination is an urgent issue. One of the important factors in this kind of planning is the determination and the observation of hygienic surrounding of drinking water wells. The hygienic CAPTURE ZONE of a well is the area around it which should be far enough from the well to the extend that if there is a little contaminated piece within the area, it should be eradicated in its path toward the drinking water well in a period of 50 days and create no danger of contamination for the water of that area. Therefore, in order for the drinking water well to be without microbial pollution, there should be a proper distance between the polluting resource and that water well. Since a remarkable number of Mashhad drinking water wells are located inside the urban area, determination and improved and precise calculation of water well surroundings should be performed based on the scientific basis, because the assessment and the execution of smaller surroundings will increase the danger of water well contamination and a larger surrounding for the water well will entail the waste of asset. For the assessment of hygienic surrounding of 174 drinking water wells of Mashhad, the MATHEMATICAL MODEL of microorganism transfer which is one of the methods of numerical calculations of biological surrounding of a well has been used in this research. After determination of hydrodynamic coefficient of water table for each one of 174 mentioned water wells, the coordinate lines of reaching the contamination to the water wells has been determined and drown by the Kinzelbach model in the Visual Basic program, afterwards the obtained distances for each water well have been calculated and finally the hygienic surrounding of the drinking water wells of the city of Mashhad have been zoned by Surfer and Arcview software. The results of this survey indicate that drinking water wells of Mashhad because of the difference in the particulars of their water table have different hygienic surroundings in different areas of the city. The variation of which is between 270 to 350 meters. To the extend that in the central areas of the city (the areas of the Holy Shrine toward Shohada and RahAhan Sq.) the hygienic surrounding of the water wells is between 270 to 290 meters and moving toward the north western part of the city of Mashhad, this surrounding increases to 320 to 350 meters, therefore the hygienic surrounding decreases from west and north-west part of the city of Mashhad toward the Eastern part of it.

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APA: Copy

VALIZADE, A., AFSHIN, S., & DANESH, SH.. (2009). ZONATION OF HYGIENIC SURROUNDING OF TAP WELLS OF MASHHAD. GEOGRAPHICAL RESEARCH, 24(1 (92)), 109-128. SID. https://sid.ir/paper/30013/en

Vancouver: Copy

VALIZADE A., AFSHIN S., DANESH SH.. ZONATION OF HYGIENIC SURROUNDING OF TAP WELLS OF MASHHAD. GEOGRAPHICAL RESEARCH[Internet]. 2009;24(1 (92)):109-128. Available from: https://sid.ir/paper/30013/en

IEEE: Copy

A. VALIZADE, S. AFSHIN, and SH. DANESH, “ZONATION OF HYGIENIC SURROUNDING OF TAP WELLS OF MASHHAD,” GEOGRAPHICAL RESEARCH, vol. 24, no. 1 (92), pp. 109–128, 2009, [Online]. Available: https://sid.ir/paper/30013/en

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