Abstract
Agriculture played a significant role in the economic prosperity and development during the Sassanid era. The Sassanid facilitated economic, social, and political growth by constructing water structures tailored to the environmental landscape of the region and establishing laws for water utilization. The presence of perennial rivers like the Dez and Karkheh in Khuzestan created conditions not only to supply the water needs of local settlements but also to address the shortage of drinking, industrial, and agricultural water in other areas distant from rivers that had fertile soil. This was achieved through the construction of structures such as weirs, canals, Qanats, and other water facilities. Specifically, the water supply for the city and agricultural lands of Gondishapur, located 15 kilometers from the Dez River, was accomplished through various water bodies; among these, river Qanats played a fundamental role in transferring reliable water from the Dez River to the city and its farmlands. Archaeological field studies conducted by the authors have led to the identification of new water structures, including weirs, Qanats, and related canals, which had previously been recognized only in part. A considerable portion of these structures is located on the eastern side of the Dez River, and some extend near Gondishapur, suggesting the hypothesis that river Qanats were the main source of water supply for this city-a notion traceable in historical writings. The primary question of this research is how the permanent water required by the city of Gondishapur was supplied, what role the river Qanats played, and what the physical relationship between the Qanats and the city was. The methodology of this research is historical-analytical, and the information gathering is based on field data and historical sources. Satellite imagery analysis indicates the prominent role of Qanats utilization in transferring water to Gondishapur from the Dez River during the Sassanid period, although some of the Dezful Qanats can be attributed to a later period, even the Safavid era.
Keywords: Aqueduct - Canal, Sater Structure, Dez River, Gondishapur, Dezful, Sasanian.

Introduction
Water, as a vital element, has played a central role in the development of civilizations. In Iran, a country with water limitations, this issue has gained double significance, and water engineering has been recognized as one of the most prominent aspects of Iranian technology and skill from ancient times to the present. The Qanats, one of the most astonishing achievements of water engineering in Iran, is regarded not only as a solution for managing scarce water resources but also as a valuable cultural symbol. These irrigation systems, some of which extend over a hundred kilometers, are renowned not only in Iran but also worldwide.
In this text, the author examines the engineering system and exploitation of underground waters in Dezful and its connection with the water supply of the city of Gondishapur and its surrounding lands. It is emphasized that a more accurate understanding of these systems can contribute to a better comprehension of the subsistence economy and economic development during the Sassanid and Islamic periods. Furthermore, analytical-comparative studies can demonstrate the level of creativity and the impact of these systems on the life of the city of Gondishapur.
The author has used descriptive-analytical methods and tools such as remote sensing, aerial and satellite imagery, maps, and digital elevation models to analyze the data. This research seeks to answer questions about the role of river Qanats in providing drinking, agricultural, and industrial water for the city of Gondishapur and how the technology and construction methods of these Qanats were.
The research hypotheses state that the water needed for the city of Gondishapur was supplied through the construction of weirs, Qanats chains, and open canals from the Dez River. Tangible evidence such as the Dezful weir, river Qanats, open canals, the siphon bridge of the Siyah-Mansur River, and the city’s piping with ceramic pipes are presented as examples of this technology.
This research not only assesses the historical and archaeological aspects of these systems but also pays attention to their importance in sustainable development and the preservation of cultural heritage. Ultimately, this study can serve as an important resource for researchers interested in the history and technology of water in Iran.

Discussion
The central question of the current research is how the perennial water supply needed by the city of Gondishapur was secured, what role the River Qanats played in this, and what the physical relationship between the Qanats and the city was like. The methodology of this research is historical-analytical, and the information gathering is based on field data and historical sources. Therefore, the forthcoming article examines and analyzes the engineering system and exploitation of underground waters in Dezful and how it relates to the water supply of the city of Gondishapur and its surrounding lands. It specifically seeks to answer the following questions: Based on historical and archaeological documents, how are the River Qanats evaluated in terms of providing drinking, agricultural, and industrial water for the city of Gondishapur? And what was the technology and construction method of the River Qanats of Dezful and their various components? Following these questions, the hypotheses of this research have been organized as follows: The water needed by the city of Gondishapur was supplied through the construction of weirs, Qanats chains, and open canals from the Dez River as a permanent water source. This action has been evidenced by the construction of the Dezful weir, river Qanats, open canals, the siphon bridge of the Siyah-Mansur River, and the city’s piping with ceramic pipes as tangible proofs of water transfer to the city of Gondishapur.

Conclusion
Field research and analysis of Corona aerial imagery have revealed numerous water structures in the northern, western, eastern, and southern areas surrounding Dezful. Among these, the Qanats located on the eastern bank of the Dez River hold particular significance due to their direct relevance to this study. For instance, no traces of Qanats are identifiable in the Yaqub-e Leyth region in the 1968 Corona images, yet two Qanats shafts were discovered during field investigations. A primary deficiency in the initial plan was the failure to identify the Qanats chains in the Benuarshami area. Following the discovery of ancient Qanats and canals, research began on their history, indicating that some Dezful Qanats, such as Qamish-e Momenun, might date back to the Safavid era. It appears that parts of these Qanats, ancient canals, and water structures supplying the city of Gondishapur were constructed at least in the latter half of the Sassanid period, or it cannot be said that all Dezful Qanats branches belong to a specific era.
It seems that in the first half of the Sassanid period, open earthen canals were responsible for supplying water to Gondishapur, and in the latter half, the introduction of new crops such as rice and sugarcane increased water demand, rendering the canals connected to the Dez River insufficient. This situation partly justifies the creation of Qanats. After the abandonment of the city in the 7th or 8th century AH, it is likely that the water supply structures of Gondishapur became ineffective. Consequently, the Qanats, whose water discharge was recorded until 1966 AD, transferred water to the western lands of Gondishapur or directed it downstream via the Siyah Mansur River.

Abstract
India, with its very cultural and religious diversity, underwent changes and transformations with the domination of the Mamluk government. The minaret as one of the elements of Islamic architecture, apart from playing the role of the minaret, was a symbol of Islamic rule. The minaret is a lasting symbol of the rich history of India, architectural skills and cultural exchange. The purpose of this research is the analysis of decorative elements and re-reading the inscriptions of “Minaret Qutub”, by answering these questions, what effect did the decorative elements of Islamic architecture have on this building? And what are the themes of the inscriptions? The research method of this research is based on library studies, study of first-hand sources, field studies and objective observations of the author and has been done by describing, analyzing and using historical sources. The results of this study show that the minaret is decorated under the influence of aesthetics and elements of Islamic architecture, and the decorative elements of the Qutub minaret are a combination of Islamic and Indian elements. Although the minaret follows the general form of Islamic minarets, it contains elements of Indian architecture such as precise and complex carvings, the use of sand, red stone and marble, the use of lotus flowers and bell-shaped decorations, various inscriptions, geometric and plant motifs that It reflects the combined nature of Indian and Islamic architecture, and the title “Indo-Islamic” architecture can be used for the art of the Mamluk period.
Keywords: Decorative Elements, Inscriptions, Islamic Architecture, Indian Architecture, Mamluk, Qutub Minaret.

Introduction
The Qutub in Delhi is a notable example of Islamic architecture, but it also incorporates elements of Indian design. The use of intricate stone carving techniques, geometric patterns, and calligraphic inscriptions is prominent in this period. This assimilation of diverse influences and the development of a unique artistic style continued to flourish in the following centuries.
In 588 AH, Mu’izzuddin Muhammad Ghori succeeded in capturing the city of Delhi and, while there was no heir to Muhammad Ghori, appointed Qutbuddin Aybak as the successor to the Ghorid government there. He established the Mamluk rule in Delhi and established the first Islamic state called the “Delhi Sultanate”. The Mamluk sultans, who were originally from Central Asia and Iran, brought with them a rich architectural tradition that combined elements of Iranian, Islamic and Indian styles. This fusion led to the development of unique architectural features such as the use of arches, domes, minarets and intricate decorative motifs.
The Qutub Minaret in Delhi is a notable example of Islamic architecture but also incorporates elements of Indian design. The use of intricate stone carving techniques, geometric patterns and calligraphic inscriptions were prominent during this period.
The purpose of this research is to analyze the decorative elements and reinterpret the inscriptions of the “Minaret of Qutub”, in order to answer the questions, what effects did the decorative elements of Islamic architectural art have on this building? And what topics do the themes of the inscriptions express? 
This research seeks to understand the themes of the inscriptions by rereading the inscriptions, the inscriptions of this building have been objectively observed and rewritten, while explaining the concepts of symbols and decorative elements, it aims to clarify the effects of Islamic art on the aforementioned building.
 
Discussion
The Qutub Minar is the tallest brick building in the world with a height of 72.5 meters and a diameter of about 14 at the base and about 3 meters at the highest balcony. The Qutub Minar has five floors and a spiral staircase with 379 steps. The entrance to the minaret is through a door facing north. Between each floor, a circular porch surrounds the building. This porch plays an effective role in maintaining and supporting the weight of the upper floors. Materials such as red and light brown sandstone and gray quartzite were used in the construction of this building, and its two rows are made of white marble.. Indo-Islamic structures often incorporate elements inspired by Hindu and Jain temple architecture. This approach results in a unique combination of forms, motifs and techniques.
Geometric shapes in Islamic architecture often represent the concept of unity, harmony, and precise mathematical proportions and symmetrical arrangements of patterns, the idea of balance and order in the universe, and reflect the belief in the harmonious interaction of various elements in creation.The repetition of geometric shapes with no discernible beginning or end was seen as indicative of the infinite and eternal nature of God.
The Qutub Minaret features intricate carvings, geometric patterns, and ornamental designs that are indicative of the art of its time. Its five floors are separated by carved balconies and fluted columns with Muqarnas decorations. The decorative elements used in Mamluk architecture reflect the sophisticated artistry, aesthetic appeal, and symbolic meanings associated with Islamic art and architecture. They represent a combination of mathematical precision, decorative beauty, and spiritual symbolism. The repetition of geometric shapes without a discernible beginning or end indicated the boundless and eternal nature of God.
Geometric shapes in Islamic architecture often represent the concept of unity, harmony, and precise mathematical proportions and symmetrical arrangements of patterns, the idea of balance and order in the universe, and reflect the belief in the harmonious interaction of various elements in creation.
The inscriptions on the minaret provide valuable historical information about its construction. On each floor, there are two relief inscriptions containing the names of rulers and sultans. The inscriptions on the Qutub Minaret include verses from the Holy Quran, the names and titles of rulers associated with the building, and historical information about its construction.
These inscriptions are skillfully and beautifully executed in calligraphy.
Various styles of Arabic calligraphy such as Kufic, Naskh and Thuluth can be seen on the minaret. 

Conclusion 
The influence of Islamic culture and civilization in the 6th century AH with the establishment of the Delhi Sultanate had a profound impact on the Indian subcontinent. This state, which was the beginning of Muslim rule in India, served as a political and cultural center for the spread of Islamic civilization. The influence of Islamic culture and civilization in India can be seen in various fields, and Islamic architecture in India in particular flourished from the period of the Delhi Sultanates.The architectural elements, decorations, symbols and signs common to Islamic architecture were incorporated into almost all the buildings of the Delhi Sultanate period and later became a common practice in Indian architecture. Several architectural innovations were introduced during the Delhi Sultanate period. These innovations included the construction of minarets, the use of complex stone carving techniques, geometric designs and calligraphic inscriptions, which were prominent during this period.The inscriptions on the building, which are mainly in Arabic, contain verses from the Holy Quran as well as information about the construction of the building. The oldest inscription at the base of the Qutub Minar is attributed to Qutubuddin Aibak, the founder of the Delhi Sultanate. As you ascend the minaret, the text of the inscriptions reflects later additions and renovations made by the rulers of subsequent periods.The inscriptions also display linguistic diversity, with the diversity of Arabic, Persian, Turkish and Hindi languages reflecting the multicultural nature of the Delhi Sultanate. This building is also noteworthy in terms of calligraphy styles and technical techniques of carving and decorative elements and layout, while the symbols and motifs of each one convey a specific meaning to the viewer.Another prominent feature of Indian and Islamic architecture is the use of red sandstone and marble. The use of red sandstone along with decorative elements made of marble creates a significant contrast and adds to the attractiveness of the structures.
The creation and attractiveness of the structures has added to the charm.Indian decorative motifs are often inspired by nature and the local environment. By incorporating these motifs, Indo-Islamic architecture was able to adapt itself to the local context. During the period of the Delhi Sultans, the fusion of Islamic and Indian culture led to Indo-Islamic art, which was characterized by the fusion of Persian, Turkish and Arabic elements with indigenous Indian traditions, resulting in a unique architectural style. The intricate carvings on the minaret, including lotus flower motifs and bell-shaped motifs, indicate a cultural fusion that occurred during the Delhi Sultans and highlighted the inclusive nature of Islamic art.