The construction of a dam old Marib phases which began in «Thousand first BC» then the evolution of the dam after that even took its final form and complete all the facilities and its banks in «the fifth century BC» in the era of Almkrb «Smhali well over bin Dhamar Ali» and carved his name on a rock right above the coincidences of the old bridge. Marib Dam has seen many renovations including: - The first restoration in «first hundred BC» in the reign of King «Yasser Ihnam» King of Sheba Odhu Redan and Hadramout and Emenp. - Second-year restoration «three hundred AD» in the reign of King «Sharan Ihnam» and his son royal distressed. - Third-year restoration «Four hundred and fifty-seven after Christmas» in the reign of King «Sharhabeel bite». - The last renovation in the era of «Abraha Ashram» A Abyssinian campaign leaders to Yemen and boarded judgment and dubbed the title of kings and is mentioned in the inscription blogger letter Missned year (557) after Christmas. The old dam Format: A height of 18 meters and a length of between about Alsdwin (700 meters), and was about Leroy (10,000 ha) of the territory of the gardens. The dam was built on the Valley (ear) between two mountains (the northern Balkans and the Balkans center), and the mountains of Balkans is a series of mountains make up the last barrier of the Eastern Heights before it meets the desert. There are valleys are in the (Valley ear) up to almost seventy Wadia. If we want to review the basic facilities for the old bridge .. can refer to: - Marib Dam himself any dam wall, which reserves the valley. - Two banks majora (Alsdvan) who graduated through them water from both sides of the dam. - Two key channels which Terbtan banks Paljntin. - Irrigation network of sub-channels that Troy villages and fields. - The gardens fields (right and north) square and rectangular forms the land of the Valley of the gardens of Sheba. Facts and figures about the old dam of Marib: Old Himyarite effects indicated that the first of the dam is built (well over Ali and his son followed the order) and in the year 700 BC, and was then called (ARMA Amerb). Has been the restoration of the dam four times as a result of major flooding, was the fourth Abraha for repair in (557) after Christmas .. reaching high old dam (18) meters and a length of 600 meters, the area of the dam lake old ( kilometers ft, while the total capacity of the basin storage of up to 55 million cubic meters, while the volume of silt downward annually into the dam lake about two and a half cubic meters, and the average momentum floods in the dam for two years, about 950 cubic meters per second and average ten years (3750) cubic meters per second, and average about a hundred years (7250) cubic meters per second. That's The energy any normal dam then not be able to accommodate those floods and Tmiha and force push, but that body any normal dam can not stand in front of more than a century for a while, so the great Marib dam has been designed and constructed strictly in durability and tighten so that serves its purpose for long centuries and so they do not Nahdi the dam and its facilities are all but broken wall every once in a century, but the refraction as (vent) to the soles of the dam filled with silt and after this explosion can remove silt by the workforce, according to available resources and available at the time. While estimated energy channels main ability together about 60 cubic meters per second, while the land that was Isageha Dam old space around (10.000) hectares, the area of land located to the right of the valley (right Paradise) is greater than land located to the left of the valley (space Paradise left), and the land was cultivated at the time enough to feed from (30.000) to (50,000) people. New Marib Dam: Was built in the era of good men investigator Yemeni unity, development and democracy President Ali Abdullah Saleh, may God protect him and the support of the United Arab Emirates, led by the late Sheikh Zayed bin Sultan Al Nahyan, may God have mercy on him where it was opened and inaugurated on Sunday, December 21, 1986 AD. - Basin new dam area (30.5) square kilometers, and a storage capacity of about 400 million cubic meters, while the discharge gate card works (35) cubic meters per second, where he tells about the dam (16.570) hectares. > The new dam, the body: - The depth of the concrete cutter (60) meters. - Square and concrete cutter (24) thousand square meters. - The length of the concrete cutter body (763) meters. - View cutter body from the surface of the concrete canyon level (337 meters). - Showing the concrete cutter body at the water outlet of the discharge gate (195) meters. The most important points concerning the process of implementing the project Marib Dam: The total size of the rubble in the body of the dam (3) million cubic meters (200) thousand cubic meters of rock from both sides of the site cover the body of the dam with rocks, which amounted been removed (100) thousand cubic meters participated in the construction of the new dam, about (400) engineer and consultant and agent and technical and administrative and others. Preliminary experiments began to run gate water outlet at the end of June 1986, after the end of the construction of the dam stage, and the volume of water flowing from the dam gate (17.530) cubic meters, was pumped at intervals with of seventeen minutes, and spread the flow of water three kilometers and five hundred distance square meters and that of country sluice gate that works to slip. And the stages of preparation, studies and implementation .. has been consulted to our country with the United Arab Emirates in the rebuilding of the Marib Dam in the early seventies and issued late Sheikh Zayed bin Sultan Al Nahyan directed to prepare a comprehensive study of the construction of the dam in the same area. The agreement with the company (Bbulenj) Engineering prepared the study and has delivered in May 1974. On September 11th of 1976, an agreement was signed between the Abu Dhabi Fund for Arab Economic Development Inc. (Ketroat Swiss) to study the economic feasibility of the gardens project which aims to build a new dam in Marib Valley Ubaidah (Valley ear). In June of 1978, the company (Ketroat Engineering Services) in collaboration with the company provided (Hunting Technical Services), a comprehensive study to the Government of our country, including the recommendation of an integrated project to build a dam new Marib, and the details of the construction plan and the economic feasibility for the project and costs. - In the twelfth of July 1984 took place in Sanaa Agreement between the Government of our country and the company (Turkish Doguc) for the construction and implementation of the new dam in Marib, which reach a total cost to about 90 million US dollars at the expense of the late Sheikh Zayed bin Sultan Al Nahyan and supervised the implementation of the new Marib Dam Project Abu Dhabi Fund for Arab Economic Development, and in the second of October 1984, the President / Ali Abdullah Saleh and His Highness the late Sheikh Zayed bin Sultan Al Nahyan, laid the foundation stone for the construction of a new dam of Marib. The new dam site and the climate of the region and the rain and the evaporation rate: - New Marib Dam is located on the plains of the province of Marib, which lies about 180 kilometers east of the capital Sanaa. - The dam is located at latitude (30.15) degrees north and longitude 30.45 east. - The dam is located 11 kilometers west of the ancient city of Marib and three kilometers from the old dam. - Marib region is characterized by dry desert climate. - The fall of the annual rainfall varies between (50-100) mm per year. - Evaporation rate (3700) millimeters per year. - The temperature rises in the region during the summer period to reach the maximum, which is estimated by forty degrees Celsius end.