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Bakenaz Zeydan , Water Engineering Department. The hydraulic structures play a very important role in controlling the channel discharge and the water levels, but the presence of the hydraulic structures in channels infested by aquatic weeds may cause significant problems for the performance of these structures. This infestation has started shortly after the construction of the High Aswan Dam. The most prevailing type of aquatic weeds is the submerged weeds. This type of weeds decreases the channels hydraulic efficiency as the low resistance increases. In the present study, the effect of submerged weeds density on the performance of vertical sluice gates was analyzed experimentally. The dimensional analysis was employed to derive an expression for the discharge coefficient and an equation for predicting the energy losses on the gates are developed. The experimental modeling was developed for a double vent regulator model with vertical sluice gates constructed in a trapezoidal flume and the branched flexible roughness were used to simulate the submerged weeds. The extensive laboratory measurements concentrated mainly on the discharge coefficient, the energy losses, the variation in the water surface profile, the velocity distribution and the variation in the equivalent roughness coefficient. Experimental modeling; Dimensional analysis; Vertical sluice gales; Submerged weeds; Branched flexible roughness; Discharge coefficient. Energy loss. Advanced Search. Privacy Copyright. Skip to main content. Corresponding Author El-Samman, Tarek. Subject Area Civil and Environmental Engineering. Article Type Original Study. Abstract The hydraulic structures play a very important role in controlling the channel discharge and the water levels, but the presence of the hydraulic structures in channels infested by aquatic weeds may cause significant problems for the performance of these structures. Keywords Experimental modeling; Dimensional analysis; Vertical sluice gales; Submerged weeds; Branched flexible roughness; Discharge coefficient. Select an issue: All Issues Vol. Elsevier - Digital Commons.

Why It Still Sucks To Get High in the Arab World’s Biggest City

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Only two years ago, Abdesselam Ichou began growing cannabis legally as part of Morocco's legalisation of the plant for medicinal and industrial uses in an impoverished part of the country. Now, he is among thousands of legal farmers whose area of cultivation has reached new highs and cut into the still-dominant illegal trade in Morocco, the world's biggest cannabis resin producer, according to the United Nations. The North African country passed a law in allowing the cultivation of medical and industrial-use cannabis in areas of Rif, a mountainous region that has long been a major source of illicit hashish -- a stronger derivative of cannabis -- smuggled to Europe. Chefchaouen is one of the three provinces where cannabis cultivation is permitted under the law for non-recreational use. Morocco's partial legalisation of cannabis sought to combat drug trafficking and improve the farmers' livelihoods, supporting up to , families in the region whose economy relies on cannabis which has been grown there for centuries. In its first harvest of legal, low-potency cannabis last year, the country reported an output of tonnes, according to ANRAC, Morocco's cannabis regulating agency. For Ichou, it was 'a record harvest of almost eight tonnes on one hectare 2. The Moroccan firm that bought it decided to invest in two more hectares for the next harvest. In , Ichou was the only farmer in his village to legally grow cannabis. This year, he said, there are about In Chefchaouen, Hoceima, and Taounate -- the Rif provinces where non-recreational cannabis cultivation is legal -- the number of farmers went from to 3, in a year, according to ANRAC. The surface area of legal cannabis crops increased almost tenfold, according to the agency, going from hectares in to 2, hectares in But that hardly compares to the 55, hectares which official figures say were grown illegally in El Gueddar, who belongs to a cooperative, added that he has 'a lot of hope, because it can only be better than living in the precariousness of illegality. After relying on imported seeds for the legal cultivation, beldia, a local variety of the plant that's drought-resilient, will be harvested for the first time in August. Along with dozens of other farmers, he created a cooperative dedicated to growing the local variety on more than hectares. For industrial cannabis use, ANRAC has issued more than permits, including about 60 in cannabis processing, 20 for seed importation, and around 30 for cannabis export. Aziz Makhlouf seized the chance by creating Biocannat, a cannabis processing factory employing 24 people in Bab Berred, southeast of Chefchaouen. Since the start of the year, his factory has transformed around 30 tonnes of cannabis into different products -- CBD resin, oil, flour, creams, candies, and food supplements. But while cannabis regulation helps to 'slowly build a reliable and resilient economy', it remains challenging 'to absorb the illegal sector as of now because it has its market', said Mohamed El Guerroudj, the head of ANRAC. Legal growers could eventually make a percent turnover compared to four percent on the illegal market, according to official studies. For now, the kingdom's priority is to help improve the lives of the population who rely economically on the plant, he told AFP. Treating 'cannabis production as a normal agricultural sector,' Guerroudj said, will enable them to emerge 'out of the shadows In Morocco, cannabis growers come 'out of the shadows'. Related Articles. In Morocco hills, cannabis farmers bet on budding industry. In Europe's cannabis market, Morocco faces stiff competition from Israel. Harry Clynch. In London , reporting on Middle East economics. Morocco's farming revolution: defying drought with science. Lebanon's budding hashish business brings high returns. Fernande van Tets.

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