The spillway capacity can be adjusted to increase the crest of spillway length, or increasing the coefficient discharge or effective head, or any others permutation of these approaches. In a standing spillway, a labyrinth weir constructing is a case of an active technique for increasing the length of spillway crest and as resultant increase the capacity of discharge (up to 3-4 times) for the identical effective head. Therefore, labyrinth weirs are well-matched to the sites. There are many effective factors such as width to the height of the weir which is called a vertical aspect ratio (w/p), head of water to height of crest ratio (Ht/p), angle of the side wall (α), and conditions of channel that effect on the weir capacity and labyrinth weir hydraulic design of. In this paper four different geometric variations applied to a two cycle of sharp crested trapezoidal labyrinth weir under free flow condition which include changing of vertical aspect ratio (w/P) (width to height ratio) that have effects on the hydraulic efficiency of the labyrinth weir and state the effect of the hydraulic parameter Ht/P on the coefficient of discharge (Cdw ) over weir. It was concluded that decreasing w/P has affirmative effect on the discharge capacity. On adverse it has influence of decreasing the discharge coefficient by about 20% (when increasing w/P to 1.5), while increasing it to 2.0 and 2.5 will cause more reduction to Cdw ranging from 32% to 25% for w/P=2.0 & 40% to 35 for w/P=2.5. The smaller values of the head Ht provide more discharge coefficient.

The aim of the current research is to identify the effectiveness of a recreational and sports program to improve the quality of social life among female students at Al-Qasim Green University. The researcher used the one-group experimental method. (prepared by researchers), recreational sports program (prepared by researchers), The most important results of the research revealed that there are statistically significant differences between the mean scores of the female students on the quality of social life scale in the total score and the dimensions of the experimental group in the two tests (pre/post) in favor of the post-test, and there are statistically significant differences between the average ranks of the scores of the female students on the scale of quality. The social life in the total score and dimensions of the experimental group in the two tests (pre-post) in favor of the follow-up test, and there were no statistically significant differences between the mean ranks of the experimental group students' scores in the test of social life quality in the total score and dimensions between the post.

Computational Fluid Dynamics (CFD) modelling in field of hydraulic structures and river engineering is continuously growing in recent years, through applied this powerful tool for modeling several types of multiphase flow. The objective of current study, it is to extends clear understanding of multiphase flow around stepped spillway for different steps configuration and to test the capabilities of the CFD Model (Fluent 18.2) to represent these phenomena. VOF method adopted to capture interface between water and air, k-ε turbulent model for turbulence parameters and (PISO) Pressure Implicit with Splitting of Operator algorithm is used. Experimental study is carried out for four model configuration according to the steps aspect ratio H s /L s (1, 0.75, 0.6 and 0.5) for flow rate range (10, 15 and 20 L sec -1 ). physical model made from plywood with smooth surface. CFD Model demonstrated an acceptably recorded result in predicting the energy dissipation rate for different steps configuration compering with the experimental results. Also, it is obtained that the energy dissipation rate is increases with increase the steps aspect ratio. time steps size it about 0.005 sec or less are recommend to capture the flow pattern and secondary flow around stepped spillway.

In this research, a hydraulic model is used to find the effect of the cutoff angle and dimensions of the void in the soil on the head pressure and leakage under the dam, and finding the best angle and size of the void will have a positive effect. The model was designed with a cutoff that can be moved in three angles (45°, 90° and 135°) in the center of the dam and three ratios of void dimensions (width of the void (W)/the dam width (b) = 0, 0.34 and 0.69) were taken. Head pressure was measured using a piezometer installed in the front of the model. When the flow reached the balance, leakage and pressure head were measured. From the results, it was observed that the lowest head pressure value occurs when the angle is 90° and the void ratio is 0.69. The principles of dimensional analysis and non-linear regression by using IBM SPSS 19 were used to find an empirical formula for the computation of the head pressure depending on the angle of the cutoff and the size of the void.

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