Dissolved oxygen, is an import ant Index for health of rivers. Do depends on water temperature, barometric Pressure and Concentration of dissolved solids in water. All of the rivers have specified capacity for natural treatment or self-purification capacity.
Loss of flow in rivers, decrease the self-purification capability and dissolved oxygen concentration in specific volume of the purpose of recent research is assessing the effect of slope of the stairway angle in the concentration of do and so, measuring the concentration. Of do. In current research, we used three types of stepped slope breaker. Stepped weirs constructed according this specifications: Height of 40 cm, weir slope angle of 13°, stair angle of zero, 5°, 10°, and with 5 stairs. All of the structures prepared from galvanized iron sheets. After construction of physical models and installation in 35 cm flume (belongs to Hydraulic laboratory of water science faculty of shahid chamran University), various flows conducted on Constructions. Changes in Do and temperature were measured on the stairs and up down the stairs using calibrated Do meter. Also, for investigation of interaction between structure and aeration, flow measurement was done on the crest, stairs and upstream of weirs using depth meter.
In each of the physical models, 27 experiments was carried out and the effect of stair angle slope in Do concentration was investigated. The experiments were repeated 9 times during flow variation. Results indicated that, almost in all the constructions the effects of construction action due to increase in Do concentration. Comporison between constructions with slope variation indicated that increasing of stair slope from zero to 5° or 10°, leads to significant with incrdase in reverse slope, the begining aeration area transfered to downstream that belongs to Energy loss. It’s due to increase in temperature. with increase in reverse slope, aeration decrease because aeration zone transfered to downstream
 

Sedimentation in reservoirs the most important factor is the reduction of the useful life of the dam and its reservoir volume. Such as Eclipse lower valves and path dams, damage to plant equipment, reducing the reservoir water quality, all financial and environmental damage will have to follow. Therefore, further study of sedimentation in reservoirs and its various aspects is necessary. The most important factors of sedimentation in dams is turbidity currents which are the simple definition stream flow is said to be concentrated fluid in the fluid move with different density. Movement of these currents is the effect of gravity on the density difference. Turbidity currents in the underpass of more dams and has three parts: head, body and are immersion point. Density currents and sediment entering the reservoir dam near the dam, in addition to reducing the useful life of the dam reduces the useful volume, congestion and damage to the plant's irrigation valves. So controlling the flow of liquid is critical to the dam construction industry. The study investigates the effect of impeding the flow control numerical method has been concentrated in the dam reservoirs. Numerical simulation helps to without the high cost of necessary studies conducted in this area. One of the many applications in the field of computational software engineering designs commercial Ansys-CFX software is that this software has been used in this study. In this study, for calibration of numerical model, laboratory results of Sheykhinejad () has been used 4 experiments were simulated. Two experiments were conducted with sloped floor without roughness and two with roughness. Stagger type roughness was used with 5.5 and 2.5 cm in height, and slop of 0.5% and 2%. For simulation of turbidity current, k-ε ,k-ω ,RNG turbulence models were employed. Outcome of this modeing showed that Ansys-CFX software is a suitable numerical model for studying and analyzing two phase currents specially turbidity currents. These results also corresponded with labrotary model. These simulations also clearly showed that roughness of the floor reduces speed of current dramatically.

Rivers have always been one of the valuable natural resources for various human uses. Therefore, it is necessary to protect rivers. Erosion of river banks is one of major problems in Engineering River sciences (Especially erosion at river bend). Spur dike structures is usually used to protect the banks with different purposes. Bank attached vanes is one of the environmental structures with a different capabilities. It is a new method which is used to control the bank erosion, flow deviation from the banks towards the channel, improve the sediment transport, river development to boating, and in-stream habitat restoration. Although the application of bank attached vanes has many advantages, the erosion caused by interaction of flow and structure that occurs around the tips of structure, is considered as one of the main problems of these structures which will ultimately leads to their destruction. The bank attached triangular vanes has less scour depth at their tips toward the spur dikes because of their geometrical shape. But this vanes are not immune from the local scour around their tips. Various factors such as shape, infiltration percent, distance and number of spur dikes are effective to the performance of spur dikes. Another effective factor to the performance of spur dikes, is the angle of structure installation.
One of the methods to improve flow pattern around the structures which are directly contract with the water flow, is creating slot in the structure. Due to the small number of relevant researches about creating slot in spur dikes, in this study, a slot with Specific dimensions was created in bank attached triangular vane, and the effect of the slot on flow pattern improvement around the structure was investigated. By determining the effect of slot on flow pattern improvement around the structure, the effect of angle of bank attached slotted triangular vanes on the bed topography of around the vanes was analyzed. The experiments were conducted in 90 degree bend flume (R/B=4 with 70cm width). In order to achieve the purposes of present study, the single-triangular vane (with and without slot) was attached at angles of 23, 30, 40 and 60 degrees to the bank of the flume in the location of 72 degrees of flume arc. Experiments were conducted under different hydraulic conditions (Froude numbers 0.287, 0.304 and 0.322) and under the clear water conditions. The present study contains 24 experiments. The created slot in the vane is a rectangular slot, with opening percent equal to 10% of the effective surface vane (surface of the vane that is in contact with the flow directly), the ratio of length to width of the slot is equal to 4 (b/a= 4) and the location of the slot is parallel to the chord.
Results of the study on effect of the slot on bed topography variations showed that the average reduction of maximum scour depth by means of slot at the angles of 23, 30, 40 and 60 degrees have been 70, 20, 17 and 54 percent, respectively. Also the created slot in the vane caused the maximum scour depth to form away from the outer bank. Investigations on the slotted vanes (With different installation angles) showed that the maximum scour depth has the lowest and highest value at angles of 23 and 40 degrees, respectively. Also by increasing of angle up to 40 degrees, the maximum scour depth has formed away from the outer bank and at angle of 60 degrees has reduced sharply.
 

<p style="text-align: justify">Abstract :Water passes through steep slopes water in river engineering problems building designs structures is inevitable. Construction overflow and water-steep, streams, etc. in the minor water structures is undeniable. Energy control at high speed flows, one of the challenges is the design of hydraulic structures. This, for example, in places like structures spillways, drainage systems in urban areas and steep mountain rivers occur. High speed flow over the overflow cause corrosion of concrete and when the hand reaches down into a subcritical flow and formation of a hydraulic jump. Because the energy has a great potential to reach the jump leads to the removal of sediments downstream of the river. It can be seen when scour depth. It can be seen when scour depth reaches the depth to bedrock and cause the piping leading to the destruction of the structure itself. Flow control and energy dissipation done with a series of method, including the creation of a stilling basin, stepped spillway, and noted ski jumping. Such as methods for reducing. or remove downstream energy dissipation structures, using methods to reduce the energy is flowing on the streams. The method can be used to putting obstacles or roughness of the bed surface are steep. Use obstacles large scale can cause flow separation, the formation of turbulent flow and thus reducing the kinetic energy of the stream. The problems of obstacles, high costs and the risk of cavitation them. The roughness of the bed may be on an equal footing with other methods, an effective way to reduce energy loss is scouring. In this study, density of artificial roughness on the downstream scour it with sand, were studied.At first, after the effective parameter identification, without further developed public relations. Then experiments on physical models in two different staggered arrangement with the roughness in three different concentrations (5%, 10% and 15%) on was performed on the bed streams. The scouring downstream flow rates of 15 to 26 Lit/s in the test 28 were examined . The results of tests show reduced by creating roughness on scouring bed streams. So that the density increases at a rate of 5%, 10% and 15% of the average depth of scour at best make-up, respectively, 5/28, 5/44 and 25/53 percent, during the scour holes 18, 34 and 36 percent and the total length scour 20, 36 and 36 percent compared to the substrate without roughness decreased. In a constant density decreases with different makeup scour the make-up 2 more The amount in the highest density compared with an average of about 12 percent make 1 show. Finally, a general relationship to predict the rate of decline in this type of scouring of stream were presented and realized who relationships that corresponded with experimental data.</p>

The energy control in flow patterns with high velocity, one of the challenges design of hydraulic structures. For example the stream in areas such as drainage systems in urban areas and mountain rivers with steep slope accures . in hydroulic engineering application of hydroulic jump type energy dissipater structure is one of the common teachniques for reducing scoure in road with slope. At the downstream of this basin, threed dimensional flow patterns is developed which its vertical flow component impinges the bed, pick up the sediment and flashed a way to the downstream. such process is continued and a scoure hole is developed,of actions that can be used to reduce scour, putting roughness and obstacles in waterways. Use obstacles large scale can cause the separation of the substrate, creating turbulent flow and thus reducing the kinetic energy of the flow. The problems of obstacles, high construction costs and cavitation them. The use of artificial roughness for streams may be on an equal footing with other methods, is an efficient method for energy loss. So recently the structures for easy implementation, cost, special attention has been. In this article the effect of the scour hole geometry of roughness on the reduction of erosion, The effect of type A jump parameters to scour, Investigate the similarities scour profiles on longitudinal sections and provide equations for estimating scour depth and length in the condition of jump type A were studied. In order to achieve the desired objectives of the study and the scouring effect of jump type A in the first after the effective parameter identification, the relationship general dimensionless was developed. Then experiments on physical models in three gradients (11,13,15 degree) by placing three types of roughness with geometries (square, triangular, cylindrical) on the surface of the moving bed downstream of creation Was in the hydraulic laboratory of Shahid Chamran University. Scour the on ramp structure by performing 48 different experiments with flow rates were between 14 and 26 liters per second In addition, the results show that the effect of roughness in reduction of scour depth, at first has the increasing and then the decreasing trend that this issue shows that the roughness has the better performance in low discharges. Also the maximum reduction of scour depth occurred in slope of 11 degrees with triangular roughness amount of 49 percent and the minimum reduction of scour was seen in slope of 15 degrees with cylindrical roughness amount of 23 percent . length and the total length of the scour hole was under the influence of hydraulic jump type A and realized who obtained relations corresponded with experimental data.

River bank erosion caused sediment production and setbacks of river bank, imported a lot of damage to land, river riparian structure and agricultural land and caused water quality degradation, destroy riparian ecosystems and habitats of fish and the river. Erosion sides of the river and changes in the quality and quantity of river flows, soil and water resources is an important issue from an environmental standpoint is also important. In order to decrease and control the bank erosion and to restoring fish and other aquatic organisms’ habitat the environmental friendly structures are suggested. Vanes are among the in-stream structures which are used to control the bank erosion, flow deviation from the banks towards the channel, improve the sediment transport, enhance recreational boating, and in-stream habitat restoration. Extreme erosion at the toe of Bank attached vanes, causes the structure and the neighborhood banks failure. Therefore, countermeasure methods should be employed in order to prevent financial damages and life hazards. One of these methods is to use a slot. The application slot is to deviate the destructive flow and reduced vortex created upstream of the structures around it. A sacrifice vane was used to reduce the vortices power around the first vane. Also the application of bank attached vanes have many advantages, there is not precise information relevant to the scouring and deposition, and flow pattern around them under the different hydraulic and geometric conditions and there is not enough study on this matter. According to the aforementioned cases, the present study investigates the effects of slot and the distance between the vanes on the erosion and sedimentation pattern around them in the 90˚ mild bend under the different hydraulic conditions. In addition. The effect of sacrifice vane on the bed topography around the first vane head triangular vans attached to the bank in the 90 degrees mild bend. To study the effect of the slot on Scouring bed, used of Series triangular vanes attached to the bank in two modes no slot and the effective length over 20 percent of the flume, the vane angle to the upstream bank 30 degree, Distance of 4, 6 and 8 times the effective length and Froude numbers 0.287, 0.302 and 0.322. In addition to the effect of the distance between the vanes used of Series triangular vans attached to the bank in two modes no slot and the effective length over 20 percent of the flume, the vane angle to the upstream bank 30 degree, distance of 4, 6 and 8 times the effective length and froud numbers 0.287, 0.302 and 0.322. To study the effect of sacrifice vane on bed topography first vane used a rectangular vane with a distance of 4 times the effective length ratio of the first vane, with the angle to the upstream bank 150 degree and the Froude number 0.287. All of the experiments were implemented in a flume with the 90˚ mild bend (R/B=4) and the width of 70 cm under the clear water conditions. The results showed that the sacrifice vane decreased scouring depth around first vane was 20 percent. The results showed that the slot reduced the depths of scour around structures. The maximum depths-averaged scouring around triangular vanes decreasing was 22.6 percent. The results showed that with increasing the distance between the slotted triangular vanes attached to the bank increased depths-averaged scouring around vanes and its extension increased to the outer bank.

In the recent century, regarding the increasing in population for more than three times , the twenty times raising in gross international production, and also their pressure on our planet ecosystems like atmosphere, the oceans, water, soil, forest,… the environment would drop to an unknown deterioration. Generally, the nature of the environmental crisis has been arisen because of the conflict between what modern global economies requires environment and natural forces' ability to meet them. In capitalist systems of supply and demand, it could be expected to resolve environmental problems, by providing a solution that could be spendable as product. Indeed, there is broad agreement on a fact that the current pollution, environmental degradation and deterioration caused due to lack of markets for goods and ecosystemic services.
The aim of this thesis is calculates non-market ecosystemic services value in providing one of the so usury production as milk in three types of packaging of a liter, Transparent polyethylene terephthalate bottles (PET), bottles opaque polyethylene and polypropylene Patches. This value has calculated for landfill and recycling scenarios result as a non-market value of ecosystemic services or the cost of environmental damage or the shade price. With considering this value in production, consumption and disposal processes, the impact on the environment and also its effect on aligning these processes with environmental have been reviewed. To determine the environmental impacts, has been used the life cycle assessment (LCA) method. Additionally, economic valuation methods have been used for the prevention. The results costs are divided between the four active business firms to minimize environmental damage results. Therefore, by increasing in the price, each of the beneficiary sought to reduce costs that results the reduction in environmental damages accordingly.
 

 Recently, desert and desertification issues are known as one of the most problem in most countries especially developing countries. With an attention to the natural resources of Iran we can concluded that the most of Iranian lands are classified as deserts. Desert scientists believe that in addition to natural factors, human factors has a significant and important role in desertification. As natural factors are the most of the desertification criteria, models of desertification potential assessment are provided locally. In this research, in other to evaluate the affecting criteria and induce in desertification, south-east of Ahwaz region was studied. Iranian Model of Desertification Potential Assessment (IMDPA) and among nine criteria, two criteria such as vegetable cover and climate were selected to be evaluated. Different indices were used for each criterion. In this model, numerical values of criteria were calculated by Geometrical average mean of indices. Finally, desertification of total studied region was estimated from the Geometrical average mean of criteria and final region desertification map was provided using ArcGIS software. The results showed that vegetation criteria with the numerical value 2.06 have the greater effect to criteria climate with the numerical value 1.93 on desertification in south-east of Ahwaz region. Finally, based on the two investigated criteria, quantitative value of desertification intensity was estimated to be 1.99. Based on the scoring tables of studied model, the region desertification was determined to be moderate.

 Connected to a mild slope channel stilling basin is a structure that is made of concrete constructed in downstream of weirs and chutes.This structure makes the length of the hydraulic jump shorter and stabilize the location of it. One way to optimize geometric features of hydraulic jump is to make the stilling basins less smooth rough surface causes intense mixture and therefore increasing Reynolds and friction in the basins in the above mentioned case hydraulic jump needs a shorter tail water depth and decrease hydraulic jump length.This research is conducted in order to investigate the effects of non-continuous roughness shape and arrangement of them on hydraulic jump features. In the present investigation, roughness shapes used are cubic, triangular and combination of cubic and, triangular. Height and surface area (perpendicular to flow) are 1.6 and 1.6×1.6 cm. In this study, 35 experiments with Froude number about 5.13 to 9.75 are carried out and the roughnesses were experimented with two different arrangement (the first arrangement, the roughnesses from together is 4.8cm and the second one that is denser than first one is 2.67 cm). The results suggest that the rough elements can reduce hydraulic jump length, rolling length and conjugate depth 38.16%, 35.36%, and 25.16% respectively.The most effective shape and arrangement are a combination of cubic and triangular shapes with type two arrangements. The boundary shear stress on average, the rough bed of about 13.39 ratio increased to smooth bed and the highest amount is for combination of cubic and triangular with 14.26 ratio. Energy loss increases 12.74% and in the most effective shape and arrangement 14.32%. Finally, For the rough surface of stilling basins equations to conjugate depth, hydraulic jump length, rolling length and bed shear stress using initiate Froud number are presented.

Sedimentation in reservoirs the most important factor is the reduction of the useful life of the dam and its reservoir volume. Such as Eclipse lower valves and path dams, damage to plant equipment, reducing the reservoir water quality, all financial and environmental damage will have to follow. Therefore, further study of sedimentation in reservoirs and its various aspects is necessary. The most important factors of sedimentation in dams is turbidity currents which are the simple definition stream flow is said to be concentrated fluid in the fluid move with different density. Movement of these currents is the effect of gravity on the density difference. Turbidity currents in the underpass of more dams and has three parts: head, body and are immersion point. Density currents and sediment entering the reservoir dam near the dam, in addition to reducing the useful life of the dam reduces the useful volume, congestion and damage to the plant's irrigation valves. So controlling the flow of liquid is critical to the dam construction industry. The study investigates the effect of impeding the flow control numerical method has been concentrated in the dam reservoirs. Numerical simulation helps to without the high cost of necessary studies conducted in this area. One of the many applications in the field of computational software engineering designs commercial FLOW3D software is that this software has been used in this study. In this study, the numerical model calibration of laboratory results Ohey (2007) was used. 3 experiments with barrier and inclined floor And 2 experiment examined without barrier with horizontal and inclined floor. Intended to prevent a ridge height of 24 cm to the total width of the flume created and shaped it follows the Gaussian function. Also in this study, the effect of preventing grid plate with porosity of 0.3, 0.5 and 0.67 using commercial FLOW3D software has been investigated.
Concentrated to simulate the flow of turbulence models . RNG and has been implemented. Modeling results show that turbulence model is more consistent than the other models in the simulation of vertical distribution of the liquid flow rate.

 Sediments from the riverbanks are made of two parts, general erosion and mass destruction of riverbank. The cause of general erosion is one-dimensional flow in river channel. This erosion occurs in a long period of time and its effects on riverbank are gradual, but unlike the mass destruction cause, riverbank soil strength parameters that flow conditions in the river channel do not have any effect on it but water level change in river channel affect soil strength parameters and therefore riverbank safety factor also changes. It usually happens when flood strikes, hence due to the short period of time of water level change, this erosion is immediate. Also, underground water in riverbanks that flow to river channel (seepage flow), reduces soil strength parameters and consequently maximizes this kind of erosion. Since the instability of slopes causes larger volumes of soil to fail, mass destruction forms most sediments of the riverbanks.
The present study was done on Karoon river, Ahvaz. First, using Hec-Ras, water level profiles in river channel in 160, 1200, and 2600 (two-year cycle discharge ) discharges were found 3748 (ten-year cycle discharge), 4253 (fifty-year cycle discharge) cms and then stability of river banks was analyzed in 9 phases using Plaxis. The obtained results reveal that underground water has the most effect in …. Factor. Also, the effects of water level change in river were remarkable. Finally, it can be concluded that about 40% of riverbanks in this period are either in critical or instable status and according to the agricultural and industrial importance of this region, to modify instable riverbanks, considering the circumstances of this region, the use of horizontal drain pipes was suggested.

River bank erosion causes sediment and migration of bank, it also causes a lot of damage to the agricultural land and river structures. Therefore controlling river erosion is an important issue in river engineering. Bank-attached vanes are environmental structures which are used to control the bank erosion, deviate the flow from the banks towards the middle of the channel, improve sediment transport, enhance the river for navigation and in-stream habitat restoration. Although the application of bank attached vanes has many advantages, this structure is exposed to scour due to flow convergence at the nose of structure which is a disadvantage for the structure. According to the importance of this issue (local scour around the structures), It is necessary to investigate the effect of the slot on the local scour depth around the structure. The main application of a slot is to deviate and change the down ward flow at the upstream region of a vane and it also reduces the strength of the vortices around the structures. In this research, the effect of the location of slot on the reduction of the scour depth of a submerged triangular vane attached to the bank in a straight channel and different hydraulic conditions is examined. For this purpose, vanes with 11,19,27 cm length of slot and 1.5,2.5,3 cm distance of slot from the vane nose and 4 experiments with vanes without slot were tested. Experimental tests were conducted in clear water condition in a flume with 7.3m length, 0.6m height and 0.56m width for four Froude numbers 0.18,0.2,0.22,0.24. The water depth in all the experiments was 16 cm. The vanes were located with a 45 degree angle and distance between them was 4 times the structure's effective length. sediments with mean diameter equal to 0.7 mm were used. The results showed that by increasing the slot length and the distance of slot from the vane nose, due to the reduction of flow turbulence and the strength of vortices around the vanes, the scour depth reduces. Meaning that vanes with 27cm length and 3cm distance from the nose of vanes are more effective in reducing the scour depth compared to other vanes with slots. Also compared with vanes without slots the maximum scour reduction was 95% and related to these vanes.
 

Spillways are types of hydraulic structures which are used to transfer or pass additional waters or floods from upstream to downstream of dams. Bell-mouth spillways are usually (commonly) used in dams on topography of the narrow valley and in situiation where connectively is peovided to a downstream tunnel. These spillways are consist(ing) of three main components; crest, Shaft, and an almost horizonal tunnel. To this end, Alborz dam’s bell-mouth spillway has been validated with the best turbulence model in Flow 3D software. The results indicate that LES turbulence model is more accurate. Next, spillway validated by exprimental data, and then some expriments were done(performed) on spillway. The purpose of the research is investigating the impact of change in slope of horizontal tunnel, the change of wall roughness, vertical Shaft with variable diameters, change the length of the horizontal tunnel, and also changing the length of Shaft on hydraulic parameters such as depth, velocity and pressure and also on hydraulic jump in spillway. Results showed that with each mentioned changes in the structure, what changes occur in the flow parameters in spillway, as well as what changes occur in the type and length of hydraulic jump created at the beginning of the horizontal tunnel of spillway. This works provides best design and optimizes a spillway with the best suitable and most economical changes

bridge is one of the strategic structures that is sometimes exposed to the flow of the river and its abutment with a scouring, and destruction is followed. So check flow around the bridge abutment on the river path that is factor of destruction and damage it, is important. since the river is not always direct and there is bend (meander) in some intervals, the study of the flow around the bridge abutment in bend path, is important. However, the data from the experimental results in this field is limited. Therefore, this study aimed to Numerical simulation of flow around abutment in the 90-degree flume bend using FLOW-3D software that flow simulation in bend is carried out according to comparison with experimental results, without the presence of the abutment.
software Simulations with the presence of wingwall abutment on both sides of bend for three discharge 15, 25 and 35 liter per second, respectively, corresponding to three Froud numbers 0.17, 0.28 and 0.4 and four angles of establishment of wingwall abutment along the bend equal with 0, 30, 60 and 90 degree of sharp bend was done. For each simulation, the water surface profile along the bend, maximum cross section velocities along the bend, velocities page of each cross sections including efficiency of width and depth velocities and secondary flows was plotted and were compared. To draw streamlines and rotational cells of secondary flow, the velocities output of FLOW-3D intered as input with TECPLOT and results were extracted.
The final results of the run of all these simulations showed that by increasing the Froud number, longitudinal velocities are increased and in all three Froud numbers, location of maximum longitudinal velocitiy transfers from inner wall to outer wall. For examined cross sections in the bend, in all three Froud numbers, the lowest maximum velocity occurs at 90 degree. Also by increasing the Froud number, maximum velocity increase.
In all three Froud numbers, the maximum afflux occures in 40 degree (about the middle of the bend) with presence abutment in 30 degree, respectively 3.5, 10.7 and 26.4 mm. by increasing the Froud number the maximum afflux increase.
in Froud number 0.17 among different angles of abutment location in the bend, maximum velocity occures in zero degree (abutment nose at inner wall) about 0.35 meter per second, which reduces the water depth in this area and increases the difference of water surface elevation than others. Similarly, also in Froud number 0.28, the maximum difference of water surface elevation happens in 60 degrees where maximum velocity occures equal to 0.7 meter per second. For Froud number 0.4, the maximum velocity is 0.84 meter per second in 30 degree that is approximately equal with velocity in 60 degree (0.81 meter per second), ie where the maximum difference of water surface elevation have happened.
 

meandrs rivers three-dimensional nature of the flow, if the pattern of flow and sediment transport in open channels using three-dimensional numerical models suggest. In the present study using the FLOW-3D three-dimensional numerical model of flow and bed level changes in the central arc sine channel. After a review of the results of modeling with experimental results turbulence model LES turbulence model was selected as the most appropriate and calibrate the model with the equivalent roughness height 5d50 been made. The model has an acceptable precision erosion near the outer and inner arc stack deposited in the model. With the deployment of submerged weir in the central arch, maximum speeds near the outer arc transferred to the nose overflows with an average increase of 16% to 42% reduction in the speed of the inner and outer arc was. Settlement of the spillway crest length ratio of 0.4 and a 60 degree angle and slope 0%, 2.1% above the maximum water level and the establishment of a steep weir water level has come down in all cases. Overflow seating in all cases, outer protection from erosion along the spillway apexes moved to channel Alqr line and maximum relative erosion in Cape overflow last and the penultimate and maximum erosion in the ratio of 0.3, the slope angle of 75 degrees and 0% Happened. By increasing the slope of the relative erosion in the nose overflows greatly reduced. The effect of spillovers sedimentary stack height not seen a significant change in the internal arc and a maximum decrease of 3%. Also spillovers reduce the height of the hill sedimentary deposits in cross sections and with a reduction in the length, slope angle increases and an increase in deposits In grades decreased.