A control tool for irrigation canals with scheduled demands

2008 ◽  
Vol 46 (sup1) ◽  
pp. 152-167 ◽  
Author(s):  
J. Soler Guitart ◽  
M. Gomez Valentín ◽  
J. Rodellar Benedé
Author(s):  
Elena Makarycheva

The aim of the article is to develop a method for calculating water losses from irrigation channels in determining the permeability of rock in the zone of filtration flow on the basis of the law of infiltration A.N. Kostyakov using the results of studies of free filtration from pits and foundation pits in loess loams. Pressure movement of water in irrigation canals is subject to the laws of two-phase flow, in which – in contrast to the Darcy law for the zone of saturation plays an important role, the volume and its change in time. The filtration rate (VF) increases with increasing rock moisture (θ) along the S-curve, while the pressure gradient (I = dh/dz) decreases. The dependences of these parameters on the pressure are represented by power functions, and their product CDP = VFI does not change in time and can serve as a characteristic of the filtration flow under the channel. When installing paired piezometers near the water chore line in the channel and determining the graph I(t) by the value of the twophase flow constant CDP, it is possible to calculate the filtration rate at a number of times and the water losses during unsteady filtration. Water losses from the channels at equilibrium humidity increases with increasing head according to the formula A.N. Kostyakova, in which the water permeability of rocks is characterized by a steady filtration rate at a head of 1.0 m, and the gradient is the function of pressure. The application of the proposed method of calculating losses in the design of irrigation systems will increase the reliability of the justification of the volume of anti-filtration measures and the forecast of the groundwater level.


Generasi Emas ◽  
2018 ◽  
Vol 1 (1) ◽  
pp. 51
Author(s):  
Ida Windi Wahyuni

Moral planting to children from an early age is very important considering that in the era of an increasingly global era, moral education as the basis of self-discipline to be an internal control tool in behaving consistently in religion. A child is naturally created in a state ready to receive good and evil. The habituation of religious and moral values ​​for early childhood is very important to apply as early as possible to the most basic foundation in the process of growth and development of children. The objectives of this research are (1) To describe TPQ Al-Khumaier program, (2) To describe the application of moral values ​​to students by TPQ Al-Khumaier teacher (3) To know the obstacles in applying moral values ​​to the students of TPQ Al-Khumaier and looking for a solution. The results of this study indicate that the program TPQ Al-Khumaier has been implemented according to the program prepared by the school in collaboration with Kemenag Pekanbaru. The application of santri moral values ​​has been practiced in the activities and the process of habituation and modeling of the teachers. The obstacles are the duration of the meeting, social outside TPQ, including social media at home and in the neighborhood where students live.


Author(s):  
Derrian Widjajahakim ◽  
◽  
Handhika Putra Hwary ◽  
Natasia Natasia ◽  
Ibnu Safari ◽  
...  
Keyword(s):  

Author(s):  
María José Castillo ◽  
Richard Beilock

In the 1980s, Ecuador began an expensive project providing primary irrigation canals to the Santa Elena Peninsula. The intended beneficiaries were the region's communal farmers. Instead, virtually all irrigable lands have been sold to large farmers and land speculators, usually at exceedingly low prices. While political and economic abuses explain some of these sales, introduction into a communal setting of an innovation which improved returns to capital relative to labor made land divestitures almost inevitable. With effectively no access to credit, communal farmers had little ability to invest in secondary irrigation systems. Moreover, because users of irrigable lands did not fully control communal sales decisions, as these lands became attractive to others, dispossession risks rose. The net result was that reservation prices for holding these lands fell among communal farmers at the same time of increased demands for these assets by those outside the comunas. Implications for development strategies are also discussed.    


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