Flow Characteristics of Lateral Irrigation Canals Diverted from Kimje Main Canal in Dongjin Irrigation Area

Objectives of the Study: An Epidemiological Research, a cross-sectional study, was conducted to determine the magnitude of human contamination of irrigation canal perimeter as it relates to the prevalence and intensity of schistosome cercarial infection in snail vectors. Place and Duration of Study: The study was conducted along water canal located within an irrigation area, Kano River Project Phase I, Kadawa, between January and June, 2012. Methodology: The study area was categorized into Zone of Heavy Contamination (ZHC), Zone of Light Contamination (ZLC) and Zone of Free Contamination (ZFC) based on the density of faecal lumps observed along the canal perimeter using 1 m2 quadrat sampling technique. Snail vectors of schistosomiasis were collected from these zones, identified and subjected to cercarial shedding. Brevifurcate apharyngeate cercariae were identified as schistosome cercariae. Results: Of the 827 snails collected 28.54% shed schistosome cercariae. The breakdown of infection prevalence was 31.37%, 27.69% and 26.26% for ZHC, ZLC and ZFC respectively. Three snail species recovered in the study area, Bulinus globosus, B. rohlfsi and Biomphalaria pfeifferi had infection intensity of 8.6, 5.67 and 3.94 respectively, with total mean intensity of 4.67. A Chi-squared analysis did not show any significant difference in infection prevalence in the three zones (χ2cal. 0.025, χ22, 0.05 = 5.99). However, infection intensity was significantly different in the three zones and among the three snail species using analysis of variance (P<0.05). Conclusion: Human environmental contamination with faeces and urine around irrigation canals remains the source of infection to snail hosts and then to humans. It is presumed that contact control through avoidance of defaecation in the open and building of pit latrines near water contact points along irrigation canals will be effective means of drawing a barrier to infection with schistosomes in the study area.

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Investigation on Temporal and Spatial Distributions of Soil Moisture and Salinity in Typical Subareas of Ningxia Yellow Diversion Irrigation Area

10.3233/atde210201 ◽

2021 ◽

Author(s):

Xinxia Guo ◽

Hefang Jing ◽

Weihong Wang ◽

Wensheng Zhang

Keyword(s):

Soil Moisture ◽

Yellow River ◽

Soil Salinization ◽

Kriging Interpolation ◽

Spatial Distributions ◽

The Sustainable Development ◽

Irrigation Area ◽

Kriging Interpolation Method ◽

Main Canal ◽

Temporal And Spatial

The problem of soil salinization in Ningxia Yellow Diversion Irrigation Area is relatively serious, which restricts the sustainable development of agricultural production to some extent. In this paper, the soil moisture and salinity along the West Main Canal and Tanglai Canal in Ningxia Yellow River Irrigation Area are investigated through choosing field sampling, and employing Kriging interpolation method. Soil moisture, salinity ions content and pH value are measured, and their temporal and spatial distributions are analyzed. The results show that the salinization in the soil surface of the studied area is cohesive and the soil is alkaline. The salinity content in soil gradually increases from southwest to northeast and the soil salination in Nanliang Farm of the studied area is relatively more serious. Generally speaking, the soil moisture along Tanglai Canal is higher than that along West Main Canal.

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Optimization Of Irrigation Area of Ukai Right Bank Main Canal-A Linear Programming Approach

10.1063/1.3526173 ◽

2010 ◽

Author(s):

Nishi Bhuvandas ◽

A. B. Mirajkar ◽

P. V. Timbadiya ◽

P. L. Patel ◽

R. B. Patel ◽

...

Keyword(s):

Linear Programming ◽

Programming Approach ◽

Irrigation Area ◽

Linear Programming Approach ◽

Main Canal

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Scientific and practical substantiation of geodetic and topographic works using GIS software in the design of hydraulic structures

E3S Web of Conferences ◽

10.1051/e3sconf/202128402006 ◽

2021 ◽

Vol 284 ◽

pp. 02006

Author(s):

Kholmurod Khayitov ◽

Nilufar Avilova

Keyword(s):

Systematic Approach ◽

Hydraulic Structures ◽

Main Task ◽

Irrigation Canals ◽

Geoinformation Systems ◽

Main Canal ◽

Scientific Substantiation ◽

The Republic ◽

Gis Software ◽

Design Construction

In this article, the scientific and practical basis of geodetic and topographic work in the design of hydraulic structures and solutions intended to improve them using GIS (Geoinformation Systems) were analysed. Geodetic and topographic works are the basis for the design, construction and reconstruction of hydraulic structures in Uzbekistan. A systematic approach to the analysis of geodetic and topographic works in the design of hydraulic structures was chosen, which was used to determine the essence of the processes and laws of scientific substantiation of projects of various hydraulic structures. The geological and topographic works were carried out to monitor the condition of the Karshi main canal, and besides, several other irrigation canals in the Kashkadarya region of the Republic of Uzbekistan were studied. The main task of the Karshi main canal is to supply water to various industries, offices, institutions and irrigation canals. After taking the horizontal and vertical topographic data of the Hisorak Reservoir and processing it using the Global Mapper software, a 3D dimensional model of the Hisorak Reservoir was created.

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PERENCANAAN REHABILITASI SALURAN INDUK DAERAH IRIGASI CIBINUANGEUN DI KABUPATEN LEBAK PROVINSI BANTEN

Journal of Sustainable Civil Engineering (JOSCE) ◽

10.47080/josce.v3i1.1133 ◽

2021 ◽

Vol 3 (1) ◽

pp. 1-6

Author(s):

Restu Candra ◽

Rino Dwi Sadi ◽

Ma'ulfi Kharis Abadi

Keyword(s):

Agricultural Land ◽

Water Source ◽

Main Channel ◽

Public Works ◽

Water Drainage ◽

Irrigation Planning ◽

Irrigation Area ◽

Directorate General ◽

Main Canal ◽

The Cost

Irrigation is an effort to provide and regulate water for agricultural land. The main objective of this study is to plan the rehabilitation of the main channel of Cibinuangeun irrigation area, Lebak Regency, Banten Province. The main channel serves to carry water from the main network to the secondary channel and tertiary plot. The material can be made of masonry, concrete or masonry and concrete. The Cibinuangeun main channel relies on a water source from the Cibinuangeun river through the Cibinuangeun weir building. The Cibinuangeun Irrigation Area has a functional area 2570 ha. The condition of the Cibinuangeun main canal currently has a lot of damage, which results in water drainage being not optimal so it is necessary to plan for rehabilitation by directly examining the condition of the canals at the location to determine the volume of damage and calculate the cost of rehabilitation on the channel. The research method used is the Irrigation Planning Criteria issued by the Ministry of Public Works, Directorate General of Water Resources as the basis for standard irrigation planning. The results showed that the trapezoidal trunk channel and the current available flow rate were not in accordance with the initial planning of the Cibinuangeun main channel construction, due to sedimentation and damage to the walls and floor of the leaking channel. The level of damage to the main line reached 47,37% of a total trunk length of 950 meters. The planned cost required for the rehabilitation of the Cibinuangeun main channel is four hundred seventy million four hundred thousand rupiah.

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Flow Characteristics in Diastolic LV Filling Vary Significantly With Different Mitral Valve Prostheses: An In-Vitro Study

Journal of the American College of Cardiology ◽

10.1016/s0735-1097(97)84188-5 ◽

1998 ◽

Vol 31 (2) ◽

pp. 111A

Author(s):

M Gharib

Keyword(s):

Mitral Valve ◽

Flow Characteristics ◽

In Vitro Study ◽

Vitro Study ◽

Valve Prostheses

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Influence of Traffic Flow Characteristics on Traffic Wind of Highway Tunnel

CICTP 2020 ◽

10.1061/9780784482933.138 ◽

2020 ◽

Author(s):

Xue Li ◽

Lipeng Cong ◽

Xuan Zheng

Keyword(s):

Traffic Flow ◽

Flow Characteristics ◽

Highway Tunnel ◽

Traffic Flow Characteristics

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Methodology for determining water losses from irrigation canals

Melioration and Water Management ◽

10.32962/0235-2524-2020-5-16-18 ◽

2020 ◽

pp. 16-18

Author(s):

Elena Makarycheva

Keyword(s):

Filtration Rate ◽

Darcy Law ◽

Filtration Flow ◽

Irrigation Canals ◽

Power Functions ◽

Two Phase ◽

Water Losses ◽

Irrigation Channels ◽

Unsteady Filtration ◽

S Curve

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.

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