scholarly journals Allocating irrigation water: the impact of strategic interactions on the efficiency of rules

2003 ◽  
Vol 30 (3) ◽  
pp. 305-332 ◽  
Author(s):  
N. Faysse
Keyword(s):  
Irrigation Water ◽  
Strategic Interactions ◽  
The Impact

scholarly journals Irrigation water requirements for seed corn and coffee under potential climate change scenarios

2015 ◽  
Vol 7 (1) ◽  
pp. 39-51 ◽  
Author(s):  
Ali Fares ◽  
Ripendra Awal ◽  
Samira Fares ◽  
Alton B. Johnson ◽  
Hector Valenzuela
Keyword(s):  
Climate Change ◽  
Irrigation Water ◽  
Co2 Emission ◽  
Future Climate Change ◽  
Climate Change Scenarios ◽  
Deep Percolation ◽  
Canopy Interception ◽  
Water Requirements ◽  
Seed Corn ◽  
The Impact

The impact of potential future climate change scenarios on the irrigation water requirements (IRRs) of two major agricultural crops (coffee and seed corn) in Hawai'i was studied using the Irrigation Management System (IManSys) model. In addition to IRRs calculations, IManSys calculates runoff, deep percolation, canopy interception, and effective rainfall based on plant growth parameters, site specific soil hydrological properties, irrigation system efficiency, and long-term daily weather data. Irrigation water requirements of two crops were simulated using historical climate data and different levels of atmospheric CO2 (330, 550, 710 and 970 ppm), temperature (+1.1 and +6.4 °C) and precipitation (±5, ±10 and ±20%) chosen based on the Intergovernmental Panel on Climate Change (IPCC) AR4 projections under reference, B1, A1B1 and A1F1 emission scenarios. IRRs decreased as CO2 emission increased. The average percentage decrease in IRRs for seed corn is higher than that of coffee. However, runoff, rain canopy interception, and deep percolation below the root zone increased as precipitation increased. Canopy interception and drainage increased with increased CO2 emission. Evapotranspiration responded positively to air temperature rise, and as a result, IRRs increased as well. Further studies using crop models will predict crop yield responses to these different irrigation scenarios.

scholarly journals The Impact of Water Loss by Evaporation and Calcite Precipitation on the Sodium Adsorption Ratio (SAR) and an Alternative Method of Estimating the SAR of Irrigation Drainage Water

2020 ◽  
Author(s):  
Qiyu Zhou ◽  
William Bleam ◽  
Douglas Soldat
Keyword(s):  
Hazard Assessment ◽  
Water Loss ◽  
Irrigation Water ◽  
Drainage Water ◽  
Sodium Adsorption Ratio ◽  
Calcite Precipitation ◽  
Water Composition ◽  
Soluble Calcium ◽  
Irrigation Drainage ◽  
The Impact

Soil water loss by evaporation influences the sodium adsorption ratio (SAR) of irrigation drainage water. Evaporation concentrates sodium and magnesium but calcite precipitation has a more complicated effect on soluble calcium and alkalinity. Here we propose a revised sodicity hazard assessment that quantifies the impact of evaporative water loss and calcite precipitation on drainage water SAR. This paper shows sodicity hazard is determined by the initial composition of irrigation water as originally suggested by previous researchers, and provide a simple, accurate way to identify the potential sodicity hazard of any irrigation water. In particular, the initial equivalent concentration of alkalinity and calcium determine the salinization pathway followed during evaporation. If the irrigation water alkalinity exceeds soluble calcium expressed as equivalent concentrations, drainage water SAR approaches an upper limit determined by the initial relative concentration of sodium and magnesium. If irrigation water alkalinity is less than soluble calcium, drainage water SAR approaches a lower limit determined by the initial calcium, magnesium and sodium. In both cases the SAR is scaled by the square root of the concentration factor √Fc quantifying soil water loss. To assess the impact of evaporation and calcite precipitation on the SAR and test the accuracy of the new sodicity hazard assessment, we evaluated data from previously published lysimeter studies. We plotted water composition boundaries for each source water, comparing these boundaries to the drainage water composition recorded in the lysimeter studies. As salinity increased by evaporation, each drainage water followed a distinct salinization path.

Social Capital and Irrigation Water Management in Kafr al-Sheikh and Fayoum in the 1950s and 1960s

2016 ◽  
Author(s):  
Dalia M. Gouda
Keyword(s):  
Water Management ◽  
Social Capital ◽  
Irrigation Water ◽  
Irrigation Water Management ◽  
User Groups ◽  
The 1950S ◽  
Group Interviews ◽  
The 1960S ◽  
The Impact ◽  
The Village

This chapter covers the period from the 1950s to the 1960s based on the data collected from in-depth interviews with key informants, villagers, and state representatives as well as from group interviews. The first part identifies the actors of the village field, discusses their ability to exercise social capital functions, social control, and collective action, and examines the main social relationships that permitted the exercise of social capital functions. The second part analyzes the formation and functioning of informal water user groups in Kafr al-Sheikh and Fayoum at the mesqa level, examining the degree of autonomy of the irrigation water management field and the extent of the impact of the village field on irrigation water management in both governorates.

scholarly journals Was monochloramine responsible for widespread lettuce crop failures at a major recycled water irrigation scheme?

2013 ◽  
Vol 3 (2) ◽  
pp. 148-159
Author(s):  
S. F. Barker ◽  
R. Faggian ◽  
J. Blackbeard ◽  
G. Hepworth ◽  
A. J. Hamilton
Keyword(s):  
Environmental Conditions ◽  
Irrigation Water ◽  
High Salinity ◽  
Water Salinity ◽  
Recycled Water ◽  
Irrigation Scheme ◽  
Ambient Temperatures ◽  
Iceberg Lettuce ◽  
Irrigation Water Salinity ◽  
The Impact

In 2008, vegetable growers observed stunted lettuce plants showing signs of chlorosis and wilting. It was suspected that monochloramine in the recycled water used for irrigation, in combination with extreme environmental conditions (high irrigation water salinity and extreme heat), was responsible for these crop failures. A series of glasshouse studies was conducted to evaluate the impact of monochloramine concentration alone on iceberg lettuce seedlings, as well as in combination with high salinity and hot ambient temperatures. Monochloramine concentrations up to 9 and 15 mg L−1 Cl2 for continuous and initial irrigation only, respectively, did not affect the weight of iceberg lettuce heads (p > 0.05), while the combination of monochloramine (4–5 mg L−1 Cl2) and salinity (3,500 μS cm−1) did not significantly affect harvest measurements (p > 0.05). We therefore conclude that it is unlikely that monochloramine was responsible for the observed crop failures.

Irrigation water pricing policy for water demand and environmental management: a case study in the Weihe River basin

Water Policy ◽  
2013 ◽  
Vol 15 (5) ◽  
pp. 816-829 ◽  
Author(s):  
Fanus Asefaw Aregay ◽  
Zhao Minjuan ◽  
Zahra Masood Bhutta
Keyword(s):  
River Basin ◽  
Irrigation Water ◽  
Environmental Sustainability ◽  
Water Demand ◽  
Water Pricing ◽  
Pricing Policy ◽  
Weihe River ◽  
Weihe River Basin ◽  
The Impact ◽  
Irrigation Water Pricing

Irrigated agricultural production is the backbone of the Chinese agricultural sector, but the increasing demand for irrigation water, its inefficient utilization and overuse of chemical inputs, accompanied by the short supply of water resources have endangered the nation's agricultural and environmental sustainability. The Chinese government has proposed a water pricing policy with the expectation of improving the efficiency of utilizing irrigation water and fertilizer, to mitigate these problems. With the main objective of this paper being to assess the impact of this policy on water demand and environmental sustainability, a positive mathematical programming model was adopted to simulate different irrigation water pricing scenarios based on farm-level primary data from three irrigation districts along the Weihe River basin. The main parameter for assessing water demand was the change in total water consumption relative to the base year, while change in fertilizer consumption and water demand was determined to evaluate the impact of pricing policy on environment sustainability. According to the results, irrigation water demand and fertilizer consumption were mostly price inelastic to water pricing. This implies that water pricing policy can have only a minor role in regulating the water demand and environment in the region even when the base-year water price is doubled.

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