scholarly journals The Ogallala aquifer in the northern High Plains of Colorado - saturated thickness in 1980; saturated-thickness changes, predevelopment to 1980; hydraulic conductivity; specific yield; and predevelopment and 1980 probable well yields

10.3133/ha671 ◽  
1983 ◽  
Keyword(s):  
Hydraulic Conductivity ◽  
Specific Yield ◽  
High Plains ◽  
Ogallala Aquifer ◽  
Saturated Thickness

scholarly journals Soil water management problems using fuzzy arithmetic

2013 ◽  
Vol 11 (4) ◽  
pp. 556-565
Keyword(s):  
Hydraulic Conductivity ◽  
Uncertain Data ◽  
Triangular Fuzzy Number ◽  
Effective Porosity ◽  
Specific Yield ◽  
Fuzzy Arithmetic ◽  
Two Dimensional ◽  
Fuzzy Analysis ◽  
Management Problems ◽  
Α Level

Drainage management problems are usually very hard to simulate due to the uncertainty of the hydraulic parameters involved. Fuzzy analysis is one of the available tools that can be used for such problems, involving uncertain data. A fuzzy analysis approach usually involves the consideration of several α-level cuts and an analytical approach or an explicit scheme approach for the PDE's discretization. Several application examples of this approach are listed in the literature, including uncertainty in hydraulic conductivity, specific yield, transmissivities, porosities, dispersivities, and deoxygenation rate coefficient. A methodology for the simulation of drainage problem having vague values of hydraulic parameters is introduced in this paper, and an analytical solution for a two-dimensional drainage application is presented. The two-dimensional problem of drainage is handled using fuzzy analysis by defining the hydraulic conductivity K as a triangular fuzzy number (TFN). The method of interval analysis is used in all the α-level cut examples. A solution is obtained using eleven α-level cuts and also solutions for two, three, and five α-level cuts are presented. Trials for different values of effective porosity are also performed. Finally conclusions on the necessary number of α-cuts utilized for drainage problems are drawn.

scholarly journals Groundwater Policy Research: Collaboration with Groundwater Conservation Districts in Texas

2011 ◽  
Vol 43 (3) ◽  
pp. 345-356 ◽  
Author(s):  
Jeffrey W. Johnson ◽  
Phillip N. Johnson ◽  
Bridget Guerrero ◽  
Justin Weinheimer ◽  
Steve Amosson ◽  
...  
Keyword(s):  
Water Policy ◽  
Research Collaboration ◽  
Policy Research ◽  
Farm Income ◽  
Ogallala Aquifer ◽  
Economic Activities ◽  
Collaborative Studies ◽  
Unique Nature ◽  
Regional Water ◽  
Saturated Thickness

The unique nature of the Ogallala Aquifer presents interesting and confounding problems for water policymakers who are coping with changing groundwater rules in Texas. The purpose of this article is to link previous efforts in water policy research for the Ogallala Aquifer in Texas with current collaborations that are ongoing with regional water planners. A chronological progression of economic water modeling efforts for the region is reviewed. The results of two recent collaborative studies are presented that provide estimates of impacts of alternative policies on groundwater saturated thickness, water use, net farm income, and regional economic activities.

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