71 research outputs found
An Optimal Control Framework to Address the Relationship between Water Resource Management and Water-Borne Health Impacts: Focus on the Texas Lower Rio Grande Valley
The objective of this study is develop a theoretical model that can evaluate two types of public health expenditures on water-borne health risks: water-related municipal services, an ex ante preventative measure against water-borne contamination, and medical treatment, an ex post treatment of the water-borne pollutant’s harmful effects on human health. The modeled community can allocate resources in either centralized-municipal water-services, point-of-use water-services, or medical intervention, with expenditures subject to a budget constraint. The movement of a water-borne illness through the community is modeled with a susceptible-infected-susceptible (SIS) disease framework. An optimization framework is developed, including a statement of the problem’s Hamiltonian and first-order-conditions. The first-order-conditions are discussed. Future work includes obtaining a numerical solution to the optimization problem.water, public health, rural development, dynamic optimization, Community/Rural/Urban Development, Resource /Energy Economics and Policy,
Effect of Agricultural Activity on River Water Quality: A Case Study for the Lower Colorado River Basin
This case study investigates the effect of a change in cropping pattern involving expanded acres of crops for biofuel feedstock, on the discharge of nutrients to rivers. Annual data from 1968-2008 on stream flow, cropped acres, and precipitation for Wharton County, Texas are used. A positive impact of increased corn acreage over this period on river discharge is identified.Biofuels, Stream Flow, Discharge, Production Economics, Resource /Energy Economics and Policy,
Economic Implications of Desalination in South Texas
Desalination offers an opportunity for source diversification of water for many communities, along with possible defenses against security threats potentially affecting clean water supplies. The economic costs associated with constructing and operating desalination plants in South Texas are investigated. Primary data utilized in the analysis include engineering considerations and actual costs associated with existing and plants under construction in South Texas. Specific costs considered include raw water acquisition and transport, pretreatment, and purification. Sensitivity parameters include source and quality of raw water, energy costs, size of plant, and other heuristic aspects of plant design and development. Annuity equivalent costs are reported on a per ac-ft of finished water basis, f.o.b. desalination plant
Salinity Control by the El Morillo Drain, South Texas
Potential increased sodium loads in the Rio Grande associated with drainage from Mexican farmer fields is avoided due to the El Morillo Drain, located in Mexico. Random failures of the Drain threaten the quality of source water available to Rio Grande Valley municipal water treatment plants as well for agricultural irrigation of high value crops. Economic analysis and capital budgeting methods are utilized to analyze the impacts of cities having to add reverse osmosis treatment components to conventional municipal water treatment facilities to reduce the excessive sodium loads and be in compliance with water quality standards
Biological Control of Giant Reed (Arundo donax): Economic Aspects
Arundo donax is a large, invasive weed consuming large quantities of water in the riparian area of the Texas Rio Grande Basin. With water availability a concern to the area, the USDA-ARS is investigating biological control agents to increase available water, creating a benefit to both the region’s economy and society in general.Arundo donax, Giant Reed, Water, Economics, Invasive, Environmental Economics and Policy, Resource /Energy Economics and Policy,
Seawater Desalination for Municipal Water Production
This paper examines the optimal allocation of several inputs in the context of seawater desalination by reverse osmosis (RO) as a source of municipal (or commercial or industrial) water. A cost-minimization model is developed, a production function is estimated, and sensitivity analyses are conducted using the optimization model to investigate the effect of environmental conditions and economic factors on the optimal input portfolio and the cost of operating a modeled seawater desalination facility. The objectives of this paper are to better understand the effect on the seawater desalination facility’s costs and input portfolio from changes in water quality, membrane lifespan, daily operations schedule, and energy prices. Findings include that lower total facility costs are associated with warm-weather water quality parameters, longer membrane life, and mid-range daily operations schedule (14.265 hours/day). Under most conditions, an interruptible power supply regime reduces facility costs. Exceptions include when the interruptible power supply regime implies significant reductions in operating hours and the associated reduction in energy price is very small.water, production, seawater desalination, Resource /Energy Economics and Policy,
Economic and Conservation Evaluation of Capital Renovation Projects: Hidalgo County Irrigation District No. 1 (Edinburg) - North Branch / East Main - Final
Initial construction costs and net annual changes in operating and maintenance expenses are identified for a single-component capital renovation project proposed by Hidalgo County Irrigation District No. 1 to the Bureau of Reclamation and North American Development Bank. The proposed project involves installing 4.83 miles of multi-size pipeline to replace a segment of the North Branch / East Main canal. Both nominal and real estimates of water and energy savings and expected economic and financial costs of those savings are identified throughout the anticipated 48-year useful life for the proposed project. Sensitivity results for both the cost of water savings and cost of energy savings are presented for several important parameters.
Annual water and energy savings forthcoming from the total project are estimated, using amortization procedures, to be 5,838 ac-ft of water per year and 3,293,049,926 BTUs (965,138 kwh) of energy per year. The calculated economic and financial cost of water savings is estimated to be 0.0000392 per BTU (30.68 per ac-ft of water savings. The initial construction cost per BTU (kwh) of energy savings measure is 0.186 per kwh). The ratio of initial construction costs per dollar of total annual economic savings is estimated to be -1.58
Economic and Financial Costs of Saving Water and Energy: Preliminary Analysis for Hidalgo County Irrigation District No. 2 (San Juan) – Replacement of Pipeline Units I-7A, I-18, and I-22
Initial construction costs and net annual changes in operating and maintenance expenses
are identified for a three-component capital renovation project proposed by Hidalgo County
Irrigation District No. 2. The proposed project primarily consists of replacing aged mortar-joint
pipe in pipeline units I-7A, I-18, and I-22 with new rubber-gasketed, reinforced concrete pipe.
Both nominal and real estimates of water and energy savings and expected economic and
financial costs of those savings are identified throughout the anticipated useful life for the
proposed project. Sensitivity results for the cost of saving water are presented for several
important parameters.
Annual water and energy savings forthcoming from the total project are estimated, using
amortization procedures, to be 485 ac-ft of water per year and 179,486,553 BTUs {52,604 kwh}
of energy per year. The calculated economic and financial cost-of-saving water is estimated to
be 0.0010735 per BTU {3.663 per kwh}.
In addition, expected real (vs. nominal) values are provided for the U.S. Bureau of
Reclamation’s three principal evaluation measures specified in U.S. Public Law 106-576. The
aggregate initial construction cost per ac-ft of water saved measure is 510.92. The aggregate
initial construction cost per unit of energy saved measure is 0.0013798 per BTU {4.708 per
kwh}. The aggregate ratio of initial construction costs per dollar of total annual economic
savings is estimated to be -2.53
Economic and Conservation Evaluation of Capital Renovation Projects: United Irrigation District of Hidalgo County (United) – Rehabilitation of Main Canal, Laterals, and Diversion Pump Station – Final
Initial construction costs and net annual changes in operating and maintenance expenses
are identified for a three-component capital renovation project proposed by the United Irrigation
District to the U.S. Bureau of Reclamation (USBR). The proposed project involves: installing
4.66 miles of pipeline in the Main Canal and Lateral 7N, installing 13.46 miles of pipeline in
several laterals and sub-laterals, and rehabilitating the District’s Rio Grande diversion pumping
plant. Both nominal and real estimates of water and energy savings and expected economic and
financial costs of those savings are identified throughout the anticipated useful lives for all three
components. Sensitivity results for both the cost of saving water and the cost of saving energy
are presented for several important parameters.
Annual water and energy savings forthcoming from the total project are estimated, using
amortization procedures, to be 1,522 ac-ft of water per year and 3,520,302,471 BTUs
(1,031,742 kwh) of energy per year. The calculated economic and financial cost of saving water
is estimated to be 0.0001574 per BTU (359.42 per ac-ft of water savings. The
aggregate initial construction cost per BTU (kwh) of energy savings measure is 1.183 per kwh). The aggregate ratio of initial construction costs per dollar of total annual
economic savings is estimated to be -3.551
Economic and Conservation Evaluation of Capital Renovation Projects: United Irrigation District of Hidalgo County (United) - Rehabilitation of Main Canal, Laterals, and Diversion Pump Station - Preliminary
Initial construction costs and net annual changes in operating and maintenance expenses are identified for a three-component capital renovation project proposed by the United Irrigation District to the U.S. Bureau of Reclamation (USBR). The proposed project involves: installing 4.66 miles of pipeline in the Main Canal and Lateral 7N, installing 13.46 miles of pipeline in several laterals and sub-laterals, and rehabilitating the District’s Rio Grande diversion pumping plant. Both nominal and real estimates of water and energy savings and expected economic and financial costs of those savings are identified throughout the anticipated useful lives for all three components. Sensitivity results for both the cost of saving water and the cost of saving energy are presented for several important parameters.
Annual water and energy savings forthcoming from the total project are estimated, using amortization procedures, to be 1,409 ac-ft of water per year and 4,506,882,727 BTUs (1,320,892 kwh) of energy per year. The calculated economic and financial cost of saving water is estimated to be 0.0001113 per BTU (354.30 per ac-ft of water savings. The aggregate initial construction cost per BTU (kwh) of energy savings measure is 1.152 per kwh). The aggregate ratio of initial construction costs per dollar of total annual economic savings is estimated to be -3.442
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