Productivity and Efficiency

According to the U.S. Environmental Protection Agency, water efficiency is the smart use of our water resources through water-saving technologies and simple steps. Using water efficiently will help ensure reliable water supplies today and for future generations. Topics addressed in this theme provide insights, lessons, and guidance on how diverse stakeholders are working to improve water management and reduce water use.

Productivity and Efficiency Resources

Phosphorus Dynamics in Ponds

Published: 
January 1, 1971
U.S. Agency for International Development
Phosphorus is generally recognized as a key nutrient in the fertility of fish ponds. This nutrient frequently limits plant production and ultimately influences fish production. Conversely, too much phosphorus is sometimes responsible for excessive production of blue-green algae or other nuisance...Read more

Limnological Role of Aquatic Macrophytes and Their Relationship to Reservoir Management

Published: 
January 1, 1971
U.S. Agency for International Development
Reservoir biologists often consider aquatic macrophytes an undesirable form of primary production. Techniques for controlling macrophytes have limited effectiveness. A consideration of recent research indicates that a balance between phytoplankton and macrophyte production is desirable in most...Read more

Digestibility of Nutrients in Semi-Purified Rations By Channel Catfish in Stainless Steel Troughs

Published: 
January 1, 1971
U.S. Agency for International Development
The digestibility of nutrients in six semi-purified rations containing variable levels of protein, cellulose and starch by channel catfish in troughs was evaluated by using chromium oxide as an inert reference in the feeds. Excreta were collected using an indirect trough collection method and a...Read more

Project Adelanto, Nicaragua 1968-70: a Project for Irrigation Development: Final Report

Published: 
November 1, 1970
U.S. Agency for International Development
This report details irrigation practices in Nicaragua which were undertaken with USAID assistance between 1968-1970. It highlights the project successes and opportunities including finance, sustainability, adoption by local farmers, irrigation costs, impacts on local water resources, and local...Read more
Regional focus: 
Latin America and the Caribbean

Evaluation of Balance Between Fishes and Available Fish Foods in Multi-Species Fish Culture Ponds in Taiwan

Published: 
October 1, 1970
U.S. Agency for International Development
Evaluation of the condition of balance between fishes and available fish foods in impoundments of multispecies fish culture in Taiwan was made by analyzing the quantitative interrelations between the standing crop of fish food biota and the stocked fishes of ecologically different species in a 6...Read more
Regional focus: 
ThailandEast Asia and Pacific

Desert Strip Farming, a Modified Dry Farming Method Using Rainfall Multiplication

Published: 
July 1, 1970
U.S. Agency for International Development
Reviews progress to date on a runoff distribution strategy in which rain water is harvested in collectors and then channeled to nearby crop areas. The report explains that an inexpensive short-distance irrigation method is badly needed in sunny, potentially arable regions where the limited rainfall...Read more

Optimum Utilization of Water Resources for Agriculture, With Emphasis on Farm Water Management; Annual Technical Report, 1969/1970

Published: 
June 30, 1970
U.S. Agency for International Development
This document is an annual technical report on optimum utilization of water resources for agriculture, with emphasis on on-farm water management.Read more
Regional focus: 
Latin America and the Caribbean

Report to the Government of India on Design Criteria Construction Guide, and Material Standards for Irrigation Pipelines

Published: 
May 1, 1970
U.S. Agency for International Development
this report documents the findings and recommendations of the author who was engaged as a consultant to USAID and the government of India for a four-month period to determine what is being done in the sphere of irrigation pipelines and to appraise and make recommendations for improvement. The...Read more
Regional focus: 
IndiaSouth East Asia

Helmand-Arghandab Regional Development Project and Improvement of Existing Irrigation Systems Project: Quarterly Progress Report

Published: 
April 1, 1970
U.S. Agency for International Development
This document describes the quarterly progress of the U.S. Bureau of Reclamation's irrigation project in the Kandahar region in 1970. It highlights specific progress updates on several canals related to the project.Read more
Regional focus: 
AfghanistanSouth East Asia

Vascular Aquatic Plants for Mineral Nutrient Removal from Polluted Waters

Published: 
March 1, 1970
U.S. Agency for International Development
Aquatic plants have potential as feedstuffs in certain nations, but the economics of harvesting and processing would prohibit their direct utilization as a forage in technologically advanced nations. However, nutrient pollution is accelerating rates of eutrophication of natural waters in many areas...Read more

Don't see what you're looking for? You can search USWP member sites, request a resource, or contact the USWP.