O meio ambiente na Constituição de 1988 : sobrevôo por alguns temas vinte anos depois / Marcelo Dias Varella e Márcia Dieguez Leuzinger.

"Edição especial em comemoração aos vinte anos de promulgação da Constituição de 1988".

Irrigation canals in a semi-arid agricultural landscape surrounded by wetlands: Their role as a habitat for birds during the breeding season

Traditional water supply systems in semi-arid agrarian ecosystems, mainly irrigation canals, contribute to the diversity of the landscape and influence the composition of species. To evaluate their effect on bird communities in the breeding season, we selected a rural area in southeastern Spain, where an intricate and extensive network of irrigation canals and cultivated areas is located between two wetlands declared as Natural Parks. Birds were counted at representative points distributed throughout the canal network at which we recorded several variables related to the physical features, the vertical and horizontal structure of associated vegetation, reed development (Phragmites australis) and land use in the neighboring areas. We detected 37 bird species, most of which were also breeding in the wetlands nearby. We used Hierarchical Partitioning analyses to identify the variables most strongly related to the probability of the presence of selected species and species richness. Vegetation cover and height close to the canals, together with reed development, were the most important types of variables explaining species presence and richness. We found that current management practices for reeds in canals are not well-suited for biodiversity conservation. We therefore propose alternatives that could be implemented in the area in cooperation with stakeholders.

The prediction of tidal flows in canals and estuaries /

Mode of access: Internet.

A treatise on the law of waters, and of sewers : including the law relating to rights in the sea, and rights in rivers, canals, dock companies, fisheries, mills, watercourses, &c. /

Includes bibliographical footnotes and index.

A treatise of the law of waters; including the law relating to rights in the sea, and rights concerning rivers, canals, dock companies, fisheries, mills, water-courses, &c. with a note concerning the rights of the Crown to the land between high and low water mark.

"The law of sewers has been separately published in a second edition, and is, therefore, withdrawn from this second edition of the Law of waters."--2d prelim. leaf.

An analytical model to predict ship transit capacities of sea-level canals /

See errata at end of item for cover, foreward, pages 26 and 29, and Form 1473.

Canals & inland navigation,

Reprinted (by permission) from "The Engineer."

The law relating to traffic on railways and canals,

Mode of access: Internet.

A project for canals of irrigation and navigation from the River Soane in south Behar; with plans and estimates.

Mode of access: Internet.

Annual report ... on the canals of the state ... and on the trade and tonnage of the canals ...

Report on trade and tonnage covers the "season," usually May to November.

Measuring seepage loss in irrigation canals : (tentative procedures for ponding and seepage meter tests) /

Mode of access: Internet.

Capacity testing in large canals of the Central Valley Project /

Mode of access: Internet.

Spillways for reservoirs and canals /

Mode of access: Internet.