Human activities have begun to transform northern peatlands into global sources of dissolved organic carbon (DOC). In Estonia, there are 10,091 km of peatlands, constituting 22.3% of the country’s total area. The increasing number of drought days during the last 50 years, which constitutes a threat of an increased flux of dissolved carbon, has also been observed in Estonia. The aim of the curre...

A simplified sewer nework modelling approach based on the hybrid linear systems framework is discussed. It involives both continuous and discrete variables to include a novel approximation of the overflow and flow over weirs phenomena. The model is validated against data provided by a simulator based on a physical model and is shown to be easily adapted to an optimal/predictive control setting ...

An increase in seawater that experiences high tides can cause tidal flooding. Tidal flooding the Semarang area requires quick and precise handling, so an emergency dam is needed to deal with overflow or This study discusses Knock-Down weir as a practical weir. also aims test shear stability of model against wall roughness based on variations soil types, namely: masonry, gravel, sand, clay. The ...

Accurate measurement of stream flow is an important component of environmental water quality monitoring. Flow rates in small streams can be conveniently monitored using weirs. The objective of this study was to design, install, and calibrate a series of permanent compound weirs for use in monitoring flow and water quality in a first order riparian wetland stream that exhibited great variability...

Environmentally friendly nature and the direct impact of gabion weirs on the quality parameters of rivers as well as simple design and construction of such structures, has putted them under consideration in the recent years. In this research, Hydraulic parameters of gabion crump weirs including water surface profile, discharge coefficient and through flow discharge are investigated numerically ...

P. Novak, Consultant In his paper the author has made a very useful contribution to the subject of prediction of oxygen content downstream of spillways, particularly in the case of surface aeration. However, some of the analysis referring to previously published results of oxygen uptake at hydraulic structures is not always rigorous enough. 40. The equations quoted for Avery and Novak apply to ...

The Piano Key weir (PKW) is a hydraulically attractive alternative to linear overflow weirs, increasing the unit discharge for similar heads and spillway widths. This advantage allows operating dam reservoirs on an increased level and provides thereby an enhanced retention volume. It is a result of the non-linear nature of PKWs being folded back and forth to make repeating cycles or keys. As PK...