TEST AV MoST – ETT NYTT VERKTYG FÖR KVALITETSSÄKRING AV MODELLERING INOM AVRINNINGSOMRÅDEN / A test of MoST – a new tool for quality assurance of catchment-based modelling
HarmoniQuA is an EU-project aiming at developing a quality assurance component for catchment-based modelling according to the EU Water Framework Directive. The two major outputs are (1) a harmonised, generic methodology with guidelines for “good modelling practice” and (2) a web-based toolbox for quality assurance support (MoST). To test the methodology and the toolbox, they […]
HISTORY OF MINING IN THE LAKE POOPO REGION AND ENVIRONMENTAL CONSEQUENCES
Bolivia is a country with many mineral resources, located mainly in the Andean region of this country, where the lake Poopo is located. From thousands of years ago, the mining activity has a large importance; however, the natives used these resources formerly for ceremonial use and taking care with the environment. From the colonial time, […]
VATTENFÖRVALTNINGEN OCH AKTÖRSDELTAGANDET I TYSKLAND / Water management and public participation in Germany
This article intends to describe how the German federal states (Bundesländer) chose to implement the public participation requirements (article 14) of the water framework directive (WFD). We describe which level of ambition they intend to reach, which models and tools they use and what kind of resources they have at their disposal to involve external […]
SOME NOTES ON HYDRAULICS AND A MATHEMATICAL DESCRIPTION OF SLOW SAND FILTRATION
Reliable mathematical models that can describe the mechanisms in Slow Sand Filters, SSF, represented by different filter parameters are yet absent. The extremely complicated interactions between physical, chemical, biological and hydraulic conditions are shown in a simplified model. An attempt to apply the rapid filtration empirical formulas for SSF is described in detail. The need […]
BORTPUMPNING AV SJÖARS BOTTENVATTEN FÖR ATT MINSKA INTERNBELASTNINGEN AV FOSFOR Erfarenheter från Bornsjön / Hypolimnetic withdrawal to reduce internal phosphorus loading in lakes Experiences from Lake Bornsjön
Eutrophication of lakes is a serious problem, especially in agricultural areas. It is mainly due to external and internal loads of phosphorus (P), which increase the P concentration in the lake water. Lake Bornsjön is a reserve source of water supply for Stockholm and is located 25 km southwest of the city. Maximum yearly concentration […]
PARTIAL NITRITATION PROCESS ASSESSMENT
In this study, partial nitritation has the aim to oxidise a fraction of ammonium (about 50–60 %) into nitrite without following oxidation to nitrate. Experiments performed during eight months describe partial nitritation of supernatant from dewatering of digested sludge at Himmerfjärden wastewater treatment plant in the south Stockholm region. The process was the first step […]
NÄRINGSÄMNESRETENTION I EN ANLAGD VÅTMARK – EN INTENSIVSTUDIE AV ORMASTORP S / Nutrient retention in a constructed wetland – case study South Ormastorp
South Ormastorp is a constructed wetland in the Råå river catchment area located in the northwest of Skåne. The aim of the wetland is to decrease the diffuse leaching of nutrients from Råå river to Öresund. During three weeks South Ormastorp was intensively studied. Runoff was continuously measured and water samples were collected daily (Monday–Friday), […]
Om förekomst av bekämpningsmedelsrester i grundvatten:erfarenheter från simrishamn kommun 2002–2007 / Monitoring of pesticides in rawwater wells in Simrishamn
In January 2007, all municipal water wells of Simrishamn, south Sweden, were sampled and analyzed for the presence of pesticide residuals. In total 34 wells were analyzed. The samples were analyzed at an accredited laboratory with respect to 77 different parameters of pesticides which either are used or have been used in the recharge area […]
Hydraulic capacity of 2in1 sewers
It is today possible to have an extra pipe installed in an existing sewer with traditional cured in place (CIPP) technology. Such an installation will affect the capacity of the sewer. The cross sectional area will decrease and the hydraulic radius will increase which decreases the capacity. The new liner will have a smother surface, […]
Vågdämpning i bestånd av vass (Phragmites australis) / Wave attenuation in stands of common reed (Phragmites australis)
Common reed is found in near-shore areas of many European lakes, where it frequently forms dense stands. In order to evaluate the effects of common reed stands on waves and to test a model for wave attenuation caused by vegetation, a field experiment was conducted in the common reed stands of a southern Swedish lake. […]