Performance, environmental and cost comparisons of onsite detention (OSD) and onsite retention (OSR) in re-developed residential catchments

1999 ◽  
Vol 39 (2) ◽  
pp. 33-41 ◽  
Author(s):  
Peter Scott ◽  
Ruben Santos ◽  
John R. Argue
Keyword(s):  
Peak Flow ◽  
Storm Runoff ◽  
Environmental Benefits ◽  
Flood Wave ◽  
Environmental Aspects ◽  
Urban Flood ◽  
Peak Flows ◽  
Temporary Storage ◽  
Urban Catchments ◽  
Global Peak

On-site detention (OSD) of storm runoff decreases catchment peak flows through the routing effect of temporary storage; on-site retention (OSR) achieves the same objective by abstracting part of the urban flood wave and passing the retained water to disposal on site. The investigation explored both strategies applied to a set of hypothetical present/re-developed urban catchments ranging in size from 14 ha to 210 ha. Comparisons were made on the basis of site storage required (SSR) to achieve the same global peak flow reductions, environmental aspects and cost. OSR practice was shown to out-perform OSD generally in medium-large catchments with respect to SSR and, hence, cost. The retention option also has clear environmental benefits that fall beyond the scope normally ascribed to OSD practice. The paper cautions against use of OSR in unsuitable circumstances.

Rainfall Events as Paths of a Stochastic Process: Problems of Design Storm Analysis

1984 ◽  
Vol 16 (8-9) ◽  
pp. 131-138 ◽  
Author(s):  
Johannes Brummer
Keyword(s):  
Stochastic Process ◽  
Peak Flow ◽  
Rainfall Events ◽  
Peak Flows ◽  
Design Storm ◽  
Adequate Evaluation ◽  
Rainfall Patterns

Problems in the construction of design storms are expressed in mathematical terms. Introduced here is a concept for approximating natural peak flow values by means of the distribution of typical rainfall patterns. A comparison demonstrates the quality of this concept and the competency of some well-known design storms for the adequate evaluation of peak flows.

scholarly journals Economic and environmental aspects of technologies for surface treatment of selected wood-based composites

BioResources ◽  
2021 ◽  
Vol 16 (2) ◽  
pp. 2696-2713
Author(s):  
Katarzyna Mydlarz ◽  
Sławomir Mydlarz ◽  
Marek Wieruszewski
Keyword(s):  
Surface Treatment ◽  
Environmental Regulations ◽  
Refining Process ◽  
Environmental Benefits ◽  
Environmental Aspects ◽  
Application Technology ◽  
Advanced Technologies ◽  
Market Opportunities ◽  
Market Needs

Research for new solutions in the field of wood-based materials and possibilities of their refinement is prompted by both market needs and increasingly restrictive environmental regulations. Many opportunities in this area are created by modern industrial technologies and constantly improved varnishing products as well. The observed trend indicating the usage of increasingly advanced technologies for the refining of wood-based materials in plants producing these composites confirms such activities and it creates new market opportunities. The correlations between the consumption of varnishing materials and the VOC index depending on the application technology were established. The economic and environmental benefits of the refining process concerning wood-based materials in their production plants were shown for both the manufacturers of the refinished composites and their buyers.

scholarly journals The use of NRCS synthetic unit hydrograph and Wackermann conceptual model in the simulation of a flood wave in an uncontrolled catchment/ Zastosowanie syntetycznego hydrogramu jednostkowego NRCS oraz konceptualnego modelu Wackermana do symulacji fali wezbraniowej w zlewni niekontrolowanej

2014 ◽  
Vol 23 (1) ◽  
pp. 53-59 ◽  
Author(s):  
Izabela Pietrusiewicz ◽  
Agnieszka Cupak ◽  
Andrzej Wałęga ◽  
Bogusław Michalec
Keyword(s):  
Conceptual Model ◽  
Peak Flow ◽  
Engineering Calculation ◽  
Point Of View ◽  
Flood Wave ◽  
Unit Hydrograph ◽  
Concentration Time ◽  
Synthetic Unit Hydrograph ◽  
Calculation Point ◽  
Different Levels

Abstract The paper presents the results of using two models: a conceptual model of Wackermann and a NRCS-UH synthetic unit hydrograph, for flow calculation in uncontrolled catchment of the Słonka, Poland. These models were chosen because of simplicity of models’ parameters evaluation, what is important from engineering calculation point of view. Flows with the probability of exceed amounting to 0.5%, 1%, 2%, 5%, 10%, 20%, and 50% and for different levels of the catchment moisture were evaluated. The flood waves generated in the Wackermann model were characterized by a short duration (over 2 hours), shorter concentration time (about 1 hour), and by about 70% higher peak flow values than those generated using the NRCS-UH method. A common feature of both methods were higher values of peak flows for the third level of the catchment moisture, as compared to the second level. It is also worth noticing that in both methods no flood wave was generated for the probabilities of 10, 20 and 50% and for the second level of the catchment moisture. It was assumed that hydrographs made with use Wackermann model better describe flood wave in mountain river, which Słonka is.

scholarly journals Possibility of Using Selected Rainfall-Runoff Models for Determining the Design Hydrograph in Mountainous Catchments: A Case Study in Poland

Water ◽  
2020 ◽  
Vol 12 (5) ◽  
pp. 1450 ◽  
Author(s):  
Dariusz Młyński ◽  
Andrzej Wałęga ◽  
Leszek Książek ◽  
Jacek Florek ◽  
Andrea Petroselli
Keyword(s):  
Catchment Area ◽  
Peak Flow ◽  
Rainfall Runoff ◽  
Peak Flows ◽  
Mountainous Catchment ◽  
Mountainous Catchments ◽  
Relative Errors ◽  
Runoff Hydrographs

The aim of the study was to analyze the possibility of using selected rainfall-runoff models to determine the design hydrograph and the related peak flow in a mountainous catchment. The basis for the study was the observed series of hydrometeorological data for the Grajcarek catchment area (Poland) for the years 1981–2014. The analysis was carried out in the following stages: verification of hydrometeorological data; determination of the design rainfall; and determination of runoff hydrographs with the following rainfall-runoff models: Snyder, NRCS-UH, and EBA4SUB. The conducted research allowed the conclusion that the EBA4SUB model may be an alternative to other models in determining the design hydrograph in ungauged mountainous catchments. This is evidenced by the lower values of relative errors in the estimation of peak flows with an assumed frequency for the EBA4SUB model, as compared to Snyder and NRCS-UH.

scholarly journals Methodologies to study the surface hydraulic behaviour of urban catchments during storm events

2011 ◽  
Vol 63 (11) ◽  
pp. 2666-2673 ◽  
Author(s):  
M. Gómez ◽  
F. Macchione ◽  
B. Russo
Keyword(s):  
Urban Areas ◽  
Flood Hazard ◽  
Spatial Density ◽  
Hydraulic Efficiency ◽  
Storm Events ◽  
Accurate Analysis ◽  
Numerical Application ◽  
Urban Flood ◽  
Hydraulic Behaviour ◽  
Urban Catchments

A good knowledge of the hydraulic behaviour of an urban catchment and its surface drainage system is an essential requirement to guarantee traffic and pedestrian safety. In many cases, inlets have been situated according to spatial density criteria. Indeed a more rational location of inlets on urban catchments must be defined according to an accurate analysis of the relationship between street flow and inlet hydraulic efficiency. Moreover we lack specific hazard criteria in terms of the maximum acceptable flow depths and velocities on the streets that do not cause problems to pedestrians. In this paper the results of two different experimental campaigns are presented. The first was carried out to evaluate inlet hydraulic efficiency; the second was carried out to address the pedestrian stability in urban flood conditions, whose aim was to propose new hazard criteria. On the basis of the experimental results, a methodology was developed to assess flood hazard in urban areas during storm events. If a refined topographic representation of urban areas is available, a two-dimensional numerical simulation of urban flooding can be performed using complete shallow water equations. According to this approach a numerical application for flood hazard assessment in a street of Barcelona is shown.

scholarly journals Examining the effects of urban agglomeration polders on flood events in Qinhuai River basin, China with HEC-HMS model

2017 ◽  
Vol 75 (9) ◽  
pp. 2130-2138 ◽  
Author(s):  
Yuqin Gao ◽  
Yu Yuan ◽  
Huaizhi Wang ◽  
Arthur R. Schmidt ◽  
Kexuan Wang ◽  
...  
Keyword(s):  
River Basin ◽  
Flood Control ◽  
Peak Flow ◽  
Urban Agglomeration ◽  
Flood Events ◽  
Peak Flows ◽  
Flood Volume ◽  
Control Pattern ◽  
The Impact ◽  
Qinhuai River

The urban agglomeration polders type of flood control pattern is a general flood control pattern in the eastern plain area and some of the secondary river basins in China. A HEC-HMS model of Qinhuai River basin based on the flood control pattern was established for simulating basin runoff, examining the impact of urban agglomeration polders on flood events, and estimating the effects of urbanization on hydrological processes of the urban agglomeration polders in Qinhuai River basin. The results indicate that the urban agglomeration polders could increase the peak flow and flood volume. The smaller the scale of the flood, the more significant the influence of the polder was to the flood volume. The distribution of the city circle polder has no obvious impact on the flood volume, but has effect on the peak flow. The closer the polder is to basin output, the smaller the influence it has on peak flows. As the level of urbanization gradually improving of city circle polder, flood volumes and peak flows gradually increase compared to those with the current level of urbanization (the impervious rate was 20%). The potential change in flood volume and peak flow with increasing impervious rate shows a linear relationship.

scholarly journals Climate or land cover variations: what is driving observed changes in river peak flows? A data-based attribution study

2019 ◽  
Vol 23 (2) ◽  
pp. 871-882 ◽  
Author(s):  
Jan De Niel ◽  
Patrick Willems
Keyword(s):  
Climate Change ◽  
Land Cover ◽  
Peak Flow ◽  
Hydrological Cycle ◽  
Interaction Effects ◽  
Land Cover Changes ◽  
Climate Variations ◽  
Peak Flows ◽  
Catchment Characteristics ◽  
Flows Over Time

Abstract. Climate change and land cover changes are influencing the hydrological regime of rivers worldwide. In Flanders (Belgium), the intensification of the hydrological cycle caused by climate change is projected to cause more flooding in winters, and land use and land cover changes could amplify these effects by, for example, making runoff on paved surfaces faster. The relative importance of both drivers, however, is still uncertain, and interaction effects between both drivers are not yet well understood. In order to better understand the hydrological impact of climate variations and land cover changes, including their interaction effects, we fitted a statistical model for historical data over 3 decades for 29 catchments in Flanders. The model is able to explain 60 % of the changes in river peak flows over time. It was found that catchment characteristics explain up to 18 % of changes in river peak flows, 6 % of changes in climate variability and 8 % of land cover changes. Steep catchments and catchments with a high proportion of loamic soils are subject to higher peak flows, and an increase in urban area of 1 % might cause increases in river peak flows up to 5 %. Interactions between catchment characteristics, climate variations and land cover changes explain up to 32 % of the peak-flow changes, where flat catchments with a low loamic soil content are more sensitive to land cover changes with respect to peak-flow anomalies. This shows the importance of including such interaction terms in data-based attribution studies.

Impact of Concrete Recycled Materials on some Properties of Concrete

2014 ◽  
Vol 899 ◽  
pp. 399-402
Author(s):  
Miriam Ledererova
Keyword(s):  
Construction Materials ◽  
Optimal Solution ◽  
Environmental Issues ◽  
Environmental Benefits ◽  
Environmental Aspects ◽  
Demolition Waste ◽  
Recycled Materials ◽  
Basic Characteristics ◽  
To Come ◽  
Building Demolition

Recycling building demolition waste in addition to environmental benefits is also economically interesting. In addressing the environmental issues it is recommended to give priority to recovery and rational utilization of waste with regard to their basic characteristics before disposal respectively storage. Issue of the use of recycled materials in concrete structures and their disposal in the world and in our longer pays much attention. Use and recycling of construction materials is a great asset for more prospective and progressive methods of construction waste utilizations. The program focused on waste management is therefore necessary to reconcile economic and environmental aspects in order to come to an optimal solution of the issue of waste and environmental protection.

scholarly journals Outcomes of COPD Exacerbations Treated with Corticosteroids, Antibiotics, or Both

2011 ◽  
Vol 2011 ◽  
pp. 1-6 ◽  
Author(s):  
Christopher B. Remakus ◽  
Francis Cordova ◽  
David Ciccolella ◽  
A. James Mamary ◽  
Matthew R. Lammi ◽  
...  
Keyword(s):  
Treatment Failure ◽  
Standard Treatment ◽  
Peak Flow ◽  
Daily Diary ◽  
Symptom Index ◽  
Peak Flows ◽  
Copd Exacerbations ◽  
Acute Exacerbations ◽  
Antibiotic Group ◽  
Trigger Algorithm

Background. The outcomes for outpatient treatment of acute exacerbations of COPD (AECOPD) are poorly described. Design. The results of a daily diary recording symptoms and peak flows were compiled into a severity score to trigger algorithm-based treatments and a symptom index to follow treatment response. Treatment failure (symptom index failing to return to baseline for 2 consecutive days or hospitalization within 21 days) was the main outcome. Results. Twenty-two patients (FEV1 0.81 ± 0.26 L) were treated for 115 AECOPDs (corticosteroids = 36, antibiotics = 41, corticosteroids/antibiotics = 38). Treatment failure was 50% for the corticosteroid/antibiotic compared to 28% () for the corticosteroid and 34% () for the antibiotic group. Patients suffering from AECOPDs treated with corticosteroids had dyspnea, wheezing, and decreased peak flow; those treated with antibiotics had sputum symptoms; those treated with corticosteroids/antibiotics had dyspnea, wheezing, sputum symptoms, and decreased peak flows. Conclusions. AECOPDs with both dyspnea and sputum symptoms are more refractory to standard treatment and likely require closer monitoring.

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