Optimisation of operational management practices for the detention basins

2001 ◽  
Vol 44 (2-3) ◽  
pp. 277-285 ◽  
Author(s):  
C. Jacopin ◽  
E. Lucas ◽  
M. Desbordes ◽  
P. Bourgogne
Keyword(s):  
Management Practices ◽  
Stormwater Treatment ◽  
Rainfall Events ◽  
Control Schemes ◽  
Operational Management ◽  
Detention Basins ◽  
Current Operation ◽  
Flooding Risk ◽  
Settling Process ◽  
Experimental Basins

The objective of this study is to develop new operational management practices for detention basins during rainfall events in order to limit flooding risk and, at the same time, to reduce pollutant discharges by optimising the settling process. For this work, a methodology was developed to study the integration of the stormwater treatment into existing detention structures. In this article, it was applied on two experimental sites. The current operation of the basins and “on/off” regulation studies were first carried out to quantify the freedom to act to change the control schemes. Relying on the support of these studies, new operational rules based on the current or “on/off” principle were then elaborated and tested on the experimental basins using a hydraulic model. Finally, their efficiency to protect against flooding and to reduce pollutant discharges was assessed.

Characterisation and settling of solids in an open, grassed, stormwater sewer network detention basin

1999 ◽  
Vol 39 (2) ◽  
pp. 135-144 ◽  
Author(s):  
Ch. Jacopin ◽  
J. L. Bertrand-Krajewski ◽  
M. Desbordes
Keyword(s):  
Management Practices ◽  
Sediment Traps ◽  
Sewer System ◽  
Rainfall Events ◽  
Detention Basin ◽  
Fine Grain ◽  
Combined Sewer ◽  
Flooding Risk ◽  
Flooding Events ◽  
Settling Process

The objective of the study is to develop new operational management practices for detention tanks during rainfall events in order to limit flooding risk and, at the same time, to reduce pollutant discharges by optimising the settling process. This paper presents the results of the characterisation of settled particles in an open stormwater detention basin with grassed banks and bottom, installed on a separate stormwater network. Solids sampled in the bottom of the basin where the settling process is frequent and solids collected in sediment traps have a fine grain-size distribution close to those of suspended solids in stormwater. The distribution is related to the number and the duration of the flooding events. The pollutant loads are significant but the hydrocarbons and heavy metals concentrations are lower than concentrations measured in solids sampled in detention tanks situated on a combined sewer system.

scholarly journals Smart In-Line Storage Facilities in Urban Drainage Network

Proceedings ◽  
2018 ◽  
Vol 2 (11) ◽  
pp. 631 ◽  
Author(s):  
Nils Kändler ◽  
Ivar Annus ◽  
Anatoli Vassiljev ◽  
Raido Puust ◽  
Katrin Kaur
Keyword(s):  
Best Management Practices ◽  
Management Practices ◽  
Storage System ◽  
Low Impact Development ◽  
Control Measures ◽  
Real Time Control ◽  
Rainfall Events ◽  
Best Management ◽  
Time Control ◽  
Development Area

Urban stormwater drainage systems (UDS) are severely affected by the changing climate bringing along inter alia more intense rainfall events. The conduits, usually having limited capacity, are unable to cope with these excessive flowrates. Therefore, measures must be undertaken to temporarily accumulate extra flowrates in order to avoid the flooding. There are several options available to tackle this challenge, e.g., low impact development (LID) solutions, best management practices (BMP), stormwater real-time control measures (RTC). In this study the efficiency of in-line and off-line detention tanks are analyzed. Moreover, new concept of smart in-line storage system is created and evaluated. This solution shows significant reduction in peak flow, economic benefit and is particularly suitable for the districts with limited construction space. The concept has been successfully tested in 10 ha dense urban development area in Estonian capital Tallinn.

THE IMPACT OF HUMAN RESOURCE AND OPERATIONAL MANAGEMENT PRACTICES ON COMPANY PRODUCTIVITY: A LONGITUDINAL STUDY

2008 ◽  
Vol 61 (3) ◽  
pp. 467-501 ◽  
Author(s):  
KAMAL BIRDI ◽  
CHRIS CLEGG ◽  
MALCOLM PATTERSON ◽  
ANDREW ROBINSON ◽  
CHRIS B. STRIDE ◽  
...  
Keyword(s):  
Longitudinal Study ◽  
Human Resource ◽  
Management Practices ◽  
Operational Management ◽  
The Impact

scholarly journals A Phased Assessment of Restoration Alternatives to Achieve Phosphorus Water Quality Targets for Lake Okeechobee, Florida, USA

Water ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 327 ◽  
Author(s):  
Yogesh Khare ◽  
Ghinwa Naja ◽  
G. Stainback ◽  
Christopher Martinez ◽  
Rajendra Paudel ◽  
...  
Keyword(s):  
Best Management Practices ◽  
Management Practices ◽  
Nutrient Management ◽  
Control Strategies ◽  
Cost Effective ◽  
South Florida ◽  
Assessment Model ◽  
Lake Okeechobee ◽  
Stormwater Treatment ◽  
Maximum Daily Loads

Achieving total phosphorus (TP) total maximum daily loads (TMDL) for Lake Okeechobee (Florida, FL, USA), a large freshwater lake, is a key component of the greater Everglades ecosystem restoration and sustainability of south Florida. This study was aimed at identification of a cost-effective restoration alternative using four TP control strategies—Best Management Practices (BMPs), Dispersed Water Management (DWM), Wetland Restoration, and Stormwater Treatment Areas (STAs)—to achieve a flow-weighted mean TP concentration of 40 µg/L at lake inflow points, through a phased scenario analysis approach. The Watershed Assessment Model was used to simulate flow and phosphorus dynamics. The 10-year (1998–2007) ‘Base’ scenario calibration indicated ‘acceptable’ to ‘good’ performance with simulated annual average flows and TP load of 2.64 × 109 m3 and 428.6 metric tons, respectively. Scenario results showed that TP load reduction without STAs would be around 11–40% with respect to Base compared to over 75% reduction requirement to achieve TMDL, indicating STAs as a necessary component to achieve restoration. The most cost-effective alternative to achieve TP target consisted of implementation of nutrient management BMPs, continuation of existing DWM projects, and the construction of ~200 km2 of STAs for a total project cost of US $4.26 billion.

scholarly journals Pollutant Loading Analysis of Suspended Solid, Nitrogen and Phosphorus at Bertam Catchment, Cameron Highlands using MUSIC

2018 ◽  
Vol 7 (4.35) ◽  
pp. 743
Author(s):  
N.S.M. Noh ◽  
L.M. Sidek ◽  
S.H. Haron ◽  
A. H. M. Puad ◽  
Z. Selamat
Keyword(s):  
Best Management Practices ◽  
Management Practices ◽  
Calculated Data ◽  
Suspended Solid ◽  
Stormwater Treatment ◽  
Urban Stormwater ◽  
Nitrogen And Phosphorus ◽  
Reservoir Water ◽  
Pollutant Loading ◽  
Cameron Highlands

This paper aimed to analyze the pollutant loading composition of suspended solids, nitrogen and phosphorus in urban stormwater at Cameron Highlands which known as popular tourism, agriculture and function as reservoir water to generate electricity. Researchers found the urban stormwater quantity modeling has achieved sufficient accuracy benchmark. However, modeling stormwater runoff quality is relatively difficult and largely depends on catchment characteristics/land-uses. Model of Urban Stormwater Improvement Conceptualization (MUSIC) estimates pollutant transport from catchments and stormwater treatment through different application of Best Management Practices (BMPs). Result obtained from the observed and calculated data was compared with MUSIC's estimations under a similar scenario where no applications of BMPs. As a second scenario, series of treatment train is propose for each sub-catchments based on the suitability and verification on site that consists of constructed stormwater treatment BMPs (wetlands, bio-retention, on-site detention, sediment basin and gross pollutant traps). Implementation of BMPs reduce nearly 100% of gross pollutant, 65% - 83% TSS, 40% - 66% TP and 52% - 78% due to effectiveness of BMPs in treating the pollutant within different landuse. As a summary, MUSIC can conceptually determine the effectiveness of BMPs without giving a detailed design.

The Effect of Climate Change on Rainfall Trends and Flooding Risk in the West of Scotland

1997 ◽  
Vol 28 (1) ◽  
pp. 37-50 ◽  
Author(s):  
M.G. Mansell
Keyword(s):  
Climate Change ◽  
The West ◽  
General Increase ◽  
River Flows ◽  
Rainfall Events ◽  
Rainfall Trends ◽  
Flooding Risk

Evidence is presented of a general increase in river flows in four catchments in the West of Scotland in the last 30 years. The increase has been significantly higher than the increase in rainfall over the same period. It is postulated that the more than proportionate increase is due to changes in the distribution and pattern of rainfall events although changes in evapotranspiraiion rates are also considered.

Rill erosion on a structurally degraded sandy loam surface soil

Soil Research ◽  
1993 ◽  
Vol 31 (4) ◽  
pp. 419 ◽  
Author(s):  
BW Murphy ◽  
TC Flewin
Keyword(s):  
Soil Loss ◽  
Management Practices ◽  
Surface Soil ◽  
Sandy Loam ◽  
Soil Aggregates ◽  
Aggregate Stability ◽  
Rill Erosion ◽  
Rainfall Events ◽  
Infiltration Rates ◽  
Low Intensity

This study reports on the degree of rill erosion from a 0.65 ha site with a hardsetting red duplex soil having a structurally degraded surface soil. Rill erosion was measured after a series of relatively low intensity rainfall events (all <1 yr return period) that resulted in above average rainfall over a period of 78 days. The rill erosion was estimated by measuring the volume of rills in the field. The soil characteristics indicated that the soil was a structurally degraded soil with low aggregate stability (2-5% of total soil), very low organic matter levels (0.91% for 0-50 mm) and relatively high bulk density (1.56 g/cm3). The low aggregate stability resulted in the rapid breakdown of soil aggregates and settling of the soil under rainfall causing surface crusting and low infiltration rates (4.08 mm/h) as well as decreasing depressional storage. This resulted in high runoff and rill erosion, the total volume and mass of soil loss being equivalent to 48.3 m3/ha and 78.0 t/ha respectively. This high level of soil loss was considered to result from the combination of the poor structural condition of the soil, the tilled or loosened soil condition at the onset of the rainfall events, the duration and number of the low intensity rainfall events and the low evaporation rates between rainfall events. The results suggest that to reduce soil loss to acceptable levels under the conditions of the study, it is necessary to adopt management practices that increase surface cover, maintain infiltration rates, reduce tillage and increase soil aggregate stability in combination with erosion control earthworks. The study also looked at the prediction of soil loss using the USLE equation, and confirmed that the equation should not be used to predict erosion for individual events or erosion resulting from concentrated flow, rather it should be used to estimate expected long-term soil loss for a particular soil under a given set of management practices.

Soil erosion in Austria – National calculations using regional data delivering local results for the ÖPUL programme

2020 ◽  
Author(s):  
Elmar Schmaltz ◽  
Georg Dersch ◽  
Christine Weinberger ◽  
Carmen Krammer ◽  
Peter Strauss
Keyword(s):  
Soil Erosion ◽  
Soil Loss ◽  
Management Practices ◽  
Error Sources ◽  
Rainfall Events ◽  
Erosion Rates ◽  
Environmentally Responsible ◽  
Spatially Distributed ◽  
Local Results ◽  
Erosion Hotspots

&lt;p&gt;Empirical models, such as the Revised Universal Soil Loss Equation (RUSLE) are in use since the 1950s to estimate the mean annual soil loss for single agricultural fields or spatially-distributed for larger areas (municipalities, regions or states). A particular focus on the computation of the RUSLE lies in the calculation of the respective factors on which the equation is built on and represent the erosivity of rainfall events, the erodibility of soils, the topography and land management. However, the RUSLE is highly susceptible to large errors in the prediction of the erosion rates of single agricultural parcels, due to the high variability of these factors in large areas (e.g. on national scale).&lt;/p&gt;&lt;p&gt;In this study, we present a parcel-sharp erosion map for the entire territory of Austria. We discuss frequent error sources of the factor computations and their consequences for the representativeness of erosion maps at nation-scale. Based on our results we discuss furthermore regional erosion hotspots and evaluate nationally funded management practices for soil erosion reduction as they are defined in the Austrian programme for an environmentally responsible agriculture (&amp;#214;PUL).&lt;/p&gt;&lt;p&gt;Since our approach depicts a novelty for Austria, we further describe opportunities for analysis of our results and highlight potential sources of errors, as well as regional and legal discrepancies of the distribution of national funds for soil conservation.&lt;/p&gt;

Best management practices for stormwater-runoff with alternative methods in a large urban catchment in Berlin, Germany

1998 ◽  
Vol 38 (10) ◽  
pp. 91-97 ◽  
Author(s):  
H. Sieker ◽  
M. Klein
Keyword(s):  
Best Management Practices ◽  
Urban Areas ◽  
Management Practices ◽  
Stormwater Runoff ◽  
Settling Tank ◽  
Alternative Methods ◽  
Stormwater Treatment ◽  
Urban Catchment ◽  
Best Management ◽  
Impervious Area

Because of multiple constraints, e.g. existing drainage systems, little available space and higher costs, Best Management Practices (BMP) for stormwater-runoff in existing urban areas is more difficult to apply than for new urban developments. For a large urban catchment (about 22 km2) with a separate drainage system in Berlin, Germany a combination of decentral (non-structural) and semi-central stormwater-management measures proved to be the best solution. It offers a high effectiveness concerning stormwater treatment at relatively low costs. Modern planning tools such as Geographic Information Systems (GIS) were used to investigate the possibilities of implementing decentral measures in larger areas. Correlations between field surveys and data from the ‘Environmental Information System’ of Berlin shows that even in highly urbanised areas a disconnection of 30% of the impervious area can easily be achieved. The resulting reduction of the discharge makes it possible to convert existing retention tanks to soil filter tanks. The purification efficiency of this combined measures is higher than of a central stormwater settling tank which has been simulated with a pollution load model.

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