scholarly journals Evaluation of Low Impact Development Using EPA SWMM-LID Modeling

10.29007/k8gk ◽  
2018 ◽  
Author(s):  
Jungho Kim ◽  
Jingul Joo
Keyword(s):  
Environmental Protection Agency ◽  
Low Impact Development ◽  
Reduction Rate ◽  
Technical Content ◽  
Rainfall Depth ◽  
Long Term Result ◽  
Quantitative Performance ◽  
Event Based ◽  
Stormwater Reduction

This study implemented the evaluation of Low Impact Development (LID) using SWMM-LID model developed by the U. S. Environmental Protection Agency (EPA), to assess the quantitative performance of LID facilities (seven type of LID facilities installed, vegetation place, plants garden pot, tree filter box, permeable pavement, infiltration ditch, rain barrel, infiltration rain-block). SWMM-LID modeling was useful to reflect the LID design into the model using the technical content representing LID facility in SWMM-LID. In the event-based result, the stormwater reduction was considerable since the reduction in average was 76.6% by the LID facilities. In the long- term result, the range of the reduction in average was 11.5~77.7% for seven types of LID facilities, and the average reduction for the total drainage area was 22.9%. The monthly reduction rate was affected by total rainfall depth and rainfall intensity.

scholarly journals Sensitivity of Model-Based Water Balance to Low Impact Development Parameters

Water ◽  
2018 ◽  
Vol 10 (12) ◽  
pp. 1838 ◽  
Author(s):  
Johannes Leimgruber ◽  
Gerald Krebs ◽  
David Camhy ◽  
Dirk Muschalla
Keyword(s):  
Water Balance ◽  
Environmental Protection Agency ◽  
Planning Process ◽  
Low Impact Development ◽  
Sensitivity Analyses ◽  
Storm Event ◽  
Water Balance Components ◽  
Soil Thickness ◽  
Model Based

Low impact development (LID) strategies aim to mitigate the adverse impacts of urbanization, like the increase of runoff and the decrease of evapotranspiration. Hydrological simulation is a reasonable option to evaluate the LID performance with respect to the complete water balance. The sensitivity of water balance components to LID parameters is important for the modeling and planning process of LIDs. This contribution presents the results of a global sensitivity analysis of model-based water balance components (runoff volume, evapotranspiration, groundwater recharge/storage change) using the US Environmental Protection Agency Storm Water Management Model to the parameters (e.g., soil thickness, porosity) of a green roof, an infiltration trench, and a bio-retention cell. All results are based on long-term simulations. The water balance and sensitivity analyses are evaluated for the long-term as well as single storm events. The identification of non-influential and most influential LID parameters for the water balance components is the main outcome of this work. Additionally, the influence of the storm event characteristics precipitation depth and antecedent dry period on the sensitivity of water balance components to LID parameters is shown.

Assessing the performances of low impact development alternatives by long-term simulation for a semi-arid area in Tianjin, northern China

2014 ◽  
Vol 70 (11) ◽  
pp. 1740-1745 ◽  
Author(s):  
Jinhui Jeanne Huang ◽  
Yu Li ◽  
Shuai Niu ◽  
Shu H. Zhou
Keyword(s):  
Water Balance ◽  
Environmental Protection Agency ◽  
Flood Control ◽  
Hydrological Cycle ◽  
Low Impact Development ◽  
Northern China ◽  
Evaluation Methods ◽  
Important Place ◽  
Semi Arid

For areas that are urbanized rapidly, the practice of low impact development (LID) has gained an important place in stormwater management and urban planning due to its capability and beneficial effects in restoring the original hydrological cycle. The performances of LID alternatives can vary substantially due to different climate conditions. This study investigated the performances of five LID alternatives under a semi-arid climate in northern China on water balance and flood control. A numerical model, Storm Water Management Model version 5 (US Environmental Protection Agency), was employed to run 10 years’ rainfall events for these objectives. Two evaluation methods were proposed in this study: the efficiency index for water balance and a performance radar chart. The investigation of the five LID alternatives revealed that these LID alternatives functioned differently in flood control and water balance, and porous pavement performed best in all indices except the lag time. The two evaluation methods, in conjunction with the long-term numerical simulation, can facilitate design and decision making by providing a clear picture of the performance and functions for these LID alternatives.

Clinical Study of Gud-Amalaka Yoga in Garbhini Mutrakrichra w.s.r to Urinary Tract Infections during Pregnancy

2017 ◽  
Vol 2 (2) ◽  
Author(s):  
Sandeep Kumar Rajan ◽  
Rajnish Gautam ◽  
Pankaj Mishra
Keyword(s):  
Pregnant Woman ◽  
Urinary Tract ◽  
The Body ◽  
Premature Delivery ◽  
Healthy Baby ◽  
Patient Reported ◽  
Long Term Result ◽  
Tract Infections ◽  
Prompt Attention

Healthy mother and healthy baby are foremost aim of antenatal care. Progressive anatomical and physiological changes during pregnancy are not only confined to the genital organs however within other systems of the body too, some may be felt as discomfort by a pregnant woman. A pregnant woman having pain or burning micturition, fever with chills, nausea, vomiting and cloudy urine having bad smell can be diagnosed as having Urinary Tract Infection (UTI). UTI is most common bacterial infection encountered during Pregnancy and troublesome to the woman suffering from it. Pyelonephritis, premature delivery and other risk such as PROM, IUGR etc. can be the long term result of UTI hence prompt attention is requisite. In the present study Gud-Amalaka Yoga has been tried in 15 patients for evaluation of its clinical efficacy and adverse / side effects if any. It was observed that Gud-Amalaka Yoga showed better results (25% patients were moderately improved, 75% patients were mildly improved). None of the patient reported any adverse effect during or after the treatment.

scholarly journals UV Stimulated Manganese Dioxide for the Persulfate Catalytic Degradation of Bisphenol A

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 502
Author(s):  
Guihua Dong ◽  
Bing Chen ◽  
Bo Liu ◽  
Stanislav R. Stoyanov ◽  
Yiqi Cao ◽  
...  
Keyword(s):  
Bisphenol A ◽  
Reaction Mechanisms ◽  
Reduction Rate ◽  
Catalytic Degradation ◽  
Gas Chromatography Mass Spectrometry ◽  
Degradation Pathways ◽  
Industrial Chemicals ◽  
Oh Groups ◽  
Long Term Adverse Effects

One of the most commonly produced industrial chemicals worldwide, bisphenol A (BPA), is used as a precursor in plastics, resins, paints, and many other materials. It has been proved that BPA can cause long-term adverse effects on ecosystems and human health due to its toxicity as an endocrine disruptor. In this study, we developed an integrated MnO2/UV/persulfate (PS) process for use in BPA photocatalytic degradation from water and examined the reaction mechanisms, degradation pathways, and toxicity reduction. Comparative tests using MnO2, PS, UV, UV/MnO2, MnO2/PS, and UV/PS processes were conducted under the same conditions to investigate the mechanism of BPA catalytic degradation by the proposed MnO2/UV/PS process. The best performance was observed in the MnO2/UV/PS process in which BPA was completely removed in 30 min with a reduction rate of over 90% for total organic carbon after 2 h. This process also showed a stable removal efficiency with a large variation of pH levels (3.6 to 10.0). Kinetic analysis suggested that 1O2 and SO4•− played more critical roles than •OH for BPA degradation. Infrared spectra showed that UV irradiation could stimulate the generation of –OH groups on the MnO2 photocatalyst surface, facilitating the PS catalytic degradation of BPA in this process. The degradation pathways were further proposed in five steps, and thirteen intermediates were identified by gas chromatography-mass spectrometry. The acute toxicity was analyzed during the treatment, showing a slight increase (by 3.3%) in the first 30 min and then a decrease by four-fold over 2 h. These findings help elucidate the mechanism and pathways of BPA degradation and provide an effective PS catalytic strategy.

scholarly journals Long term clinical result of implant induced injury on the adjacent tooth

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Yang-Jin Yi ◽  
In-Woo Park ◽  
Jeong-Kui Ku ◽  
Deuk-Won Jo ◽  
Jung-Suk Han ◽  
...  
Keyword(s):  
Retrospective Study ◽  
Root Surface ◽  
Chi Square ◽  
Group Iii ◽  
Direct Invasion ◽  
Adjacent Tooth ◽  
Group I ◽  
Long Term Result ◽  
Root Group

AbstractThe purpose of the retrospective study was to investigate the long-term result of implant-induced injury on the adjacent tooth. The subjects of this retrospective study were patients who had received implants and had tooth injury; direct invasion of root (group I), root surface contact (group II), or < 1 mm distance of the implant from the root (group III). Clinical and pathological changes were periodically examined using radiographs and intra-oral examinations. Paired t-tests and chi-square tests were used to evaluate the implant stability quotient (ISQ) of implant and tooth complications, respectively (α = 0.05). A total of 32 implants and teeth in 28 patients were observed for average 122.7 (± 31.7, minimum 86) months. Seven teeth, three of which were subsequently extracted, needed root canal treatment. Finally, 90.6% of the injured teeth remained functional. Complications were significant and varied according to the group, with group I showing higher events than the others. The ISQs increased significantly. One implant in group I resulted in osseointegration failure. The implant survival rate was 96.9%. In conclusion, it was found even when a tooth is injured by an implant, immediate extraction is unnecessary, and the osseointegration of the invading implant is also predictable.

Off-pump direct hepatic veins-to-hemiazygos vein anastomosis after primary Kawashima operation: long-term result

2021 ◽  
pp. 1-3
Author(s):  
Renate Kaulitz ◽  
Gerhard Ziemer ◽  
Michael Hofbeck
Keyword(s):  
Venous Blood ◽  
Venous Drainage ◽  
Hepatic Veins ◽  
Off Pump ◽  
Hemiazygos Vein ◽  
Close Proximity ◽  
Hepatic Venous Blood ◽  
Balanced Distribution ◽  
Long Term Result

Abstract Direct hepatic veins-to-hemiazygos connection offers the balanced distribution of hepatic venous blood to both lungs, not requiring anticoagulation. We report a 13-year follow-up after this type of off-pump Fontan completion. Patient’s hepatic veins-to-hemiazygos confluence increased with growth to allow for unobstructed flow. This unique technique can be recommended in heterotaxy patients, if atrial hepatic venous drainage and hemiazygos vein are in close proximity.

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