Examining the first flush effect based on the relationship between concentrations and discharge rates in a rain garden inflow

2020 ◽  
Vol 180 ◽  
pp. 174-184
Author(s):  
Shuangcheng Tang ◽  
Zhonghua Jia ◽  
Qing Xu ◽  
Wan Luo ◽  
Zhengqing Shan
Keyword(s):  
Rain Garden ◽  
First Flush ◽  
Discharge Rates ◽  
First Flush Effect ◽  
The Relationship

Determination of first flush criteria using dynamic EMCs (event mean concentrations) on highway stormwater runoff

2007 ◽  
Vol 55 (3) ◽  
pp. 71-77 ◽  
Author(s):  
L.-H. Kim ◽  
S.-M. Jeong ◽  
S.-O. Ko
Keyword(s):  
Management Practice ◽  
Source Control ◽  
First Flush ◽  
Event Mean Concentration ◽  
Best Management ◽  
Storm Duration ◽  
Accumulated Rainfall ◽  
First Flush Effect ◽  
The Relationship

Recently the Ministry of Environment in Korea has developed the total maximum daily load program in accordance with the target pollutant and its concentration goal on four major large rivers. Since the program is largely related to regional development, nonpoint source control is both important and topical. Of the various nonpoint sources, highways are stormwater intensive land uses since they are impervious and have high pollutant mass emissions from vehicular activity. The event mean concentration (EMC) is useful in estimating the loadings to receiving water bodies. However, the EMC does not provide information on the time varying changes in pollutant concentration or mass emissions, which are often important for best management practice development, or understanding shock loads. Therefore, in this study a new concept, the dynamic EMC determination method, will be introduced to clearly verify the relationship between EMC and the first flush effect. Three monitoring sites in Daejeon metropolitan city areas were equipped with an automatic rainfall gauge and a flow meter for accumulating the data such as rainfall and runoff flow. The dynamic EMC method was applied to more than 17 events, and the improved first flush criteria were determined on the ranges of storm duration and accumulated rainfall.

scholarly journals Evaluation of the Upper Paraná River discharge controlled by reservoirs

2009 ◽  
Vol 69 (2 suppl) ◽  
pp. 707-716 ◽  
Author(s):  
EE. Souza Filho
Keyword(s):  
Paraná River ◽  
River Level ◽  
Parana River ◽  
River Damming ◽  
Discharge Rates ◽  
Historical Series ◽  
Discharge Regime ◽  
Upper Paraná River ◽  
The Relationship ◽  
Different Levels

The building of large dams in the Upper Paraná River basin altered the discharge regime at the Porto São José River section. The discharge regime has been altered since 1972, but the changes intensified after the Porto Primavera damming, in late 1998. Considering that discharge control affects the relationship between channel and floodplain, this work aimed to evaluate the intensity of the discharge control that resulted from the operation of the Porto Primavera Dam. To achieve this objective, statistical analyses were carried out based on the Porto São José Fluviometric Station historical series of river level readings and discharge, between 1964 and 2007. Results showed that the average discharge increased from 1964 to 1981 and diminished after river damming. The increase of average discharge rates was followed by an increase of the duration of higher discharges at different levels of geomorphologic and limnological importance, and the reduction of average discharge during the last observed period was followed by a disproportionate decrease in the duration of the abovementioned discharges. Moreover, it is clear that the relationship between fluviometric level and fluvial discharge changed, which implies that a certain river level reading represents a higher discharge than necessary before river damming.

A new modeling approach for estimating first flush metal mass loading

2005 ◽  
Vol 51 (3-4) ◽  
pp. 159-167 ◽  
Author(s):  
L.-H. Kim ◽  
M. Kayhanian ◽  
S.-L. Lau ◽  
M.K. Stenstrom
Keyword(s):  
First Flush ◽  
Runoff Coefficient ◽  
Mass Loading ◽  
Storm Events ◽  
Metal Contaminants ◽  
Rain Intensity ◽  
Dry Period ◽  
Variable Parameters ◽  
Total Runoff ◽  
First Flush Effect

The purpose of this study was to investigate pollutant mass loading from major highways in Southern California, with emphasis on interpretation of event mean concentrations and first flush effects. The results of monitoring eight sites during the 1999–2002 storm seasons found that metal contaminants had higher concentrations at the early stages of storm events compared with other stages of rain storms. A new washoff model was developed to predict the event mean concentrations of metal contaminants taking first flush effect into account. Model variable parameters included average daily traffic, antecedent dry period, rain intensity, total runoff volume, and runoff coefficient. The results obtained using the washoff model were compared with measured values and found to fit well for heavy metals with R2 ranging from 0.8 to 0.95.

Socio-Medical Determinants of Hospital Utilization in Quebec, Canada, 1970–1975

1986 ◽  
Vol 16 (1) ◽  
pp. 43-55 ◽  
Author(s):  
Thomas T. H. Wan ◽  
Joel Broida
Keyword(s):  
Average Length ◽  
Subcutaneous Tissue ◽  
Circulatory System ◽  
Physician Services ◽  
Hospitalization Rates ◽  
Discharge Rates ◽  
Hospital Stays ◽  
English Speaking ◽  
Market Areas ◽  
The Relationship

The relationship between ambulatory physician use and hospitalization was studied using aggregate data in the Province of Quebec, Canada. The analysis showed that the introduction of health insurance covering physician services had a negligible influence on hospitalization. The average length of short-term hospital stays was determined by the proportion of aged population, the proportion of English speaking persons, and the prior level of hospitalization in the medical market areas. Overall, hospital discharge rates remained very constant during the period of six years (1970–1975). There were, however, reductions in hospitalization for infectious diseases, diseases of the blood and blood-forming organs, respiratory diseases, and diseases of the skin and subcutaneous tissue, and increases in the hospitalization rates for neoplasms, circulatory system disorders, musculoskeletal conditions, congenital anomalies, and perinatal morbidity and mortality.

Runoff pollution characterization and first flush effect of urban roof catchment

2018 ◽  
Vol 119 ◽  
pp. 262-266 ◽  
Author(s):  
Wei Zhang ◽  
Xiaoyue Zhang ◽  
Jingli Fan ◽  
Zhennan Shi ◽  
Yuhua Zhao ◽  
...  
Keyword(s):  
First Flush ◽  
First Flush Effect ◽  
Runoff Pollution

scholarly journals SELEKSI POHON TEDUHAN UNTUK RAIN GARDEN

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
Nova Annisa
Keyword(s):  
Water Content ◽  
Theobroma Cacao ◽  
Mangifera Indica ◽  
Psidium Guajava ◽  
Persea Americana ◽  
Canopy Closure ◽  
Rain Garden ◽  
Shade Trees ◽  
Gnetum Gnemon ◽  
The Relationship

Penelitian ini bertujuan untuk mengetahui jenis pohon yang sesuai untuk rain garden, jumlah stomata, proporsi penutupan kanopi dan kandungan air dalam daun dari beberapa jenis pohon teduhan, serta hubungan antara jumlah stomata daun dengan luas daun, jika terdapat faktor proporsi kandungan air yang diduga mempengaruhi akan dikendalikan. Data yang diperoleh di analisis  proporsi kandungan air dalam daun, proporsi penutupan kanopi, dan jumlah stomata dengan menggunakan analisis deskriptif. Untuk mengetahui hubungan antara luas daun, proporsi penutupan kanopi dan kandungan air dalam daun pada pohon teduhan digunakan analisis korelasi parsial dengan bantuan SPSS versi 17. Berdasarkan hasil penelitian terhadap kerapatan stomata dalam ukuran  1cm², diperolehlah 10 jenis pohon teduhan tertinggi seperti Psidium guajava (jambu biji), Mangifera casturi (kasturi), Hevea brasiliensis  (karet), Pithecellobium lobatum (jengkol), Mangifera indica (mangga), Theobroma cacao (coklat), Persea americana (alpukat), Eugenia aquea (jambu air), Gnetum gnemon (melinjo), dan Arthocarpus heterophyllus (nangka). Kerapatan stomata daun tidak berhubungan terhadap luas daun pada pohon teduhan. Kata kunci: pohon teduhan rain garden, stomata. This study aims to determine the type of tree suitable for rain garden, number of stomata, the proportion of canopy closure and water content in the leaves of several types of shade trees, and the relationship between the number of leaf stomata to leaf area, if there is a proportion factor thought to affect the water content will be controlled. Data obtained in the analysis of the proportion of water content in the leaves, the proportion of canopy closure, the location of the tree, and the number of stomata by using descriptive analysis. To determine the relationship between leaf area, the proportion of canopy closure and water content in the leaves of the shade trees used partial correlation analysis with SPSS version 17. Based on the results of a study of the density of stomata in the size of 1 cm², found 10 species of trees shade the best such as Psidium guajava (guava), Mangifera casturi (kasturi), Hevea brasiliensis (rubber), Pithecellobium lobatum (jengkol), Mangifera indica (mango), Theobroma cacao (brown), Persea americana (avocado), Eugenia aquea (rose apple), Gnetum gnemon (melinjo), and Arthocarpus heterophyllus (jackfruit). The density of leaf stomata are not related to the broad leaves of the shade tree. Keywords: rain garden, shade tree, stomata.

Eruption Pattern and a Long-Term Magma Discharge Rate over the Past 100 Years at Kelud Volcano, Indonesia

2019 ◽  
Vol 14 (1) ◽  
pp. 27-39 ◽  
Author(s):  
Fukashi Maeno ◽  
Setsuya Nakada ◽  
Mitsuhiro Yoshimoto ◽  
Taketo Shimano ◽  
Natsumi Hokanishi ◽  
...  
Keyword(s):  
Discharge Rate ◽  
Explosive Eruptions ◽  
Historical Documents ◽  
The Past ◽  
Discharge Rates ◽  
Cumulative Volume ◽  
Magma Discharge ◽  
Mass Discharge ◽  
The Relationship

Kelud Volcano is among the most active volcanoes in Indonesia, with repeated explosive eruptions throughout its history. Here, we reconstructed the relationship between the repose period and the cumulative volume of erupted material over the past 100 years and estimated the long-term magma discharge rate and future eruptive potential and hazards. Tephra data and eruption sequences described in historical documents were used to estimate the volume and mass discharge rate. The volumes of the 1901, 1919, 1951, 1966, 1990, and 2014 eruptions were estimated as 51–296 × 106m3. The mass discharge rates were estimated to be on the order of 107kg/s for the 1919, 1951, and 2014 eruptions and the order of 106kg/s for the 1966 and 1990 eruptions. Based on a linear relationship between the repose period and cumulative erupted mass, the long-term mass discharge rate was estimated as ∼ 1.5 × 1010kg/year, explaining the features of the larger eruptions (1919, 1951, and 2014) but not those of the smaller eruptions (1966 and 1990). This estimate is relatively high compared to other typical basaltic-andesitic subduction-zone volcanoes. This result provides important insights into the evolution of magmatic systems and prediction of future eruptions at Kelud Volcano.

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