Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 22 for “"First Flush"”.
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First Flush Characterization of Storm Water Runoff
… research focused on the characterization of first flush in storm water runoff from elevated roadways, to assist the establishment of a storm water program and to facilitate the selection of treatment technology. Storm water runoff from highways transports a significant load of contaminants, …
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Sizing the first flush and its effect on the storage-reliability-yield behavior of rainwater harvesting in Rwanda
… from a roof after a rainstorm is known as the first flush and research has shown that diverting it from the main supply can improve the quality of stored water. This thesis considers a variety of design options for rainwater harvesting, set in the context of rural Bisate Village in northwestern …
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Impact of Piping Materials on Water Quality in Tegucigalpa, Honduras
… total Fe concentrations were greater for first flush conditions from the iron pipe. Water samples obtained from the PVC pipe showed higher total Mn concentrations and more black color than those obtained from the iron pipe for both first flush and continuous flow conditions. Residual …
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Tree Canopy Effects on Roof-Harvested Rainwater in East Texas
… comparison to drinking water standards, first-flush efficiency, and seasonal effects were evaluated.</p> <p> Significant differences among water quality parameters were observed among cover types for all analyzed parameters except nitrate-N and nitrite-N, which were often below the method …
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Modeling the hydrologic and particulate loadings from paved urban surfaces
… measurements of particulate-bound metal mass. A first flush analysis indicated that only events with average volumetric flow rates approaching 1 L/min/m of drainage width exhibit a rapid depletion of particulate matter consistent with the concentration-based definition of the first flush. An …
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Use of Automated Sampler to Characterize Urban Stormwater Runoff in Pecan Creek
… U.S. EPA's MCL's. Statistical analysis revealed first flush samples to be significantly more concentrated than composite samples. Minimum discharge loadings were found to be significantly lower than maximum discharge loadings. Additionally there were significant differences of specific …
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Simulation and design of diversion and detention system for urban stormwater management
Diversion of the first flush of storm runoff to a detention basin for pollutant removal is an efficient way to control nonpoint source pollutant in urban areas. This can be achieved by a diversion box and detention basin system. To numerically simulate the response of the system to a design …
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Evaluation of Nutrients and Suspended Solids Removal by Stormwater Control Measures Using High Flow Media
… Solids (TSS), Nitrogen, and Phosphorus in First Flush (FF) stormwater runoff. Excellent removal of TSS and particulate-bound nutrients was noted, but, in most SCMs, removal of dissolved species was limited. Sorption of dissolved P occurred, although most likely on captured and suspended …
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Split-flow Stormwater Management Strategy Design Feasibility and Cost Comparison
… currently achieved with either detention with first flush or comparable bioretention and infiltration systems, could be achieved in a more cost-effective manner using distributed split-flow stormwater management strategy.
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Rooftop Collected Rainwater Quality and Vegetation Impact: Field Work in Lagos, Nigeria, and the Related Experimental and Numerical Studies
… impact of some improvement techniques (such as first flush, sedimentation, and Household Treatment Techniques (HHTTs)) on the quality of rainwater was investigated. The QMRA results showed that those who harvest and drink rainwater without applying any HHTTs are at a very high risk of bacterial …
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Variations in needle morphology and anatomy as related to variations in photosynthetic potential within loblolly pine (Pinus taeda L.) canopies
… canopies of the three trees. Only foliage of the first flush of the current year’s growth was studied. Photosynthetic rates of each shoot were obtained at six light intensities (50-10,000 ft. candles) and expressed per unit of foliage surface area, per unit of foliage weight and per million …
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Factors Affecting Mobility of Copper in Soil-Water Matrices
… extent of dryness was found to affect mobility. First-flush-pattern for both copper and TOC from the columns was observed in all columns studies. In this research the copper mobility through the A- and B-horizon of Bojac sandy loam from the Eastern Shore of Virginia was studied. This study …
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Water quality and hydrological assessment and modeling of bioretention basins in tropical cities
… and manage bioretention basins in the tropics. First, field observations on water quality performance in six sampled events show that removal targets for total nitrogen, total phosphorus, and total suspended solids are generally met only for low-depth rainfall events and not high-depth events. …
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Lateral outflow from supercritical channels
… quality is diverting frequent storms or the first flush of less frequent storms to a structural debris filter and/or a constructed wetland prior to reentrance into the channel. The focus of this study was to develop a procedure to allow determination of laterally diverted flows of stormwater …
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Phosphorus Losses from Simulated Dairy Mangement Intensive Grazing Forage System
… from the runoff release plots to determine first flush phosphorus losses from the various treatments. Mass losses of total phosphorus (TP) for manure treatments in series 1 were significant due to plot installation disturbance. No significant effect for ortho-phosphorus (ortho-P), …
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Concentration of Suspended Solids and Nutrients in Overland Flow in Suburban Philadelphia Watersheds
… sediment and nutrient concentrations in first flush overland flow (OLF) in three of the DRWI focus areas. Seven sites were selected for collection of OLF, stream, and rain samples. A total of 228 samples from 24 sample locations across 17 storms were collected from the Pennypack Creek, …
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Performance of three oyster mushroom species grown on maize stalk supplemented with wheat bran and maize flour
… to start pinning (TP) was shorter within the first flush for all the mushroom species compared to the second and third flushes. Although, higher levels of supplementation negatively affected the MGR and days to full colonisation, there were however, some advantages of high supplementation. The …
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Development of dual water supply using rainwater harvesting and groundwater systems
… namely roof catchment, gutters, down pipe, first flush diverter, and storage tank were successfully designed. Meanwhile, groundwater was pumped from an existing tubewell. Both harvested rainwater and groundwater were then stored in a distribution tank. The first part of the analysis was …
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The Environmental Fate and transport of Trenbolone Acetate Metabolites in Agro-Ecosystems
… were predicted to be <1 ng/L, but actual first flush concentrations were 11 ng/L. Runoff concentrations dropped from 11 ng/L to 2 ng/L after only 3 m of overland flow and exceeded 1 ng/L levels for <30 minutes. During rainfall events from small (6-10 m2) plots, average 17a-TBOH …
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Novel studies of the dynamics of mineral N species transformations and their mobilities relevant to assessing risks to drainage water.
… The experimental work showed that much of the first flush of nitrate after a period of drying is therefore attributable to stored nitrate, as long as the drying out period is not excessively long. The mobility of ammonium-N in soils from Hob Moor was studied to test the hypothesis that in the …
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