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Water Resource Management

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Articles 1 - 30 of 232

Full-Text Articles in Engineering

Sectional Model Of A Prairie Buffer Strip In A Laboratory Flume For Water Quality Research, Andrew J. Craig, Michelle L. Soupir, Chris R. Rehmann Feb 2021

Sectional Model Of A Prairie Buffer Strip In A Laboratory Flume For Water Quality Research, Andrew J. Craig, Michelle L. Soupir, Chris R. Rehmann

Agricultural and Biosystems Engineering Publications

Vegetative buffers have shown promising results in reducing runoff volume, sediment, nutrients, and manure‐borne contaminants in runoff from agricultural fields. Although these vegetative buffer systems have been extensively tested in field and plot‐scale studies that utilize either natural or simulated rainfall, studies of such systems under highly controlled conditions in the laboratory have been limited. Here, we present the development of a new system for laboratory testing of a full‐scale, sectional, physical model of a new practice under the Continuous Conservation Reserve Program (CRP) Clean Lakes, Estuaries, and Rivers (CLEAR) Initiative, CP‐43 Prairie Strips. This work ...


Lake Atitlan: A Review Of The Food, Energy, And Water Sustainability Of A Mountain Lake In Guatemala, Timothy P. Neher, Michelle L. Soupir, Rameshwar S. Kanwar Jan 2021

Lake Atitlan: A Review Of The Food, Energy, And Water Sustainability Of A Mountain Lake In Guatemala, Timothy P. Neher, Michelle L. Soupir, Rameshwar S. Kanwar

Agricultural and Biosystems Engineering Publications

This paper summarizes the findings of an extensive review of literature that was conducted to understand the historical state of the food, energy, and water nexus in the Lake Atitlan basin and to recommend incentive-based, long-term sustainable policies to become a significant driver to Guatemala’s tourism industry and GDP growth. The SWAT (Soil and Water Assessment Tool) was implemented in the basin to work towards the goal of simulating nutrient loading. A key conclusion of this review study is for the local population to have advocacy for the “zero wastewater discharge to Lake Atitlan” initiative to bring long-term benefits ...


Water–Energy–Food Nexus Framework For Promoting Regional Integration In Central Asia, Olimjon Saidmamatov, Inna Rudenko, Stephan Pfister, Jacek A. Koziel Jul 2020

Water–Energy–Food Nexus Framework For Promoting Regional Integration In Central Asia, Olimjon Saidmamatov, Inna Rudenko, Stephan Pfister, Jacek A. Koziel

Agricultural and Biosystems Engineering Publications

This paper focuses on regional integration through the lenses of the Water–Food–Energy (WEF) nexus, a concept putting strong emphasis on cross-sectoral and multi-level interactions as well as on resource interdependencies. There is an extensive amount of published research focusing on the Aral Sea basin. In this paper, the authors build upon these different contributions and provide a meta-analysis of the literature of WEF nexus opportunities in Central Asia (CA) countries. This paper contributes to ongoing discussions regarding how the WEF Nexus can represent an opportunity for reinforced collaboration regarding resources management. To do so, focusing on existing literature ...


Seasonal Variations In Export Of Antibiotic Resistance Genes And Bacteria In Runoff From An Agricultural Watershed In Iowa, Timothy P. Neher, Lanying Ma, Thomas B. Moorman, Adina Howe, Michelle L. Soupir Jun 2020

Seasonal Variations In Export Of Antibiotic Resistance Genes And Bacteria In Runoff From An Agricultural Watershed In Iowa, Timothy P. Neher, Lanying Ma, Thomas B. Moorman, Adina Howe, Michelle L. Soupir

Agricultural and Biosystems Engineering Publications

Seasonal variations of antimicrobial resistance (AMR) indicators in runoff water can help improve our understanding of AMR sources and transport within an agricultural watershed. This study aimed to monitor multiple areas throughout the Black Hawk Lake (BHL) watershed (5324 ha) in central Iowa during 2017 and 2018 that consists of both swine and cattle feeding operations as well as known areas with manure application. The measured indicators included plate counts for fecal indicator bacteria (FIB) E. coli, Enterococcus, antibiotic resistant fecal indicator bacteria (ARBs) tylosin resistant Enterococcus, tetracycline resistant Enterococcus, and antibiotic resistance genes (ARGs): ermB, ermF (macrolide), tetA, tetM ...


An Environmental And Economic Analysis Of Flocculation Technology Applied To A Corn-Based Ethanol Plant, Maria Da Conceição T. B. E Oliveira, Kurt A. Rosentrater Feb 2020

An Environmental And Economic Analysis Of Flocculation Technology Applied To A Corn-Based Ethanol Plant, Maria Da Conceição T. B. E Oliveira, Kurt A. Rosentrater

Agricultural and Biosystems Engineering Publications

The stimulation of renewable fuel production is related to the environmental issues resulting from the extraction and utilization of fossil fuels. Although corn-based ethanol is one of the leading renewable fuels and promises to mitigate these environmental impacts, it generates large volumes of wastewater with high concentrations of organic material (CODcr > 30,000 mg/L) and low pH (3.5–4.5), which leads to serious environmental concerns. A common method of treatment of distillery wastewater is the Dry Distilled Grain Soluble (DDGS) process, which separates liquid and solid fractions; however, a disadvantage of this process is its high ...


Nrt-Infews: The Datafewsion Traineeship Program For Innovations At The Nexus Of Food Production, Renewable Energy, And Water Quality, Sarah M. Ryan, Michelle L. Soupir, Amy Kaleita, Sergio Horacio Lence, Robert C. Brown Jan 2020

Nrt-Infews: The Datafewsion Traineeship Program For Innovations At The Nexus Of Food Production, Renewable Energy, And Water Quality, Sarah M. Ryan, Michelle L. Soupir, Amy Kaleita, Sergio Horacio Lence, Robert C. Brown

Industrial and Manufacturing Systems Engineering Conference Proceedings and Posters

Sustainable provision of food, energy and clean water requires understanding of the interdependencies among systems, as well as the motivations and incentives of farmers and rural policy makers. Agriculture lies at the heart of interactions among food, energy and water systems (FEWS). It is an increasingly energy intensive enterprise, but is also a growing source of energy. Agriculture places large demands on water supplies while poor practices can degrade water quality. Each of these interactions creates opportunities for modeling driven by sensor-based and qualitative data collection to improve the effectiveness of system operation and control in the short term, as ...


Denitrifying Bioreactor Woodchip Recharge: Media Properties After Nine Years, Laura E. Christianson, Gary W. Feyereisen, Christopher Hay, Ulrike W. Tschirner, Keegan Kult, Niranga M. Wickramarathne, Natasha L. Hoover, Michelle L. Soupir Jan 2020

Denitrifying Bioreactor Woodchip Recharge: Media Properties After Nine Years, Laura E. Christianson, Gary W. Feyereisen, Christopher Hay, Ulrike W. Tschirner, Keegan Kult, Niranga M. Wickramarathne, Natasha L. Hoover, Michelle L. Soupir

Agricultural and Biosystems Engineering Publications

There is a lack of information on denitrifying bioreactors treating subsurface drainage water at the end of their initial design life due to the relative newness of the technology and the relatively long estimated life. A denitrifying bioreactor (15 m L x 7.6 m W x 1.1 m D) installed in August 2008 in Greene County, Iowa, was recharged with new woodchips in November 2017 (age 9.25 years), providing the opportunity to evaluate the properties of the wood media at the end of design life. The objective was to pair a battery of physical, chemical, and nitrate-N ...


Midwestern Cropping System Effects On Drainage Water Quality And Crop Yields, Brian W. Dougherty, Carl H. Pederson, Antonio P. Mallarino, Daniel S. Andersen, Michelle L. Soupir, Ramesh S. Kanwar, Matthew J. Helmers Dec 2019

Midwestern Cropping System Effects On Drainage Water Quality And Crop Yields, Brian W. Dougherty, Carl H. Pederson, Antonio P. Mallarino, Daniel S. Andersen, Michelle L. Soupir, Ramesh S. Kanwar, Matthew J. Helmers

Agricultural and Biosystems Engineering Publications

Grain producers are challenged to maximize crop production while utilizing nutrients efficiently and minimizing negative impacts on water quality. There is a particular concern about nutrient export to the Gulf of Mexico via loss from subsurface drainage systems. The objective of this study was to investigate the effects of crop rotation, tillage, crop residue removal, swine manure applications, and cereal rye (Secale cereale) cover crops on nitrate‐N (NO3‐N) and Total Reactive P (TRP) loss via subsurface drainage. The study was evaluated from 2008 through 2015 using thirty‐six 0.4‐ha plots outfitted with a subsurface drainage water ...


The Development Of The Infews-Er: A Virtual Resource Center For Transdisciplinary Graduate Student Training At The Nexus Of Food, Energy, And Water, Luis F. Rodríguez, Anna-Maria Marshall, Dan Cotton, Richard Koelsch, Jacek A. Koziel, Deanne Meyer, Dan Steward, Jill Heemstra, Anand Padmanabahn, John Classen, Nathan J. Meyer, Benjamin L. Ruddell, Sean M. Ryan, Ximing Cai, Emad Habib, Peter D. Saundry Apr 2019

The Development Of The Infews-Er: A Virtual Resource Center For Transdisciplinary Graduate Student Training At The Nexus Of Food, Energy, And Water, Luis F. Rodríguez, Anna-Maria Marshall, Dan Cotton, Richard Koelsch, Jacek A. Koziel, Deanne Meyer, Dan Steward, Jill Heemstra, Anand Padmanabahn, John Classen, Nathan J. Meyer, Benjamin L. Ruddell, Sean M. Ryan, Ximing Cai, Emad Habib, Peter D. Saundry

Agricultural and Biosystems Engineering Publications

Problems at the nexus of Food, Energy and Water Systems (FEWS) are among the most complex challenges we face. Spanning simple to complex temporal, geographic, social, and political framings, the questions raised at this nexus require multidisciplinary if not transdisciplinary approaches. Answers to these questions must draw from engineering, the physical and biological sciences, and the social sciences. Practical solutions depend upon a wide community of stakeholders, including industry, policymakers, and the general public. Yet there are many obstacles to working in a transdisciplinary environment: unfamiliar concepts, specialized terminology, and countless “blind” spots. Graduate education occurs in disciplinary ‘silos', often ...


Large-Scale Performance Testing Of Temporary Sediment Basin Treatments And High-Rate Lamella Settlers, Michael A. Perez, Wesley C. Zech, Jose C. Vasconcelos, Xing Fang Jan 2019

Large-Scale Performance Testing Of Temporary Sediment Basin Treatments And High-Rate Lamella Settlers, Michael A. Perez, Wesley C. Zech, Jose C. Vasconcelos, Xing Fang

Civil, Construction and Environmental Engineering Publications

Sediment basins are temporary practices commonly used to detain stormwater runoff and capture suspended sediment on construction sites. A 79.0 m3 (2790 ft3) sediment basin testing apparatus at the Auburn University—Erosion and Sediment Control Testing Facility was used to provide a series of controlled and repeatable, large-scale tests to understand the performance of sediment basins and provide improvements. This research evaluated five sediment basin configurations over the course of 27 individual tests, including: (1) a standard configuration, (2) the addition of an excavated sump upstream of a ditch check, (3) the modification of the first baffle, (4) a ...


Remote Sensing Of Large Reservoir In The Drought Years: Implications On Surface Water Change And Turbidity Variability Of Sobradinho Reservoir (Northeast Brazil), Vitor S. Martins, Amy Kaleita, Claudio C.F. Barbosa, Alice C. Fassoni-Andrade, Felipe De Lucia Lobo, Evlyn M.L.M. Novo Jan 2019

Remote Sensing Of Large Reservoir In The Drought Years: Implications On Surface Water Change And Turbidity Variability Of Sobradinho Reservoir (Northeast Brazil), Vitor S. Martins, Amy Kaleita, Claudio C.F. Barbosa, Alice C. Fassoni-Andrade, Felipe De Lucia Lobo, Evlyn M.L.M. Novo

Agricultural and Biosystems Engineering Publications

Sobradinho reservoir has been suffering a severe water loss caused by multi-year drought in the Northeast Brazil. This reservoir contributes to the socio-economic development of the semi-arid region, and the monitoring of water shortage is crucial for people living in this climate-vulnerable region. In this study, we evaluate the surface water change and turbidity variability of Sobradinho reservoir during recent drought years (2013–2017). A time-series dataset was created using 109 Landsat-8 OLI images for mapping the water extent in the reservoir. A non-linear regression between measured turbidity and surface reflectance (red band) was developed and applied for turbidity retrievals ...


Exploring Multiple Operating Scenarios To Identify Low-Cost, High Nitrate Removal Strategies For Electrically-Stimulated Woodchip Bioreactors, Ji-Yeow Law, Michelle L. Soupir, D. Raj Raman, Thomas Moorman Sep 2018

Exploring Multiple Operating Scenarios To Identify Low-Cost, High Nitrate Removal Strategies For Electrically-Stimulated Woodchip Bioreactors, Ji-Yeow Law, Michelle L. Soupir, D. Raj Raman, Thomas Moorman

Agricultural and Biosystems Engineering Publications

Woodchip bioreactors are recognized as an effective best management practice in the Iowa Nutrient Reduction Strategy. This edge-of-field practice intercepts and removes NO3-N, thereby reducing the NO3-N concentration in tile drainage before being discharged into surface water. Actual NO3-N load reductions realized by woodchip bioreactors are impacted by bioreactor size, hydraulic retention time (HRT), and denitrification efficiency. A typical woodchip bioreactor in Iowa may have 0.07% bioreactor area with respect to treatment area, 4–8 h HRT, and 43% mean denitrification efficiency. Here, we explored the potential of using electrically stimulated woodchip bioreactors to achieve greater NO3-N removal, and ...


Assessing Pathogen Presence In An Intensively Tile Drained, Agricultural Watershed, Elizabeth L. Rieke, Thomas Moorman, Michelle L. Soupir, F. Yang, Adina Howe Aug 2018

Assessing Pathogen Presence In An Intensively Tile Drained, Agricultural Watershed, Elizabeth L. Rieke, Thomas Moorman, Michelle L. Soupir, F. Yang, Adina Howe

Agricultural and Biosystems Engineering Publications

Increases in swine production and concomitant manure application provide beneficial nutrients for crops but also include the potential to spread pathogenic bacteria in the environment. While manure is known to contain a variety of pathogens, little is known regarding the long-term effect of manure application on fate and transport of this diverse set of pathogens into surrounding waterways. We report on the use of 16S-rRNA gene sequencing to detect pathogen-containing genera in the agriculturally dominated South Fork Iowa River watershed, home to approximately 840,000 swine in the 76,000-ha basin. DNA was extracted from monthly grab samples collected from ...


Water And Sediment Microbial Quality Of Mountain And Agricultural Streams, Pramod Pandey, Michelle L. Soupir, Yi Wang, Wenlong Cao, Sagor Biswas, Venkata Vaddella, Robert Atwill, Venkatesh Merwade, Gregory Pasternack Jul 2018

Water And Sediment Microbial Quality Of Mountain And Agricultural Streams, Pramod Pandey, Michelle L. Soupir, Yi Wang, Wenlong Cao, Sagor Biswas, Venkata Vaddella, Robert Atwill, Venkatesh Merwade, Gregory Pasternack

Agricultural and Biosystems Engineering Publications

Increased public health risk caused by pathogen contamination in streams is a serious issue, and mitigating the risk requires improvement in existing microbial monitoring of streams. To improve understanding of microbial contamination in streams, we monitored Escherichia coli in stream water columns and streambed sediment. Two distinct streams and their subwatersheds were studied: (i) a mountain stream (Merced River, California), which represents pristine and wild conditions, and (ii) an agricultural stream (Squaw Creek, Iowa), which represents an agricultural setting (i.e., crop, manure application, cattle access). Stream water column and sediment samples were collected in multiple locations in the Merced ...


Impact Of Temperature And Hydraulic Retention Time On Pathogen And Nutrient Removal In Woodchip Bioreactors, Michelle L. Soupir, Natasha L. Hoover, Thomas B. Moorman, Ji Yeow Law, Bradley L. Bearson Mar 2018

Impact Of Temperature And Hydraulic Retention Time On Pathogen And Nutrient Removal In Woodchip Bioreactors, Michelle L. Soupir, Natasha L. Hoover, Thomas B. Moorman, Ji Yeow Law, Bradley L. Bearson

Agricultural and Biosystems Engineering Publications

Woodchip denitrification bioreactors are an important edge-of-field practice for treating agricultural drainage; however, their ability to filter microbial pollutants has primarily been explored in the context of wastewater treatment. Upflow column reactors were constructed and tested for E. coli, Salmonella, NO3-N, and dissolved reactive phosphorus (DRP) at hydraulic retention times (HRTs) of 12 and 24 h and at controlled temperatures of 10 and 21.5 °C. Influent solution was spiked to 30 mg L−1 NO3-N, 2–8 × 105 E. coli and Salmonella, and 0.1 mg L−1 DRP. Microbial removal was consistently observed with removal ranging from 75 ...


Portable Canopy Chamber Measurements Of Evapotranspiration In Corn, Soybean, And Reconstructed Prairie, Chenyi Luo, Zhuangji Wang, Thomas J. Sauer, Matthew J. Helmers, Robert Horton Feb 2018

Portable Canopy Chamber Measurements Of Evapotranspiration In Corn, Soybean, And Reconstructed Prairie, Chenyi Luo, Zhuangji Wang, Thomas J. Sauer, Matthew J. Helmers, Robert Horton

Agricultural and Biosystems Engineering Publications

Evapotranspiration (ET) is a vital component of a field water balance. Canopy chambers are a promising method for determining crop ET because they are portable and applicable at a relatively small plot (m2) scale. Although a variety of canopy chamber designs have been proposed, field tests are still necessary to evaluate chamber performance for measuring crop ET. The objectives of this study are (1) to construct and use an improved canopy chamber to measure ET of three crops [corn (Zea mays, L.), soybean (Glycine max), and reconstructed mixed prairie] and (2) to compare the canopy chamber measurements with flux tower ...


Beyond The Nutrient Strategies: Common Ground To Accelerate Agricultural Water Quality Improvement In The Upper Midwest, Center For Watershed Protection, Inc., Laura Christianson, Matthew J. Helmers, Gregory Mcisaac, David Mulla, Walton Family Foundation Jan 2018

Beyond The Nutrient Strategies: Common Ground To Accelerate Agricultural Water Quality Improvement In The Upper Midwest, Center For Watershed Protection, Inc., Laura Christianson, Matthew J. Helmers, Gregory Mcisaac, David Mulla, Walton Family Foundation

Agricultural and Biosystems Engineering Publications

Nutrients in drainage waters from the Upper Mississippi River Basin states have been a well-documented contributor to the Gulf of Mexico hypoxic zone for decades, and in response, twelve states have developed strategies to address this issue, with Iowa, Minnesota, and Illinois performing rigorous science assessments which estimated nitrogen and phosphorus reduction effectiveness for numerous agricultural non-point source conservation practices. The practices identified in these strategies were compared to identify areas of consensus and discord on nutrient load reduction potentials. Additionally, each practice was assessed for (1) the suitability to stack or be layered with other practices (stackability), (2) the ...


Improving The Nutrient Removal Capabilities Of Woodchip Bioreactors, Emily Ann Martin Jan 2018

Improving The Nutrient Removal Capabilities Of Woodchip Bioreactors, Emily Ann Martin

Graduate Theses and Dissertations

Intensive farming, fertilizer application, and the mineralization of soil organic matter in the Upper Midwestern United States, coupled with an extensive subsurface tile drainage, has contributed to excessive nutrient loading to surface waters. Woodchip bioreactors are a cost effective and minimally invasive edge-of-field practice designed to remove nitrate (NO3-N) from subsurface drainage. The NO3-N removal efficiency of woodchip bioreactors can be impacted by several factors, including hydraulic residence time (HRT) and the type of carbon source used.

The first study (Chapter 3) examined the impact of three HRTs, 2 hours, 8 hours, and 16 hours, on denitrification in a set ...


Improving The Nutrient Removal Capabilities Of Woodchip Bioreactors, Emily Ann Martin Jan 2018

Improving The Nutrient Removal Capabilities Of Woodchip Bioreactors, Emily Ann Martin

Graduate Theses and Dissertations

Intensive farming, fertilizer application, and the mineralization of soil organic matter in the Upper Midwestern United States, coupled with an extensive subsurface tile drainage, has contributed to excessive nutrient loading to surface waters. Woodchip bioreactors are a cost effective and minimally invasive edge-of-field practice designed to remove nitrate (NO3-N) from subsurface drainage. The NO3-N removal efficiency of woodchip bioreactors can be impacted by several factors, including hydraulic residence time (HRT) and the type of carbon source used.

The first study (Chapter 3) examined the impact of three HRTs, 2 hours, 8 hours, and 16 hours, on denitrification in a set ...


Hydrological And Empirical Modeling Framework For Farmed Prairie Potholes In The Prairie Pothole Region Of Iowa, Pawan Upadhyay Jan 2018

Hydrological And Empirical Modeling Framework For Farmed Prairie Potholes In The Prairie Pothole Region Of Iowa, Pawan Upadhyay

Graduate Theses and Dissertations

Closed surface depressions, also known as “potholes” play an important role in the hydrologic cycle and provide multiple environmental services including flood mitigation, water quality improvements, and wildlife habitat. In the Prairie Pothole Region, which covers approximately 715,000 km2, including parts of three Canadian provinces (Saskatchewan, Manitoba, and Alberta) and five states in the U.S. (Minnesota, Iowa, North and South Dakota, and Montana), these potholes are typically farmed and are a dominant feature in the landscape. These potholes are also different than the traditional prairie pothole wetlands as the natural vegetation (Typha spp., Scirpus spp., Carex spp., etc ...


Electrical Stimulation For Enhanced Denitrification In Woodchip Bioreactors: Opportunities And Challenges, J. Y. Law, Michelle L. Soupir, D. Raj Raman, T. B. Moorman, Say K. Ong Jan 2018

Electrical Stimulation For Enhanced Denitrification In Woodchip Bioreactors: Opportunities And Challenges, J. Y. Law, Michelle L. Soupir, D. Raj Raman, T. B. Moorman, Say K. Ong

Agricultural and Biosystems Engineering Publications

Woodchip bioreactors are being implemented for the removal of nitrates in groundwater and tile water drainage. However, low nitrate removals in denitrifying woodchip bioreactors have been observed for short hydraulic retention time (HRT) and low water temperature (°C). One potential approach to improve woodchip bioreactor performance is to provide an alternative and readily available electron source to the denitrifying microorganisms through electrical stimulation. Previous work has demonstrated the capability of bio-electrochemical reactors (BER) to remove a variety of water contaminants, including nitrate, in the presence of a soluble carbon source. The objective of this study was to evaluate the denitrification ...


Effects Of Subsurface Drainage Systems On Water And Nitrogen Footprints Simulated With Rzwqm2, Kristina Craft, Matthew J. Helmers, Robert W. Malone, Carl H. Pederson, Linda R. Schott Jan 2018

Effects Of Subsurface Drainage Systems On Water And Nitrogen Footprints Simulated With Rzwqm2, Kristina Craft, Matthew J. Helmers, Robert W. Malone, Carl H. Pederson, Linda R. Schott

Agricultural and Biosystems Engineering Publications

Developing drainage water management (DWM) systems in the Midwest to reduce nitrogen (N) transport to the northern Gulf of Mexico hypoxic zone requires understanding of the long-term performance of these systems. Few studies have evaluated long-term impacts of DWM, and the simulation of controlled drainage (CD) with the Root Zone Water Quality Model (RZWQM) is limited, while shallow drainage (SD) has not been examined. We tested RZWQM using nine years (2007-2015) of field data from southeast Iowa for CD, SD, conventional drainage (DD), and undrained (ND) systems and simulated the long-term (1971-2015) impacts. RZWQM accurately simulated N loss in subsurface ...


Assessing Surface Flowpath Interception By Vegetative Buffers Using Arcgis Hydrologic Modeling And Geospatial Analysis For Rock Creek Watershed, Central Iowa, David F. Webber, Manveen Bansal, Steven K. Mickelson, Matthew J. Helmers, Kapil Arora, Brian K. Gelder, Manish Shrivastav, Casey J. Judge Jan 2018

Assessing Surface Flowpath Interception By Vegetative Buffers Using Arcgis Hydrologic Modeling And Geospatial Analysis For Rock Creek Watershed, Central Iowa, David F. Webber, Manveen Bansal, Steven K. Mickelson, Matthew J. Helmers, Kapil Arora, Brian K. Gelder, Manish Shrivastav, Casey J. Judge

Agricultural and Biosystems Engineering Publications

Nonpoint-source (NPS) pollution is a major cause of surface water quality degradation due to the transport of chemicals, nutrients, and sediments into lakes and streams. Vegetative buffers comprise several effective landscape best management practices (BMPs) that include vegetative filter strips (VFS) and grassed waterways. However, some BMPs are less effective due to concentrated surface flow, improper cropland-to-VFS area ratios, and surface flowpaths that partially or completely bypass vegetative buffers. The overall objective of this study was to quantify the accuracy of simulated flowpaths relative to observed and global positioning system (GPS)-assisted ground-truthed surface flowpaths for improved placement of VFS ...


Meeting The Nitrate Reduction Goal: What Will It Take?, Jamie Benning, Matt Helmers, Mark Licht Dec 2017

Meeting The Nitrate Reduction Goal: What Will It Take?, Jamie Benning, Matt Helmers, Mark Licht

Proceedings of the Integrated Crop Management Conference

The Iowa Nutrient Reduction Strategy is a science and technology-based framework developed to assess and reduce nutrient loss to Iowa waters and the Gulf of Mexico. The strategy addresses methods and practices to reduce total loads of nitrogen and phosphorus from both municipal and industrial point sources and agricultural nonpoint sources by a combined 45% (INRSSA, 2013). The approach was developed in response to the 2008 Gulf Hypoxia Action Plan that calls for Iowa and other states in the Mississippi River watershed to develop strategies to reduce nutrient loadings to the Gulf of Mexico and ultimately reduce the size of ...


Simulation Of Daily Flow Pathways, Tile-Drain Nitrate Concentrations, And Soil-Nitrogen Dynamics Using Swat, Fyra Engineering, Michelle L. Soupir, Matthew J. Helmers, William G. Crumpton, Jeffrey G. Arnold, Philip W. Gassman Dec 2017

Simulation Of Daily Flow Pathways, Tile-Drain Nitrate Concentrations, And Soil-Nitrogen Dynamics Using Swat, Fyra Engineering, Michelle L. Soupir, Matthew J. Helmers, William G. Crumpton, Jeffrey G. Arnold, Philip W. Gassman

Agricultural and Biosystems Engineering Publications

Tile drainage significantly alters flow and nutrient pathways and reliable simulation at this scale is needed for effective planning of nutrient reduction strategies. The Soil and Water Assessment Tool (SWAT) has been widely utilized for prediction of flow and nutrient loads, but few applications have evaluated the model's ability to simulate pathway-specific flow components or nitrate-nitrogen (NO3-N) concentrations in tile-drained watersheds at the daily time step. The objectives of this study were to develop and calibrate SWAT models for small, tile-drained watersheds, evaluate model performance for simulation of flow components and NO3-N concentration at daily intervals, and evaluate simulated ...


Assessment Of Bioenergy Cropping Scenarios For The Boone River Watershed In North Central Iowa, United States, Philip W. Gassman, Adriana M. Valcu-Lisman, Catherine L. Kling, Steven K. Mickelson, Yiannis Panagopoulos, Raj Cibin, Indrajeet Chaubey, Calvin F. Wolter, Keith E. Schilling Dec 2017

Assessment Of Bioenergy Cropping Scenarios For The Boone River Watershed In North Central Iowa, United States, Philip W. Gassman, Adriana M. Valcu-Lisman, Catherine L. Kling, Steven K. Mickelson, Yiannis Panagopoulos, Raj Cibin, Indrajeet Chaubey, Calvin F. Wolter, Keith E. Schilling

Agricultural and Biosystems Engineering Publications

Several biofuel cropping scenarios were evaluated with an improved version of Soil and Water Assessment Tool (SWAT) as part of the CenUSA Bioenergy consortium for the Boone River Watershed (BRW), which drains about 2,370 km2 in north central Iowa. The adoption of corn stover removal, switchgrass, and/or Miscanthus biofuel cropping systems was simulated to assess the impact of cellulosic biofuel production on pollutant losses. The stover removal results indicate removal of 20 or 50% of corn stover in the BRW would have negligible effects on streamflow and relatively minor or negligible effects on sediment and nutrient losses, even ...


The Effect Of Five Biomass Cropping Systems On Soil-Saturated Hydraulic Conductivity Across A Topographic Gradient, Lisa A. Schulte-Moore, Matthew J. Helmers, Randall K. Kolka Sep 2017

The Effect Of Five Biomass Cropping Systems On Soil-Saturated Hydraulic Conductivity Across A Topographic Gradient, Lisa A. Schulte-Moore, Matthew J. Helmers, Randall K. Kolka

Agricultural and Biosystems Engineering Publications

Understanding the environmental impact of bioenergy crops is needed to inform bioenergy policy development. We determined the effects of five biomass cropping systems—continuous maize (Zea mays), soybean (Glycine max)-triticale (Triticosecale ×)/soybean-maize, maize-switchgrass (Panicum virgatum), triticale/sorghum (Sorghum bicolor), and triticale-aspen (Populus alba × P. grandidentata)—on soil-saturated hydraulic conductivity (K S ) across a toposequence in central Iowa, USA. We compared data from the time of cropping system establishment in 2009 to 4 years post-establishment. Both our 2009 and 2013 data confirmed that cropping system impacts on K S vary by landscape position. We found that differences in cropping system ...


New Algae Treatment Technology Addresses Stricter Wastewater Regulations For Rural Iowa, Max Gangestad Apr 2017

New Algae Treatment Technology Addresses Stricter Wastewater Regulations For Rural Iowa, Max Gangestad

Symposium on Undergraduate Research and Creative Expression

The US EPA and the Iowa DNR are enforcing new stricter wastewater treatment limits for communities throughout Iowa. The communities that these new permits affect the most are small rural communities because of the high costs associated with meeting the new limits. Our research, which is funded by ISU CIRAS and a private company Gross-Wen Technologies, is investigating a new algae based wastewater treatment technology. This technology is known as the revolving algal biofilm (RAB) treatment system and was invented by ISU researchers in 2012. Our current tests using a pilot scale RAB treatment system in Dallas Center, IA is ...


High Voltage Atmospheric Cold Plasma Treatment Of Wastewater, Jens Dancer Apr 2017

High Voltage Atmospheric Cold Plasma Treatment Of Wastewater, Jens Dancer

Symposium on Undergraduate Research and Creative Expression

Wastewater treatment facilities throughout Iowa and the United State use various methods to treat their water before releasing it into the environment. Some of these methods include chlorine and ultra violet light systems to bring the level of harmful bacteria in the water to an acceptable concentration before release. These current methods are costly and either consume large amounts of energy or consume chemicals to disinfect water. Recently developments in plasma technologies have shown that plasma generated gas can be used to kill bacteria and pathogens.

A majority of the previous research on plasma thus far has been on the ...


An Agent-Based Platform For The Study Of Watersheds As Coupled Natural And Human Systems, Leigh Tesfatsion, Chris R. Rehmann, Diego S. Cardoso, Yu Jie, William J. Gutowski Jr. Mar 2017

An Agent-Based Platform For The Study Of Watersheds As Coupled Natural And Human Systems, Leigh Tesfatsion, Chris R. Rehmann, Diego S. Cardoso, Yu Jie, William J. Gutowski Jr.

Civil, Construction and Environmental Engineering Publications

This study describes the architecture and capabilities of an open source agent-based Java platform that permits the systematic study of interactions among hydrology, climate, and strategic human decision-making in a watershed over time. To demonstrate the platform's use and capabilities, an application is presented in accordance with ODD protocol requirements that captures, in simplified form, the structural attributes of the Squaw Creek watershed in central Iowa. Illustrative findings are reported for the sensitivity of farmer and city social welfare outcomes to changes in three key treatment factors: farmer land-allocation decision method, farmer targeted savings, and levee quality effectiveness for ...