Development of Best Management Practices for Controlling the Non-Point Sources of Pollution Around Lake Victoria Using SWAT Model: A Case of Simiyu Catchment Tanzania

Water pollution by nitrogen originates at diffuse and point sources. In surface aquatic systems, nitrate is one of the most problematic forms of nitrogen, causing phytoplankton and macrophyte growth and consequently water eutrophication. This study evaluated whether the Soil and Water Assessment Tool (SWAT) model can simulate nitrate load in a rural watershed in daily and monthly time increments. The study investigated 462 km² of the upper part of the Stör catchment, a typical rural lowland catchment located in Northern Germany. The results showed that simulations of nitrate load at monthly increments are better predictors of observed data than daily simulations. The most effective practices to minimize the NO3-N load were the reduction of nitrogen fertilizer application and the increasing of conservation areas, such as field filter strips.

Download Full-text

Evaluating the Effectiveness of Best Management Practices On Soil Erosion Reduction Using the SWAT Model: for the Case of Gumara Watershed, Abbay (Upper Blue Nile) Basin

Environmental Management ◽

10.1007/s00267-021-01492-9 ◽

2021 ◽

Author(s):

Temesgen Gashaw ◽

Yihun T. Dile ◽

Abeyou W. Worqlul ◽

Amare Bantider ◽

Gete Zeleke ◽

...

Keyword(s):

Soil Erosion ◽

Best Management Practices ◽

Management Practices ◽

Swat Model ◽

Nile Basin ◽

Blue Nile ◽

Best Management ◽

Blue Nile Basin ◽

Gumara Watershed ◽

Upper Blue Nile Basin

Download Full-text

Effectiveness of Best Management Practices on Dependable Flows in a River Basin Using Hydrological SWAT Model

Water Management and Water Governance - Water Science and Technology Library ◽

10.1007/978-3-030-58051-3_22 ◽

2020 ◽

pp. 335-348

Author(s):

Santosh S. Palmate ◽

Ashish Pandey

Keyword(s):

River Basin ◽

Best Management Practices ◽

Management Practices ◽

Swat Model ◽

Best Management

Download Full-text

Evaluation of best management practices for sediment and nutrient loss control using SWAT model

Soil and Tillage Research ◽

10.1016/j.still.2019.04.016 ◽

2019 ◽

Vol 192 ◽

pp. 42-58 ◽

Cited By ~ 15

Author(s):

Sushil Kumar Himanshu ◽

Ashish Pandey ◽

Basant Yadav ◽

Ankit Gupta

Keyword(s):

Best Management Practices ◽

Management Practices ◽

Swat Model ◽

Nutrient Loss ◽

Best Management ◽

Loss Control

Download Full-text

Assessing the Impact of Best Management Practices in a Highly Anthropogenic and Ungauged Watershed Using the SWAT Model: A Case Study in the El Beal Watershed (Southeast Spain)

Agronomy ◽

10.3390/agronomy9100576 ◽

2019 ◽

Vol 9 (10) ◽

pp. 576 ◽

Cited By ~ 3

Author(s):

Adrián López-Ballesteros ◽

Javier Senent-Aparicio ◽

Raghavan Srinivasan ◽

Julio Pérez-Sánchez

Keyword(s):

Coastal Lagoon ◽

Best Management Practices ◽

Management Practices ◽

Assessment Tool ◽

Swat Model ◽

Fertilizer Application ◽

Coefficient Of Determination ◽

Check Dam ◽

Best Management ◽

The Impact

Best management practices (BMPs) provide a feasible solution for non-point source pollution problems. High sediment and nutrient yields without retention control result in environmental deterioration of surrounding areas. In the present study, the soil and water assessment tool (SWAT) model was developed for El Beal watershed, an anthropogenic and ungauged basin located in the southeast of Spain that drains into a coastal lagoon of high environmental value. The effectiveness of five BMPs (contour planting, filter strips, reforestation, fertilizer application and check dam restoration) was quantified, both individually and in combination, to test their impact on sediment and nutrient reduction. For calibration and validation processes, actual evapotranspiration (AET) data obtained from a remote sensing dataset called Global Land Evaporation Amsterdam Model (GLEAM) were used. The SWAT model achieved good performance in the calibration period, with statistical values of 0.78 for Kling–Gupta efficiency (KGE), 0.81 for coefficient of determination (R2), 0.58 for Nash–Sutcliffe efficiency (NSE) and 3.9% for percent bias (PBIAS), as well as in the validation period (KGE = 0.67, R2 = 0.83, NS = 0.53 and PBIAS = −25.3%). The results show that check dam restoration is the most effective BMP with a reduction of 90% in sediment yield (S), 15% in total nitrogen (TN) and 22% in total phosphorus (TP) at the watershed scale, followed by reforestation (S = 27%, TN = 16% and TP = 20%). All effectiveness values improved when BMPs were assessed in combination. The outcome of this study could provide guidance for decision makers in developing possible solutions for environmental problems in a coastal lagoon.

Download Full-text

Phosphorus dynamics in vegetated buffer strips in cold climates: a review

Environmental Reviews ◽

10.1139/er-2017-0077 ◽

2018 ◽

Vol 26 (3) ◽

pp. 255-272 ◽

Cited By ~ 21

Author(s):

Kristen A. Kieta ◽

Philip N. Owens ◽

David A. Lobb ◽

Jason A. Vanrobaeys ◽

Don N. Flaten

Keyword(s):

Best Management Practices ◽

Management Practices ◽

Careful Consideration ◽

Point Sources ◽

Cold Climate ◽

Future Research ◽

Winter Period ◽

Buffer Strips ◽

Cold Climates ◽

Best Management

The movement of excess phosphorus (P) into streams, rivers, and lakes poses a significant threat to water quality and the health of aquatic ecosystems and thus, P has been targeted for reduction. In landscapes dominated by agriculture, P is primarily transported through non-point sources, which a number of best management practices aim to target. One such practice is vegetated buffer strips (VBS), which are designed to use dense vegetation above the surface and extensive root systems below the surface to reduce runoff velocity, trap sediments, increase infiltration, and increase plant uptake of nutrients. The effectiveness of VBS in reducing P concentrations has been studied and reviewed, but most studies have been undertaken in warm or temperate climates, where runoff is primarily driven through summer rainfall events and when vegetation is actively growing. In cold climates, the majority of runoff occurs during the snowmelt period, when soils are frozen and vegetation has been flattened by snow and ice over the winter period and is not actively taking up nutrients. These conditions hinder the ability of VBS to work as designed. Additionally, frozen vegetation can release P after undergoing freeze–thaw cycles (FTCs). Thus, this review aimed to (i) summarize research designed to determine the effectiveness of VBS in reducing P transport in cold climates, (ii) collate research on the potential for vegetation to release P after undergoing FTCs, and (iii) identify research gaps to be addressed in determining VBS effectiveness in cold climates. Cold-climate VBS implemented in Canada, the northern United States, and northern Europe have shown P removal efficiencies ranging from −36% to +89%, a range that identifies the uncertainty surrounding the use of VBS in these landscapes. However, there is consensus among researchers globally that vegetation does release P after undergoing FTCs, though P concentrations from different species vary across studies. The design and management of VBS in cold climates requires careful consideration, and VBS may not always be the best management strategy to reduce P transport. Future research should be undertaken at a larger scale in natural systems and focus on VBS design and management strategies.

Download Full-text

Framework to prioritize watersheds for diffuse pollution management in the Republic of Korea: application of multi-criteria analysis using the Delphi method

Natural Hazards and Earth System Science ◽

10.5194/nhess-19-2767-2019 ◽

2019 ◽

Vol 19 (12) ◽

pp. 2767-2779 ◽

Cited By ~ 2

Author(s):

Gyumin Lee ◽

Kyung Soo Jun ◽

Minji Kang

Keyword(s):

Decision Making ◽

Point Source ◽

Best Management Practices ◽

Delphi Technique ◽

Management Practices ◽

Point Sources ◽

Republic Of Korea ◽

Point Source Pollution ◽

Best Management ◽

Non Point Source Pollution

Abstract. This study aimed to develop a risk-based approach for determining control areas to manage non-point source pollution, developing a framework to prioritize catchments by considering the characteristics of polluted runoff from non-point sources. The best management, decision-making, and scientific approaches, such as the technique for order of preference by similarity to ideal solution (TOPSIS) and the Delphi technique, are required for the designation of control areas and the application of the best management practices to the control areas. Multi-criteria decision-making (MCDM) methods can handle the diversity and complexity of non-point source pollution. The Delphi technique was employed for selecting the assessment criteria/sub-criteria and determining their weights. Sub-criteria for each catchment unit were scored with either a quantitative or qualitative scale. All non-point pollution sources in mainland Republic of Korea were included, with the exception of a few islands, with catchment prioritization and pollution vulnerability evaluations shown as thematic maps. This study contributes to the field by developing a new risk-based approach for ranking and prioritizing catchments; this provides valuable information for the Ministry of Environment to use to identify control areas and manage non-point source pollution.

Download Full-text

Calibration of a Field-Scale Soil and Water Assessment Tool (SWAT) Model with Field Placement of Best Management Practices in Alger Creek, Michigan

Sustainability ◽

10.3390/su10030851 ◽

2018 ◽

Vol 10 (3) ◽

pp. 851 ◽

Cited By ~ 9

Author(s):

Katherine Merriman ◽

Amy Russell ◽

Cynthia Rachol ◽

Prasad Daggupati ◽

Raghavan Srinivasan ◽

...

Keyword(s):

Great Lakes ◽

Best Management Practices ◽

Management Practices ◽

Assessment Tool ◽

Swat Model ◽

Scale Model ◽

Field Scale ◽

Best Management ◽

Water Assessment ◽

Soil And Water

Subwatersheds within the Great Lakes “Priority Watersheds” were targeted by the Great Lakes Restoration Initiative (GLRI) to determine the effectiveness of the various best management practices (BMPs) from the U.S. Department of Agriculture-Natural Resources Conservation Service National Conservation Planning (NCP) Database. A Soil and Water Assessment Tool (SWAT) model is created for Alger Creek, a 50 km2 tributary watershed to the Saginaw River in Michigan. Monthly calibration yielded very good Nash–Sutcliffe efficiency (NSE) ratings for flow, sediment, total phosphorus (TP), dissolved reactive phosphorus (DRP), and total nitrogen (TN) (0.90, 0.79, 0.87, 0.88, and 0.77, respectively), and satisfactory NSE rating for nitrate (0.51). Two-year validation results in at least satisfactory NSE ratings for flow, sediment, TP, DRP, and TN (0.83, 0.54, 0.73, 0.53, and 0.60, respectively), and unsatisfactory NSE rating for nitrate (0.28). The model estimates the effect of BMPs at the field and watershed scales. At the field-scale, the most effective single practice at reducing sediment, TP, and DRP is no-tillage followed by cover crops (CC); CC are the most effective single practice at reducing nitrate. The most effective BMP combinations include filter strips, which can have a sizable effect on reducing sediment and phosphorus loads. At the watershed scale, model results indicate current NCP BMPs result in minimal sediment and nutrient reductions (<10%).

Download Full-text

Evaluation of AnnAGNPS in cold and temperate regions

Water Science & Technology ◽

10.2166/wst.2006.060 ◽

2006 ◽

Vol 53 (2) ◽

pp. 263-270 ◽

Cited By ~ 6

Author(s):

S. Das ◽

R.P. Rudra ◽

P.K. Goel ◽

B. Gharabaghi ◽

N. Gupta

Keyword(s):

Best Management Practices ◽

Sediment Yield ◽

Management Practices ◽

Water Quality Management ◽

Point Sources ◽

Runoff Generation ◽

Southern Ontario ◽

Best Management ◽

Sediment Component ◽

Selection Of

Identification of the pollution sources and understanding the processes related to runoff generation and pollution transportation is effective for the water quality management and selection of the Best Management Practices. The ANNualized AGricultural Non-Point Source (AnnAGNPS) model was applied to a watershed in Southern Ontario to evaluate the hydrology and sediment component from the non-point sources. The model was run for two years (1998 to 1999); one year's data was used to calibrate and the second year's data was used for validation purposes. The model has under predicted runoff amount and over predicted the sediment yield. However, the simulated runoff and sediment yield compared fairly well with the observed data indicating that the model had an acceptable performance in simulation of runoff and sediment. The study is still in progress to assess its performance for estimation of TMDL and improvements needed for the model to use under Ontario conditions.

Download Full-text