Assessment of Soil Erosion at the Deðirmen Creek Watershed Area, Afyonkarahisar, Turkey

Forest conversion to some land use happened in all watershed, includes Batang Pelepat watershed. The objectives of this research are to know effect of forest conversion to land of rubber (Hevea brasiliensis) and palm oil (Elaeis guinensis Jack) farming on run off and soil erosion and different of erosion rate on agro technology of rubber and palm oil farming in Batang Pelepat watershed. The research was carried out during 3 months, begin October to December 2006. Run off and soil erosion measured plot with gutter in the lower of plot. Experimental design for this research is randomized complete block design, with land use type as treatment and slope class as replication or block. Data analyzed statistically by variance analysis (F-test) and Duncan New Multiple Range Test on confidence 95% (α = 0.05). The results of this research show that area of forest coverage in Batang Pelepat watershed was decreasing. In 1986 this area still 94,50% of watershed area, but in 1994 area of forest only 78,17% and in 2006 forest area 64,20% of watershed area. Forest conversion was carried out to land of rubber and palm oil farming with some actual agro technologies. Land of monoculture rubber I resulted the highest run off and soil erosion more than the other land use type and showed different of run off and soil erosion on land of secondary forest.

Download Full-text

Hydrogeology and Ground-Water Flow in the Opequon Creek Watershed area, Virginia and West Virginia

Scientific Investigations Report ◽

10.3133/sir20095153 ◽

2009 ◽

Author(s):

Mark D. Kozar ◽

David J. Weary

Keyword(s):

West Virginia ◽

Ground Water ◽

Water Flow ◽

Ground Water Flow ◽

Watershed Area ◽

Creek Watershed

Download Full-text

Prediksi Erosi Dan Arahan Penggunaan Lahan Di Bagian Hulu Das Wai Illa Desa Amahusu Kecamatan Nusaniwe Kota Ambon

Agrologia ◽

10.30598/a.v5i1.194 ◽

2018 ◽

Vol 5 (1) ◽

Author(s):

Rudy Soplanit ◽

Junet Putinella ◽

Elga Siwalette Siwalette

Keyword(s):

Land Use ◽

Soil Erosion ◽

Soil Conservation ◽

Equation Method ◽

Survey Method ◽

Environmental Damage ◽

Field Observations ◽

Watershed Area ◽

Low Level ◽

Damage Prevention

The use of land without a good management lead to land destruction and environmental damage. Prevention should be done by soil conservation. The objective of this research was to estimate the level of soil erosion in the upstream of watershed area of Wai Illa by using a survey method for field observations and USLE (Universal Soil Loos Equation) method to predict the amount of eroded soil. The results showed that the existing land use in areas of research was mixed farms, and scrub with a low level of soil damage on land L433 unit1 and high slopes on the land slopes L533 unit 4. It was predicted that actual annual erosion ranged from 16.524 t/ha up to 315.659 t/ha.

Download Full-text

Effect of ENSO-based upstream water withdrawals for irrigation on downstream water withdrawals

Hydrology Research ◽

10.2166/nh.2020.156 ◽

2020 ◽

Vol 51 (4) ◽

pp. 602-620

Author(s):

Laljeet Sangha ◽

Jasmeet Lamba ◽

Hemendra Kumar

Keyword(s):

Assessment Tool ◽

Southern Oscillation ◽

Swat Model ◽

Water Withdrawal ◽

Stream Flows ◽

Watershed Area ◽

Creek Watershed ◽

Water Withdrawals ◽

Southeast Us ◽

Ecologically Sustainable

Abstract In the Southeast US, El Niño Southern Oscillation (ENSO), climate variability phenomena affect the quantity of water that is available for irrigation. The goals of this study were to determine the effect of upstream surface water withdrawals for irrigation on the quantity of water available for irrigation in downstream areas as a function of the ENSO phase and quantify the watershed area that can be irrigated using water withdrawn from streams in an ecologically sustainable manner. The study was conducted in the Swan Creek watershed (97 km2) located in Limestone County, Alabama, USA. The soil and water assessment tool (SWAT) model was used to simulate stream flows and develop water withdrawal prescriptions. Results indicated that when simultaneous water withdrawals were made at the outlet of each subwatershed throughout the year, on average water withdrawals were sufficient to irrigate 4–16% of the area upstream of withdrawal point depending on stream order. On making sustainable withdrawals at the outlets of all subwatersheds and at the watershed outlet throughout the year, approximately 40% of the watershed area could be irrigated.

Download Full-text

Determination of Imperviousness in the Highland Creek Watershed

SURG Journal ◽

10.21083/surg.v3i1.1027 ◽

2009 ◽

Vol 3 (1) ◽

pp. 26-30

Author(s):

Angelin Satgunarajah

Keyword(s):

Land Use ◽

Geographical Information Systems ◽

Geographical Information ◽

Aerial Photographs ◽

Watershed Area ◽

A Value ◽

Impervious Area ◽

Creek Watershed ◽

Severe Impairment ◽

The Difference

The Highland Creek watershed, an area of about 100 square kilometres in the region of Toronto, was selected for this study. As a highly urbanized area, construction of roads and buildings has increased the region’s imperviousness to watershed, which can cause severe impairment to both the quality and quantity of water. The imperviousness of this region therefore needed to be assessed to manage the watershed area effectively, and to improve future development projects. The task of assessing the watershed area was accomplished using digitized aerial photographs and Geographical Information Systems (GIS). Because GIS does not give detail total road area of land use, the difference between total area and impervious area was calculated and assigned as a total road area. The ratio between the impervious area and the total area was calculated to assess the impervious ratio of the watershed area, and was assigned a value of 0.533. Using this method, more than 120 subcategories can be selected within this watershed area, and the imperviousness can be calculated using land use subcategory ratios and averages ratios.

Download Full-text

Predicting Soil Erosion in the Santa Rosa Creek Watershed Using RUSLE2 and Geographic Information Systems

10.15368/theses.2011.64 ◽

2011 ◽

Author(s):

Stacey Carol Smith

Keyword(s):

Information Systems ◽

Geographic Information Systems ◽

Soil Erosion ◽

Geographic Information ◽

Creek Watershed

Download Full-text

Estimating Landscape Vulnerability to Soil Erosion by RUSLE Model Using GIS and Remote Sensing: A Case of Zariema watershed, Northern Ethiopia

10.21203/rs.3.rs-136586/v1 ◽

2020 ◽

Author(s):

Yonas Hagos

Keyword(s):

Soil Erosion ◽

Soil Loss ◽

Loss Rate ◽

Steep Slope ◽

Annual Rainfall ◽

Northern Ethiopia ◽

Rusle Model ◽

Watershed Area ◽

Factor C ◽

Soil Loss Rate

Abstract Background:Zariema watershed located in the Tekeze basin Northern highlands of Ethiopia has been a subject to serious problem of soil erosion. Soil degradation due to soil erosion is one of the key environmental and socioeconomic case which threats soil nutrient depletion and food security in northern Ethiopian highlands. This study was conducted to estimate the soil loss rate and identify hotspot areas using RUSLE model in the Zariema watershed, Tekeze basin, Ethiopia.Methods:The rainfall – runoff erosivity(R) factor was determined from mean annual rainfall, soil erodibility(K) factor from soil map, Topographic factor (Ls) were generated from DEM, Crop management factor (C) and Conservation support practice factor(P) obtained from land use/land cover map. Finally, the factors were integrated with Arc GIS 10.3 tools to estimate soil loss rates and landscape vulnerability to soil erosion of the study watershed. Results:Annual Soil losses rates were estimated to be between 0 ton ha-1 year-1 in plain areas and 989 ton ha-1 year-1 in steep slope areas of the study watershed. The total annual soil loss from the entire watershed area of 2239.33Sq. Km was about 3,603,895.23 tons. About 31.41% of the study areas were affected through the soil loss hazard which is above acceptable soil loss rate 11 ton ha-1 year-1. The spatial hazard classification rate was 68.59% of the watershed area categorized as slight (0 – 11 ton ha-1 year-1), 8.03% moderate (12 – 18 ton ha-1 year-1), 7.64% high (19 – 30 ton ha-1 year-1), 6.65% very high (31 – 50 ton ha-1 year-1) and 9.09% severe (>51 ton ha-1 year-1). Conclusion:As a result, In the cultivation land around steep slope the soil loss rate was in sever condition. To mitigate the severity of the soil erosion in the identified prone area which accounts for about 31.41% of the total watershed area immediate action of soil and water conservation required.

Download Full-text