A Runoff Model for Small Watersheds in the Semi-Arid Tropics

Pathak, P; Laryea, K. B.; Sudi, R

doi:10.13031/2013.31200

Cited by 21 publications

(15 citation statements)

References 5 publications

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“…Due to these, the current agricultural productivity on these soils in most SAT regions remains low . Also with the current land use system, the rainfall use efficiency of the production systems are low, ranging from 35-55%, thus annually a large percentage of annual rainfall is lost as surface runoff, evaporation and deep drainage (Pathak et al, 2009;Pathak et al, 1989). Groundwater levels are depleting fast, and most rural rainfed areas are facing general water scarcity (Rockstrom et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Hydrological behavior of Alfisols and Vertisols in the semi-arid zone: Implications for soil and water management

Pathak

Sudi

Wani

et al. 2013

Agricultural Water Management

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Section: Introductionmentioning

confidence: 99%

Hydrological behavior of Alfisols and Vertisols in the semi-arid zone: Implications for soil and water management

Pathak

Sudi

Wani

et al. 2013

Agricultural Water Management

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“…For other two treatments viz. normal intercultivation plus one additional tillage with shoe cultivators and normal inter cultivation plus two additional tillage with shoe cultivators were simulated using runoff model [13] and crop yield model [14]. The runoff and soil loss data from the field scale experiment during 1991-95 were used to modify, calibrate and test the runoff and water balance model [13].…”

Section: Measurement and Data Analysismentioning

confidence: 99%

“…Various Parameters To simulate the inter-row tillage effects on runoff and soil loss on crusted Alfisols, one subroutine on surface roughness has been added to the runoff model by [13]. Immediately after the inter-row tillage the value of soil surface roughness is highest, which is gradually reduced by the subsequent rainfalls (raindrop impact) and runoff flow.…”

Section: Simulating Inter-row Tillage Effects Onmentioning

confidence: 99%

Inter-row tillage for improved soil and water conservation and crop yields on crusted Alfisols

Pathak¹,

Wani²,

Sudi³

et al. 2013

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In the semi-arid tropics (SAT), 33% areas are occupied by Alfisols and related soils. In SAT these soils have low structural stability and thereby tend to form seal and crusts at the surface. Due to this a large proportion of the rain that falls on Alfisols during the early part of the rainy season, is normally lost as runoff thus causing high soil loss as well as moisture stress to crops. Two tillage studies were conducted first at plot scale (320 m 2 ) during 1991-95 and second at small watershed scale (1.45 ha) during 2007-10, at ICRISAT research station, Hyderabad, India. These studies were conducted to find out whether the problem of excessive runoff and soil loss during the early part of the rainy season can be controlled by various inter-row tillage systems in addition to normal intercultivation by breaking the crust or seal and thereby improving infiltration and soil moisture and reducing runoff and soil loss. The observations on rainfall, runoff, soil moisture, soil loss, soil surface roughness and crop yields were collected from both the studies. Results from these studies have shown that inter-row tillage in addition to normal intercultivation is found effective in controlling early season runoff and soil loss and increasing crop yields. The additional tillage systems are found most effective during low and medium rainfall years and not so much during high rainfall years. The additional tillage with shoe cultivators, which creates rough soil surface (11 mm depression storage), is found most effective in increasing crop yields and reducing runoff and soil loss. The additional tillage with blade harrow which generates smooth soil surface is relatively less effective. In most rainfall conditions, the normal intercultivation with one additional tillage is found adequate for controlling early season runoff and improving soil moisture and crop yields.

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“…Dados de volume máximo de escoamento superficial são oportunos em estudos de manejo do solo e da água, para determinar a eficiência dos métodos de preparo e manejo do solo e no planejamento de irrigação suplementar (Pathak et al, 1989). Eles também são usados no projeto de diques, canais e outras estruturas para o controle da erosão.…”

Section: Escoamento Superficialunclassified

Chuvas intensas relacionadas à erosão hídrica

Santos

Griebeler

Oliveira³

2010

Rev. bras. eng. agríc. ambient.

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RESUMOAs características das precipitações que mais interferem no processo de erosão do solo são a intensidade, a duração e a frequência da precipitação e a sua erosividade. Sendo o solo um recurso de renovação lenta e podendo ser rapidamente degradado pela ação da erosão, torna-se fundamental o conhecimento da forma como a precipitação atua no ambiente no qual esteja inserido. Desta forma se facilitam o desenvolvimento de técnicas e tecnologias e o estabelecimento de ações para diagnosticar, avaliar e apresentar soluções aos problemas, tanto econômica como ambientalmente. Diversos trabalhos, incluindo resultados de pesquisas e desenvolvimento de modelos, têm correlacionado as características das precipitações no sentido de entender, prever e apresentar soluções ao problema erosivo. Neste sentido se buscou compilar alguns desses trabalhos, de modo a apresentar o "estado da arte" no que se refere a chuvas intensas, manejo do solo e erosão hídrica. Palavras-chave: escoamento superficial, intensidade-duração-frequência, modelos hidrológicos, perda de solo e águaIntense rainfalls related to water erosion ABSTRACTThe most important rainfall characteristics on erosion process are the relationship between intensity, duration and frequency of precipitation and its erosivity. As the soil is a slow renewal resource and can be quickly degraded by erosion, the knowledge about how the precipitation acts in the environment is fundamental. In this way, the development of techniques, technologies and the establishment of actions to diagnose, to evaluate and to present solutions to erosion problems is important both economically and environmentally. Many studies, including research results and development of models have correlated precipitations characteristics in order to understand, to predict and to present solutions for the erosion problem. In this sense, some of these studies were compiled with the purpose of presenting the "state of the art" with respect to precipitations, soil management and water erosion.

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A Runoff Model for Small Watersheds in the Semi-Arid Tropics

Cited by 21 publications

References 5 publications

Hydrological behavior of Alfisols and Vertisols in the semi-arid zone: Implications for soil and water management

Hydrological behavior of Alfisols and Vertisols in the semi-arid zone: Implications for soil and water management

Inter-row tillage for improved soil and water conservation and crop yields on crusted Alfisols

Chuvas intensas relacionadas à erosão hídrica

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