Seasonal Dynamics of Agricultural Soil Cover in Runoff Generation

Aguiar, Wagner de; Sampaio, Sílvio César; Paisani, Julio César; Remor, Marcelo Bevilacqua; Reis, Ralpho Rinaldo dos

doi:10.1590/1809-4430-eng.agric.v39n5p592-599/2019

“…Generally, very small events can be considered infiltrated and indicated for groundwater recharge (Pangle et al, 2022). In contrast, common events are the most used for designing water quality control structures (Conceição et al, 2018;Aguiar et al, 2019;Lu et al, 2022). Consistency can be observed between the analyses carried out by Rivard (2010) and those obtained in this study, which had a percentage of occurrence of 4.7% for rainfall in the range of 30 to 35 mm in the municipality of Piracicaba, for example.…”

Section: Resultssupporting

confidence: 59%

Light Rain for Runoff and Design Depth

Johansson,

Farias-Ramirez,

Jacomazzi

et al. 2024

JER

0

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The disorderly soil occupation without the necessary conservationist practices leads to impacts on the local hydrology and induces the pollution of water resources. This pollution may come from more urbanized areas due to the amount of pollutants drained during the rains. Even moderate precipitations constitute one of the main factors that define pollutant runoff on the surface. These rains have recently been called light rains. Light rains have a lower precipitation height and a higher frequency compared to classic rains of drainage projects, being necessary to define them according to patterns of rain frequency for each region. This study aimed to characterize light rain in the municipality of Piracicaba to establish statistical standards for the frequency of certain precipitation heights. A database provided by the ESALQ/USP automatic weather station, which provides precipitation measurements every 15 minutes, was used in the present study. Light rain heights reached 40.3, 41.4, and 42.7 mm for 100, 90, or 80% frequencies, respectively, which implies the use of return periods of 1.00, 1.11, and 1.25 years, respectively.

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“…Generally, very small events can be considered infiltrated and indicated for groundwater recharge (Pangle et al, 2022). In contrast, common events are the most used for designing water quality control structures (Conceição et al, 2018;Aguiar et al, 2019;Lu et al, 2022).…”

Section: Resultsmentioning

confidence: 99%

Light Rain Characterization in Piracicaba, São Paulo State, Brazil

Johanson¹,

Farias-Ramirez²,

Jacomazzi³

et al. 2023

Eng. Agríc.

0

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The disorderly soil occupation without the necessary conservationist practices leads to impacts on the local hydrology and induces the pollution of water resources. This pollution may come from more urbanized areas due to the amount of pollutants drained during the rains. Even moderate precipitations constitute one of the main factors that define pollutant runoff on the surface. These rains have recently been called light rains. Light rains have a lower precipitation height and a higher frequency compared to classic rains of drainage projects, being necessary to define them according to patterns of rain frequency for each region. This study aimed to characterize light rain in the municipality of Piracicaba to establish statistical standards for the frequency of certain precipitation heights. A database provided by the ESALQ/USP automatic weather station, which provides precipitation measurements every 15 minutes, was used in the present study. Light rain heights reached 40.3, 41.4, and 42.7 mm for 100, 90, or 80% frequencies, respectively, which implies the use of return periods of 1.00, 1.11, and 1.25 years, respectively.

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Sensitivity analysis of rainfall–runoff parameters models to estimate flows

Yogi

¹

,

Corrêa

²

,

Arruda

³

et al. 2021

Appl Water Sci

2

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Determinate the runoff of a watershed is a challenge due to the complexity of representing all “inlets” and “outlets” involved in a rainfall–runoff model. Therefore, methodologies applied for this purpose should have a good representation of the variables that most influence in this process. One of the models used to calculate the design flow is the (USDA in Urban Hydrology for Small. Technical release, no 55 (TR-55). Soil Conservation Service. Washigton, DC, http://scholar.google.com/scholar?hl=en&btnG=Search&q=intitle:Urban+Hydrology+for+Small+watersheds#1, 1986), which considers the analysis changes in soil coverage, time of concentration (tc), and recurrence period (T). In this way, this study sought to evaluate the hydrological behavior of a watershed with an increase in soil waterproofing. These modifications were correlated with the variation of runoff coefficients (CN), modifications of the periods of recurrence indicated by the literature, and different equations of the time of concentration. Its application was carried out in the Ribeirão do Suru watershed, Santana de Parnaíba, SP, Brazil. The CN {75; 80; 85; 90} increased 3.14, 5.61, 10.90 and 15.85%, respectively. In the most critical situation, runoff was 15.85% higher in estimated CN. The variation of precipitation as a function of T (2, 5, 10, 25, 50, 100 and 500) and application of 11 time of concentration methods designed 132 hydrographs and flow values that were statistically treated in T of Student and in the Analysis of Variance (ANOVA). Except for Bransby Willians associated Cinematic Method, Dooge with Johnstone and CTH with Tsuchyia, the pairs showed degrees of correlation below 59%. The greatest correlation was observed in Jonhstone with Dooge (90%), followed by the Kinematic Method with the Soil Conservation Service Method (83%) and with Dodge (74%). As a result, it was possible to demonstrate the behavior of the SCS parameters to minimize subjectivities and revealing how each parameter impacts the flow of the watershed. Finally, the sensitivity attributed to T was the highest among the three analyzed.

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Seasonal Dynamics of Agricultural Soil Cover in Runoff Generation

Cited by 3 publications

References 33 publications

Light Rain for Runoff and Design Depth

Light Rain for Runoff and Design Depth

Light Rain Characterization in Piracicaba, São Paulo State, Brazil

Sensitivity analysis of rainfall–runoff parameters models to estimate flows

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