An easy to use calculation method for weir operations in controlled drainage systems

Bohne, B.; Storchenegger, Isidor; Widmoser, Peter

doi:10.1016/j.agwat.2012.02.005

Cited by 4 publications

(2 citation statements)

References 12 publications

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“…The farmland drainage projects were old and lacked maintenance. If operated appropriately, drained land may provide large water storage capacity (Bohne et al ., 2012). Drainage projects can serve as vast reservoirs to retain or release water and reduce leaching of nutrients and pesticides from agricultural land (Lalonde et al ., 1996; Wesstrom et al ., 2001; Bonaiti and Borin, 2010).…”

Section: Introductionmentioning

confidence: 99%

Improvement of farmland drainage calculation method under environmental change in Huaibei plain^*

Wang

Zhu

Wang

et al. 2021

Irrigation and Drainage

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Changes and new thoughts are vital if the farmland drainage method in the Huabei Plain is to be improved. In this article, drainage flow was chosen as the research object. Based on long-series precipitation data, the spatial distribution of precipitation was analysed. The peak value relation index (m) was either adjusted or unadjusted in contrast calculations with the empirical formula and the average draining formula. The adjustment rationality and adjustment range of m were researched. Results of calculations were analysed and used to improve the applicability of the empirical formula. The spatial distribution of precipitation showed a decreasing trend from south-west to north-east. Before adjustment, the result of the empirical formula was equivalent to the flow of 1 day of draining water. After adjusting m to 0.84-0.87, the result was equivalent to the flow of 1.5 days of draining water. With the decrease of rainfall frequency, the drainage flow of the average draining formula was greater than that of the empirical formula and the ratio was 1.13 times when the runoff depth was 50 mm. m can be selected from 0.84 to 0.87 for calculating drainage flow in the Huabei Plain by using the empirical formula and has a direct ratio with precipitation.average draining formula, drainage environment, drainage flow, empirical formula, farmland drainage Résumé Des changements et de nouvelles idées sont cruciaux pour améliorer la méthode de drainage des terres agricoles dans la plaine de Huaibei. Dans ce manuscrit, l'objet de recherche est le débit de drainage. Basée sur les données de précipitations à long terme, cette mémoire analyse la distribution spatiale des précipitations. L'indice de relation de valeur de crête « m » a été ajusté ou non dans les calculs de contraste avec la formule empirique et la formule de

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Section: Introductionmentioning

confidence: 99%

Improvement of farmland drainage calculation method under environmental change in Huaibei plain^*

Wang

Zhu

Wang

et al. 2021

Irrigation and Drainage

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“…Previous research showed that the total drainage outflow was a primary factor in N and P losses in paddy fields [11]. Attempts to reduce the nutrient losses in drainage water have led to the promotion of controlled drainage (CD), which has shown the best potential for improving water quality [12][13][14][15]. Large amounts of water outputs saved can be obtained in CD systems [11,16].…”

Section: Introductionmentioning

confidence: 99%

Effects of Controlled Irrigation and Drainage on Nitrogen and Phosphorus Concentrations in Paddy Water

Gao

Shao

et al. 2016

Journal of Chemistry

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Controlled irrigation and drainage (CID) has received attention for improving water quality. Under CID condition, water stress is frequently experienced in two contexts: first drought and then flooding (FDTF) and first flooding and then drought (FFTD). This study aimed to investigate the effects of FDTF and FFTD on nitrogen (N) and phosphorus (P) dynamics in paddy water at different growth stages. The effects of water stress on the migration and transformation of N and P were also investigated. Results showed that CID can decrease N and P concentrations in surface water.NH4+-Nwas the major form of N in surface drainage and percolation water. Mean total phosphorus (TP),NH4+-N, andNO3--Nconcentrations were significantly higher than in FFTD during the growth stage. MeanNH4+-N,NO3--N, and TP concentrations were significantly higher in percolation water under flooding stress than those under drought stress at growth stage, except for mean TP concentrations at milky stage (stage IV). Meanwhile, flooding can sharply increase theNH4+-N,NO3--N, and TP concentrations in percolation water after drought. Thus, without CID, the considerably highNH4+-N,NO3--N, and TP concentrations via runoff and leaching can be responsible for the eutrophication of water bodies in the vicinity of paddy fields during the rice growing season when water stress transforms from drought into flooding.

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Be- und Entwässerung

Lennartz¹,

Widmoser²

2015

Taschenbuch Der Wasserwirtschaft

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An easy to use calculation method for weir operations in controlled drainage systems

Cited by 4 publications

References 12 publications

Improvement of farmland drainage calculation method under environmental change in Huaibei plain^*

Improvement of farmland drainage calculation method under environmental change in Huaibei plain^*

Effects of Controlled Irrigation and Drainage on Nitrogen and Phosphorus Concentrations in Paddy Water

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An easy to use calculation method for weir operations in controlled drainage systems

Cited by 4 publications

References 12 publications

Improvement of farmland drainage calculation method under environmental change in Huaibei plain*

Improvement of farmland drainage calculation method under environmental change in Huaibei plain*

Effects of Controlled Irrigation and Drainage on Nitrogen and Phosphorus Concentrations in Paddy Water

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Improvement of farmland drainage calculation method under environmental change in Huaibei plain^*

Improvement of farmland drainage calculation method under environmental change in Huaibei plain^*