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Quantitative assessment of water resources by the method of the hydrological balance in the Kadey catchment area (East-Cameroon)
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Quantitative assessment of water resources by the method of the hydrological balance in the Kadey catchment area (East-Cameroon)
Groundwater is recharged naturally by rain and snow melt and to a smaller extent by surface water (rivers and lakes)
- components: In the hydrological balance, it is necessary to know the calculation of different processes of the hydrological cycle such as precipitation (P), evapotranspiration(ETR), surface runoff (ES), and infiltration (I). P=ETR+ES+I (Tabue Youmbi, 2013; Fontang et al., 2016; Kouassy Kaledje et al., 2016)
- However, since the rain is a known datum, ETR remains determined by the Coutagne method (the Turc and Thornthwaite methods do not make it possible to establish the hydrological balance in this type of region as Djeuda Tchapnga et al. (1999) and R (runoff) by the Tixeront-Berkaloff method.
- * Estimation of potential evapotranspiration and actual evapotranspiration (1948 -Thornthwaite)
- where, T = Average monthly temperature in ° C; I = Annual heat index, which is equal to the sum of 12 values of the monthly heat index (i) = (T / 5) raised to 1.514; a= function of the annual index (I), which simplified equates to 0.016 raised to 0.5. a is calculated as: a = 0.00000675 * I ^ 3 - 0.0000771 * I ^ 2 + 0.01792 * I + 0.49239; F = correction factor for the number of days of the month (Ndi) and the astronomical duration of the day Ni-hours of the sun, where F = Ndi / 30 * Ni / 12
- * Estimate of runoff, After studying a set of basins, Tixeront and Berkaloff established a relationship whose simplified form gives runoff
- With R: runoff in mm; P: mean annual precipitation in mm; ETP: average annual potential evapotranspiration calculated by the Thornthwaite method in mm.
- Estimation of infiltration It is calculated by difference with the other parameters that is to say:
- * Estimation of potential evapotranspiration and actual evapotranspiration (1948 -Thornthwaite)
- However, since the rain is a known datum, ETR remains determined by the Coutagne method (the Turc and Thornthwaite methods do not make it possible to establish the hydrological balance in this type of region as Djeuda Tchapnga et al. (1999) and R (runoff) by the Tixeront-Berkaloff method.
- components: In the hydrological balance, it is necessary to know the calculation of different processes of the hydrological cycle such as precipitation (P), evapotranspiration(ETR), surface runoff (ES), and infiltration (I). P=ETR+ES+I (Tabue Youmbi, 2013; Fontang et al., 2016; Kouassy Kaledje et al., 2016)
