First of all, it is worth noting that the period after the rupture corresponds to a deficit phase in the studied basin. Despite the dryness of the post-rupture period, all maximum flow ranges did not experience significant changes during the latter period (Figure 6). The 3-day maximum flow recorded the largest increase (+0.55%), and the largest deficit (−0.76%) was noted for the 30-day maximum flow (Table 7). A slight reduction in the variability of maximums is also noted during this period, which appears greater in the case of the short-term ranges (1-day to 7-day), for which the coefficients of variation decrease from 26% before the rupture to 23% after (Table 7). The maximums appear earlier in Mbalmayo after the rupture. Their average Julian observation date reduced from 318 before the rupture to 309 after the rupture (Table 7).
Table 7

Statistics relating to the maximum and minimum flows of the studied basin before and after the rupture identified

Mean values (m3/s)
Cv (%)
Change
Before ruptureAfter ruptureBefore ruptureAfter rupturem3/s%
IHA statisticsMbalmayo
Minimum flows 
 1-day minimum 25.5 17.9 0.30 0.41 −7.6 −29.7 
 3-day minimum 26.2 18.2 0.30 0.41 −8 −30.6 
 7-day minimum 27.8 19.4 0.30 0.38 −8.4 −30.5 
 30-day minimum 41.5 26.5 0.28 0.36 −15 −36.3 
 90-day minimum 82.9 58.6 0.31 0.29 −24.4 −29.4 
Maximum flows 
 1-day maximum 366.9 366.6 0.26 0.23 −0.3 −0.08 
 3-day maximum 363.6 365.6 0.26 0.23 2 0.6 
 7-day maximum 361.2 362.5 0.26 0.23 1.3 0.4 
 30-day maximum 340.8 338.2 0.26 0.25 −2.6 −0.8 
 90-day maximum 274 271.7 0.25 0.25 −2.3 −0.8 
Average Julian dates       
 of minimum 61 67     
 of maximum 318 309     
Mean values (m3/s)
Cv (%)
Change
Before ruptureAfter ruptureBefore ruptureAfter rupturem3/s%
IHA statisticsMbalmayo
Minimum flows 
 1-day minimum 25.5 17.9 0.30 0.41 −7.6 −29.7 
 3-day minimum 26.2 18.2 0.30 0.41 −8 −30.6 
 7-day minimum 27.8 19.4 0.30 0.38 −8.4 −30.5 
 30-day minimum 41.5 26.5 0.28 0.36 −15 −36.3 
 90-day minimum 82.9 58.6 0.31 0.29 −24.4 −29.4 
Maximum flows 
 1-day maximum 366.9 366.6 0.26 0.23 −0.3 −0.08 
 3-day maximum 363.6 365.6 0.26 0.23 2 0.6 
 7-day maximum 361.2 362.5 0.26 0.23 1.3 0.4 
 30-day maximum 340.8 338.2 0.26 0.25 −2.6 −0.8 
 90-day maximum 274 271.7 0.25 0.25 −2.3 −0.8 
Average Julian dates       
 of minimum 61 67     
 of maximum 318 309     
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Figure 6
Evolution of minimum and maximum flows over 1–90 days of homogeneous periods before and after the rupture/break in the Nyong watershed. The broken lines indicate the mean and the solid lines indicate the standard deviation.
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Evolution of minimum and maximum flows over 1–90 days of homogeneous periods before and after the rupture/break in the Nyong watershed. The broken lines indicate the mean and the solid lines indicate the standard deviation.

Figure 6
Evolution of minimum and maximum flows over 1–90 days of homogeneous periods before and after the rupture/break in the Nyong watershed. The broken lines indicate the mean and the solid lines indicate the standard deviation.
View largeDownload slide

Evolution of minimum and maximum flows over 1–90 days of homogeneous periods before and after the rupture/break in the Nyong watershed. The broken lines indicate the mean and the solid lines indicate the standard deviation.

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