Optimization of cumulative trapped sediment curve for an arid zone reservoir: Foum El Kherza (Biskra, Algeria)

Figures & data

Table 1  Principal characteristics of Foum El Kherza Dam and its drainage area

Labiod catchment		Foum El Kherza Reservoir
Area (km^2)	1300	Location	Lat. 35°51′08″N, Long. 5°55′30″E
Mean annual inflow (hm^3)	25.90	Type	Combined arc-gravity
Max altitude (m NGA)	2326	Height (m)	73
Min altitude (m NGA)	189	Crest level (m NGA)	203.85
Concentration time (h)	16	Initial capacity (hm^3), impounded in 1950	47
Drainage density (km km^-2)	3.8	Actual capacity (hm^3), last bathymetric survey 2007	12.90
Mean annual rainfall (mm)	230.50	Purpose	Irrigation of 300 000 palms; electricity abandoned
Mean sediment yield (hm^3)	0.6

Fig. 1 Foum El Kherza dam location map.

Fig. 2 Daily inflows to Foum El Kherza Reservoir.

Table 2  Descriptive statistics of daily inflows

Count	x mean	Sd	x median	x max	x min	Cv	Cs
	(hm^3)	(hm^3)	(hm^3)	(hm^3)	(hm^3)
15 978	0.0714	0.457	0.005	25.209	0	6.39	24.6
Sd: standard deviation; Cv: coefficient of variation; Cs: coefficient of skewness.

Fig. 3 Cumulative storage loss at Foum El Kherza Reservoir over time.

Table 3  Some values of intercept a from Algerian studies

Study	Wadi	Area	a
		(km^2)	(kg m^-3)
Touaibia et al. (2001)	Mina	4126	1.05–10.10
Terfous et al. (2001)	Mouillah	2650	0.4082
Achite and Ouillon (2007)	Abd	2480	1.710
Khanchoul et al. (2007)	Kebir West	1130	0.8927
Khanchoul and Jansson (2008)	Mellah	550	0.48
Khanchoul and Remini (2009)	Bouhamdane	1105	0.21–0.55
Cherif et al. (2009)	Mekerra	1890	5.7191
Khanchoul et al. (2012)	Kebir	681	0.86

Fig. 4 Optimized cumulative trapped sediment curve (CTSC) at Foum El Kherza Reservoir.

Table 4  Trap efficiency, TE, of Foum El Kherza Reservoir

Year	C (hm^3)	I (hm^3)	C/I	TE (%)	CTSC
				Brune curve
1950	47	−	−	−	−
1967	35.07	21.103	1.66	98	−
1975	31.925	18.98	1.68	98	85
1986	26.519	20.48	1.29	98	99^(a)
1993	24.313	18.202	1.33	98	94
2001	16.744	16.66	1.00	98	75^(b)
2004	14.739	90.52	0.16	91	99^(c)
2007	12.9	36.82	0.35	95	61^(b)
C: reservoir capacity; I: annual inflow.
^(a) Bottom outlet broken down; ^(b) efficient spilling; ^(c) dry period.

Fig. 5 Annual sediment balances, showing both sediment inputs and releases.

Fig. 6 Cumulative storage loss at Foum El Kherza Reservoir from bathymetric surveys (BSC), CTSC approach and prior studies.

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