Fig. 5. Continuously measured and modeled shrinkage curves (SCs) for three alluvial soils in the Lower Majerda Valley, Tunisia, using the retractometry procedure. The graph on the right hand side shows the fit for the whole data range. One out of three points is represented. The parameters determined by software for soil hydrostructural characterization (CARHYS) are shown in Table 4. The cumulative variation curves of the water pools, w_re, w_bs, w_st, and w_ip, added to V_s are represented referring to as (1), (2), (3), and (4), respectively. Points A, B, C, D, E, and F are the transition points of the shrinkage phases defined by the exponential model (XP) and represented on the corresponding water pools curves.