配水系统中的氯衰变部分是由管壁反应产生的氯消耗造成的。管壁的反应性是管径、流速、管道材料的性质、沉积物的数量和性质等的函数。已进行了初步研究和现场试验，以评估各种参数对液/固界面反应产生的氯气消耗的影响。结果表明:管壁对氯气总消耗量的影响取决于管道的几何形状（表面/体积比），随着直径的增大，管道水反应性的贡献减小；水动力条件影响氯衰变率——氯向表面扩散的传质可能是一个限制因素，在层流条件下，观察到氯衰变率降低；氯浓度水平也与整个配电网中的氯衰变率有关- 氯气浓度越低，氯气消耗率越高。中试和足尺实验的结果证实，根据表观一级动力学可以预测氯的衰变。这些结果还表明，配电网建模需要考虑许多参数。在将这些结果整合到质量模型中后，可以根据材料、水质、水力条件等的每种配置制定更精确的氯化策略。

Chlorine decay in distribution systems is created in part by the consumption of chlorine due to reaction at the pipe wall. Reactivity of the pipe wall is a function of pipe diameter, flow velocity, nature of the pipe material, amount and nature of deposits, etc. Pilot studies and field experiments have been performed to evaluate the influence of various parameters on the chlorine consumption due to reactions occurring at the liquid/solid interface. Results show that: the influence of the pipe wall in the overall chlorine consumption depends on the geometry of the pipes (surface/volume ratio) with an increasing diameter, the contribution of pipe water reactivity is reduced; hydrodynamic conditions affect the rate of chlorine decay - chlorine diffusional mass transfer toward the surface can be a limiting factor and in the case of laminar flow conditions, one observes a reducing of the rate of chlorine decay; and the chlorine concentration level is also involved in the rate of chlorine decay throughout the distribution network - the lower the chlorine concentration is, the higher the rate of chlorine consumption is. Results obtained from pilot and full scale experiments confirm that chlorine decay can be predicted according to apparent first order kinetics. These results also show that modelling in the distribution network needs to take into account numerous parameters. A more precise strategy of chlorination adapted to each configuration of material, water quality, hydraulic conditions, etc. will be possible after the integration of such results in the quality model.