32. If by reason of the construction of any specified work or of the failure of any such work the efficiency of any drainage work for flood defence purposes is impaired, or that drainage work is otherwise damaged, such impairment or damage must be made good by Network Rail to the reasonable satisfaction of the lead local flood authority and if Network Rail fails to do so, the lead local flood authority may make good the impairment or damage and recover from Network Rail the expense reasonably incurred by it in so doing.