Based on the credit standing and ability of headman, ROSCA forms many measuers to keep away risk. 因此，从总体来看，互助会以会首的信誉和能力为基础，形成了一系列的风险防范措施。
If authorities are neglectful of keeping these systems in good condition, the drainage ditches will fail to carry off rainwater fast enough to prevent flooding. 如果当局疏于保养这些系统，这些排水沟便无法迅速排放雨水防范淹水。
