河道内的砂石是河床的组成部分，是保持河床稳定和水流动力平衡的物质基础。河道内砂石的运移和开挖，直接关系到河势的稳定。因此，在河道内开采砂石是有条件的。至于哪个河段的砂石可以开采，开采多少，河道主管机关进行测算和科学论证后，才能作出批准。开采者必须在批准范 Gravel in the river channel is an integral part of the riverbed and is the material basis for maintaining the stability of the riverbed and the balance of hydrodynamics. The gravel transport and excavation in the river course are directly related to the stability of the river regime. Therefore, the gravel mining in the river is conditional. As to which section of sand can be mined, how much exploitation, river authorities calculations and scientific evidence, to make the approval. The miner must approve it