Development and management of the upper, middle and lower reaches of the river?

For the development and management of the upper, middle and lower reaches of the river, the following strategies can be adopted:

* The upper reaches of the river. Here, the main governance principle is flood control, that is, by building reservoirs and planting trees to regulate floods and reduce the impact on the surrounding environment and residents.

* Middle reaches of the river. In the middle reaches, the governance principles are mainly flood diversion and flood storage, and the pressure on the downstream is reduced by building reservoirs and flood diversion and flood storage projects.

* Downstream of the river. In the downstream, the main governance principles are flood discharge and water confinement. It is necessary to strengthen the embankment, dredge the river, and excavate the river to ensure that the flood can be discharged smoothly and reduce the impact on the surrounding environment and residents.

In general, for the development and management of rivers, corresponding measures need to be formulated based on the characteristics of different river sections and the problems that need to be solved. At the same time, the protection of the ecological environment needs to be taken into consideration to ensure the sustainability of development and management.