307
edits
Changes
沙坝
,no edit summary
If done timely, the maintenance required is not costly. Small malfunctions in the dam however can lead to destruction of the entire dam. Therefore, the dam should be regularly checked for cracks and damage. Particularly after floods, and extreme temperature changes cracks are likely. These need to be repaired as soon as possible by a trained mason. During the dry season, raised-sand dams should be raised by a maximum of 50 cm if the reservoir has filled up.如果及时维护，所需的维护成本并不会很高。然而即使是沙坝出现小故障，也能导致整座沙坝遭到毁坏。因此需要定期检查沙坝有无裂缝和损坏。尤其是在洪水过后，以及极端气温变化之下，沙坝很有产生裂缝。这些裂缝需要尽可能及时地由熟练的石匠进行修复。在旱季，如果水库是满的，则沙坝需要提升到最高50厘米的范围内。
Further, the outlet and upstream riverbed should be cleaned regularly to make sure the dam does not get blocked. Silt, rocks, dead animals, etc. should be removed regularly. This can also help prevent contamination of the water. The quality of the water in the well should be checked, once in a while, by an expert. 而且，出水口和上游河床需要定期清理，确保沙坝不会堵塞。淤泥、石块和动物死尸等需要定期清除。这也能帮助防止水污染。井中的水质需要间或由专家进行检查。
Maintenance can normally be carried out by the users of the system or by a caretaker or watchman. Larger repairs may require skilled labour, which can usually be provided by local craftsmen. In some cases, unskilled labour may be required on a large scale (e.g. for repairing a broken raised-sand dam, or a leaking subsurface dam). The labour may be provided by the users (with or without pay), or by other people who are hired for the purpose.
