SL/T 796-2020 in English
VALIDTechnical Guidelines for control of flow reduction downstream of small hydropower stations
- Issued on:2020-06-05
- Implemented on:2020-09-05
- File Format:PDF
- Delivery:Via email within 8 business days
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| Standard No: | SL/T 796-2020 |
| Document status: | VALID |
| Title in English: | Technical Guidelines for control of flow reduction downstream of small hydropower stations |
| Title in Chinese: | 小型水电站下游河道减脱水防治技术导则 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 8 business days |
| Issued on: | 2020-06-05 |
| Implemented on: | 2020-09-05 |
| Professional Classification: | SL-Water Resources |
| Related Keywords: | power stations ecological flow guarantee three
new power stations requirements power stations small hydropower stations introduction interpretation ecological flow |
| Related Topics: | power station
dehydration hydropower station Dehydration analysis the river hydropower sub-zero channel small thermal desorption Small thermal desorber Hydropower Station Underwater Inspection small dia technology Waterproof motor Five waters to control water Snail stacking dehydrator technology river water conductivity River water testing Several types of river water sl/t247-2020 |
Introduction
Interpretation of the core content of the standard
| Technical elements | Requirements for new power stations | Requirements for the transformation of existing power stations |
|---|---|---|
| Ecological flow guarantee | Three simultaneous principles (design/construction/commissioning) | Discharge capacity assessment is required |
| Types of discharge facilities | 6 categories including ecological spill holes/valves/gates/siphons/units | |
| Minimum water depth control | ≥0.2m (can be relaxed for special requirements) | |
Key technical requirements
Selection of ecological discharge facilities
According to Article 4.2 of the standard, the selection of discharge facilities needs to consider:
- Hydropower station development method (diversion type/dam-behind type, etc.)
- Water level fluctuation (adjustable valve is recommended for ＞5m)
- Geological conditions (siphon is preferred for arch dam)
Typical case: A 50MW diversion power station in Yunnan adopts a combination of ecological discharge valve + stepped deep pool system to ensure the ecological needs of the 3km river section between the plant and dam.
Implementation suggestions
Joint dispatch of cascade power stations
Article 4.3.2 of the standard emphasizes basin coordination:
- Establish an ecological flow monitoring platform
- Formulate a dynamic dispatch plan (giving priority to ecological flow during the dry season)
- After the implementation of joint dispatch of 6 power stations in a basin in Zhejiang, the number of dry days in the downstream river has been reduced by 82%
Sample only — not a preview of SL/T 796-2020
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