SL/T 820-2023 in English

VALID

Specifications on ecological flow computation and discharge design for water and hydropower projects

Issued on:2023-08-07
Implemented on:2023-11-07
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $1,300.00
$1,261.00

Standard No:	SL/T 820-2023
Document status:	VALID
Title in English:	Specifications on ecological flow computation and discharge design for water and hydropower projects
Title in Chinese:	水利水电工程生态流量计算与泄放设计规范
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2023-08-07
Implemented on:	2023-11-07
ICS Classification:	27.140-Hydraulic energy engineering
Chinese Classification:	P59-Water power engineering
Professional Classification:	SL-Water Resources
Related Keywords:	ecological flow ecological flow computation ecological base flow ecological flow calculation system discharge buildings discharge
Related Topics:	water conservancy hydropower project Steady State Velocity Calculations Flow meter production Calculation flow meter Process and Quality Secondary Wiring Design of Water Conservancy and Hydropower Projects Water Calculation Quantity calculation Reclaimed water flow meter Reclaimed water flow meter Bioengineering and Equipment Production of flowmeters around Hydrological process Water Resources and Hydropower Moisture determination calculation flow calculation vent Moisture determination calculation time ecology Water Resources and Hydropower Engineering Water Conservancy and Hydropower Design Estimates Standard dry flow calculation Mold waterway flow calculation method Water conservancy and hydropower engineering automation design Energy-saving design of water conservancy and hydropower projects Flowmeter selection specifications sl/t 595 2023 sl/t 820 sl/t 820-2023 sl 820 Design of pressure steel pipes for water conservancy and hydropower projects sl/t820-2023

Introduction

Analysis of the core content of the standard

Technical elements	Calculation method	Applicable scenarios
Ecological base flow	Q_p method/Tennant method/Frequency curve method	Maintaining the basic form and self-purification capacity of rivers and lakes
Flow in sensitive period	Ecohydraulics method/Habitat analysis method	Special ecological needs such as fish breeding period
Lake water level	Morphological analysis method/Water balance method	Inland lakes and tailwater lakes

Key technical points

Ecological flow calculation system

The standard establishes a graded and classified calculation framework:

Ecological base flow adopts the driest month flow with a guaranteed rate of 90%-95%
Sensitive period flow needs to be combined with the biological characteristics of indicator species
Rivers with high sediment content need to calculate the sediment transport volume during the flood season separately

Implementation suggestions

Design principles for discharge facilities

Give priority to the use of existing discharge buildings
Discharge according to the inflow flow at dead water level
Set up a remote monitoring system

Technical requirements for monitoring

The monitoring section should be set at: the outlet of the discharge facility, the confluence of the tailwater and the discharge, and the frequency of data collection should not be less than once a day.

Standard evolution analysis

Compared with SL/T 712-2015, this standard adds:

Overall calculation method of ecological flow (BBM method)
Evaluation system for unique natural landscapes involving water
Requirements for coordinated dispatch of cascade power stations

More samples: QC/T 942-2021 JGJ 94-2008 GB 50021-2001(2009)

Sample only — not a preview of SL/T 820-2023

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