T/HNLA 003-2022 Active Group standards

T/HNLA 003-2022 Henan Province Sponge City Construction Technology - Low Impact Development Rainwater Control and Utilization Engineering Design Standards Atlas

T/HNLA 003-2022 Sedimentation control and utilization engineering design standard manual for sponge city construction in Henan province - Low impact development rainwater control and utilization engineering design manual

Publish Date: 2022-10-10 Implement Date: 2022-10-11 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/HNLA 003-2022

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: -

ICS Name: Other

Publish Date: 2022-10-10

Implement Date: 2022-10-11

Scope

Main Technical Content: 3 Terms and Symbols 3.1 Terms 3.1.1 Low Impact Development Low Impact Development refers to the process of controlling stormwater runoff and pollution through decentralized, small-scale source control during site development, abbreviated as LID. 3.1.2 Sponge City Sponge City refers to a city development approach that effectively controls stormwater runoff by enhancing urban planning, construction, and management, and fully leveraging the absorption, infiltration, and retention functions of ecosystems such as buildings, roads, green spaces, and water systems. 3.1.3 Annual Rainfall Volume Capture Ratio The proportion of annual rainfall that is controlled on-site through natural and artificially enhanced infiltration, detention, regulation, and reuse. 3.1.4 Design Rainfall Depth The rainfall control value used to determine the design scale of sponge facilities to achieve a certain annual rainfall volume capture target (annual rainfall volume capture ratio). It is typically obtained from local multi-year daily rainfall statistics and is usually expressed in terms of daily rainfall. 3.1.5 Discharge Runoff Coefficient The ratio of discharge runoff to rainfall during the period of peak discharge. 3.1.6 Volumetric Runoff Coefficient The ratio of total runoff to total rainfall within a specified time period. 3.1.7 Underlying Surface The collective term for surfaces that receive rainwater, including roofs, ground surfaces, and water bodies. 3.1.8 Sunken Greenland Green areas below the surrounding paved surfaces or roads by more than 200 mm. 3.1.9 Green Roof A greening system constructed on the roofs of buildings and structures above ground level, disconnected from the natural soil layer, consisting of a topsoil layer and drainage facilities. 3.1.10 Permeable Pavement A pavement structure composed of a permeable surface layer, base layer, and subbase layer, capable of storing and infiltrating rainwater. 3.1.