GB/T 34968-2017 in English
VALIDGuidelines for the assessment of groundwater overexploitation zones
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 34968-2017地下水超采区评价导则》由332（水利部）归口，主管部门为水利部。
Introduction
Interpretation of the core content of the standard
Classification and grading system of overexploitation areas
| Classification dimensions | Type | Key indicators |
|---|---|---|
| Occurrence medium | Pore water overexploitation area | Aquifer lithology is loose sediment |
| Fissure water overexploitation area | Bedrock fracture development zone | |
| Karst water over-exploitation area | Soluble rock layer distribution area | |
| Renewal capacity | Shallow groundwater over-exploitation area | Average annual water level drop rate>1.0m/a |
| Deep groundwater over-exploitation area | Average annual water level drop rate>2.0m/a |
Comparison of key technical indicators
| Evaluation indicators | General over-exploitation area | Severe over-exploitation area | Monitoring requirements |
|---|---|---|---|
| Exploitation coefficient | 1.0-1.3 | >1.3 | Verification pass rate of measurement facilities 100% |
| Ground subsidence rate | ≤10mm/a | >10mm/a | Combination of InSAR and leveling |
| Ground fissure density | ≤2/100km² | >2/100km² | 3D laser scanning monitoring |
Technical Specifications for Dynamic Monitoring
- Conventional Area: 15-30 eyes/1000km²
- Severely over-exploited area: Densify by more than 50%
Implementation Suggestions
- Data Integration: Establish a GIS database for over-exploited areas, integrating multi-source data such as water level, extraction volume, and subsidence
- Early Warning Mechanism: Initiate emergency response when the extraction coefficient>1.2 or the subsidence rate>5mm/a
- Control Measures: Prioritize Groundwater Recharge and Water Source Replacement Combination Scheme
Standard Evolution Analysis
Compared with the 2003 version of SL286 standard, this version has the following major improvements:
- New deep groundwater overexploitation evaluation indicators (4.4.2.c)
- Refine the quantitative standards for ecological and geological environmental issues (3.6 items)
- Establish an 8-bit unified coding system (Appendix A)
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