This specification is applicable to hydrological station network construction, hydrological testing, third-, fourth-, and fifth-level leveling measurements of hydrological surveys, zero-point elevation measurements of water gauges, river section measurements, and topographic measurements below limits.
SL 58-1993 history
2014SL 58-2014 Specification for geodesic survey in hydrology
1993SL 58-1993 Technical standard for general geodesic survey in hydrology