31381048[hydraulic structures by function]PT2026-03-30 20:42:48BT31350790hydraulic structuresPTNT31378722damsPTNT31416902erosion protection worksPTNT31416905flood protection worksPTNT31416909land reclamation worksPTNT31416912water distribution structuresPTNT31416915drainage structuresPTNT31416918stream gauging stationsPT