Longhua's water supply management is mainly for the following operations: first, the operation of large houses, bridges, water maintenance in basements, maintenance and various water protection engineering designs. Ii. Construction waterproofing works include: waterproofing of houses, waterproofing of bridges, waterproofing of basements, waterproofing of cavities, waterproofing of tunnels, waterproofing of toilets, waterproofing of external walls, waterproofing of swimming pools, waterproofing of various metal surfaces and waterproofing of concrete surfaces. Leakage works: first, basement, underground garage, swimming pool, toilet, underground tunnel, leakproof water control works. 2. Work on the cracking of the roof, the breach of the wall, the corner of the wall, and the leaking water belt. 3. Cracks, stretches, seams and leaks in the various buildings and underground concrete works. Subway, cable ditches, culverts, sewage treatment tanks, landfills to protect against seepage and ...