Different departments have different regulations.
Hydrological department: Generally speaking, light rain, moderate rain, heavy rain and rainstorm are all measured by daily rainfall. Among them, light rain means that the daily rainfall is below 10 mm; Daily rainfall in moderate rain 10~24.9 mm; The rainstorm rainfall is 25~49.9 mm; The rainstorm rainfall is 50~99.9 mm; The rainstorm rainfall is 100~ 199.9 mm; The rainstorm rainfall exceeds 200 mm.
According to the regulations of China Meteorological Bureau, the rainfall within 24 hours is called daily rainfall, and any daily rainfall below10mm is called light rain,10.0-24.9mm is moderate rain, 25.0-49.9mm is heavy rain, 50.0-99.9mm is rainstorm, and100.0-250. Due to the vast territory of China, a few regions have other regulations according to the specific conditions of Guangdong Province. For example, in rainy Guangdong, if the daily rainfall exceeds 80 mm, it is called rainstorm; In Yan 'an, Shaanxi, where there is little rain, it is called rainstorm when the daily rainfall reaches more than 30 mm. (
2. The most basic knowledge of water conservancy and hydropower
Water conservancy and hydropower engineering trains senior engineering and technical personnel who have knowledge of water conservancy and hydropower engineering survey, planning, design, construction, scientific research and management, and can engage in planning, design, construction, scientific research and management in water conservancy and hydropower departments. Students majoring in water conservancy and hydropower engineering mainly study the basic theories and knowledge of mathematics, mechanics and building structure necessary for the construction of water conservancy and hydropower projects, so that students can get the necessary basic training in engineering design methods, construction management methods and scientific research methods, and have the basic ability of water conservancy and hydropower engineering survey, planning, design, construction, scientific research and management.
Graduates should have the following knowledge and abilities:
1. Solid foundation in natural science, good foundation in humanities and social sciences, and strong comprehensive foreign language ability;
2. Master the basic theories and knowledge of engineering mechanics, fluid mechanics, geotechnical mechanics, engineering geology, engineering survey, engineering hydrology, river dynamics and management;
3. Master the basic theory, knowledge and skills of engineering structure design;
4 master the survey, planning, design, construction and management technology of large and medium-sized water conservancy and hydropower projects and river regulation projects;
5. Strong computer application ability;
6. Have the necessary skills of surveying, mapping, calculation and basic process operation for water conservancy and hydropower projects.
Main subjects: civil engineering, water conservancy engineering.
Main courses: theoretical mechanics, material mechanics, structural mechanics, hydraulics, soil mechanics and foundation, hydraulic reinforced concrete structure, hydraulic engineering materials, hydraulic steel structure, hydraulic engineering economics, engineering geology and hydrogeology, engineering hydrology, engineering survey, water conservancy and hydropower planning, hydraulic structure, hydropower station, hydraulic engineering construction, structural CAD, etc.
Main practical teaching links: including course practice, professional practice, course design and graduation design, in which 1-2 weeks is generally arranged for each course design and 12- 13 weeks for graduation design.
Mainly set up the professional university:
Inner Mongolia Agricultural University Guizhou University Changsha University of Science and Technology Guangxi University Beijing University of Technology Tianjin University Wuhan University Hohai University Tsinghua University Shandong University Sichuan University Zhengzhou University xi University of Technology
Huazhong University of Science and Technology Dalian University of Technology Nanchang University Shenyang Agricultural University Lanzhou University of Technology Lanzhou Jiaotong University Hebei Agricultural University Hebei Engineering University Xinjiang Agricultural University Northeast Agricultural University
Northwest A&F University Three Gorges University Yangzhou University North China Institute of Water Conservancy and Hydropower China Agricultural University Gansu Agricultural University Fuzhou University Hefei University of Technology Ningxia University Kunming University of Science and Technology changchun university of science and technology and other 48 universities.
Employment direction
Graduates can engage in related design, construction, management, marketing and teaching work in water conservancy and hydropower engineering management, design, scientific research institutions, enterprises and institutions and universities, and also engage in related work in civil construction, transportation and municipal engineering.
engage in advanced studies
You can continue to study in hydraulic engineering, water conservancy and hydropower engineering, hydrology and water resources, hydraulics and river dynamics, hydraulic structure engineering, agricultural water and soil engineering, soil and water conservation and desertification control. Every year, about 1/3 fresh graduates are admitted to the graduate school for further study.
3. Basic knowledge of hydropower
Basic knowledge of water and electricity installation 1. Before construction, there must be electrical (strong current and weak current), water supply and drainage design and construction drawings.
2. It is strictly prohibited to lay wires directly in walls, floors, floors or ceilings without any protection. 3, different voltages, different circuits, different signal lines are strictly prohibited to wear in the same threading pipe.
4, the installation of lamps and lanterns should be carried out after the completion of painting. When installing lamps and lanterns on brick-concrete structures, it is forbidden to use wooden wedges, hooks, bolts or expansion bolts.
There shall be no less than 2 bolts (or screws) for fixing lamps. Lamps and lanterns shall not be installed on combustible components.
5. The switch of lamps and electrical equipment must be installed on the "phase line" (that is, the control phase line), otherwise, after the switch is turned off, lamps and electrical equipment will still be charged, which is easy to cause electric shock. 6. There are two protection methods for power system: grounding protection and neutral point protection. At present, grounding protection is widely used in China.
Note that in the same system, it is forbidden to use two protection methods at the same time, otherwise it will cause safety accidents. 7. It is forbidden to use the mobile switch beside the bed.
If the lamp uses a screw cap, the central spring tongue of the screw cap should be connected to the control phase line. 8, line interface should be smooth, even the board connection should be firm.
The junction box of the power inlet box shall be protected by a protection ring (lock nut). 9. In order to update and maintain the conductor in the future, the radian (i.e. cold bending radius) of the bend of the conduit buried in the wall, underground or ceiling should be 5~ 10 times the diameter of the conduit.
10, it is forbidden to connect wires in the threading tube, that is, when the length of wires is not long enough, the connectors of wires cannot be in the threading tube, and wires should generally be connected in junction boxes such as switches, sockets and lamp holders. 1 1. The threading pipe should be of a certain size (thickness), so that the conductor can pass in and leave enough space for the heat generated when the conductor passes through a large current to be radiated.
The ratio of the cross-sectional area of general conductor to the cross-sectional area of threading pipe is 1/3~ 1/2. It is forbidden to block the threading pipe with wires.
12.PP-R pipes and copper pipes can be used for water supply. 13, dark apply water supply pipeline must strictly check whether all connection parts are installed tightly, firmly and in the right direction, and then do water pressure test and test the water for a period of time before embedding.
The general pressure test index is between 0.8 MPa and 1.0 MPa. 14, the horizontal pipe of the drainage pipe should have a certain slope, and the socket should be closely connected to ensure no leakage.
The distance between the bracket and elevator for fixing the pipeline is reasonable and firm. 15, sanitary ware installation position should be accurate, bracket, bracket installation should be smooth and firm.
The floor drain should be installed at the lowest point of the ground and 5 mm deep into the ground. The joint between the toilet and the ground or the nozzle should be sealed with sludge or silica gel. If the cement is not suitable, it will expand and cause the bottom of the toilet to crack.
16. The hot water faucet in the hot and cold faucet should be installed on the left side. Electric water heaters should have grounding protection devices. When it is used for the first time, the air in the bladder should be removed, and it can only be electrified after it is filled with water.
Circuit transformation design and smart home design: For convenience, the live wire is generally red, the control wire is yellow, the zero wire is blue, and the ground wire is yellow-green. High voltage is in the basic part: living room: main lamp, spotlights, light strips, TV sockets, closed-circuit sockets, DVD audio sockets, air-conditioning (cabinet) sockets, telephone plugs and other electrical sockets.
Dining room: refrigerator, water dispenser, hot pot socket, main lamp, spotlight, etc. Bedroom: network cable, telephone line, TV cable, TV socket, dual-control main light, bedside table socket (for mobile phone charging and table lamp).
Study room: network cable, telephone line, closed circuit (for ADSL and watching TV); Toilet: that is, the socket of hot water heater, the socket of electric water heater, the socket with switch (next to the sink, the socket for controlling rearview mirror headlights and hair dryer), and the switch of Yuba. Kitchen: range hood, electric cooker, cooker (rechargeable), disinfection cabinet, water purifier, induction cooker, microwave oven and main lamp.
Basic weak line: the most basic: TV lines in all rooms can be connected in series. The network cable of the study, preferably star wiring.
Telephone lines are used less and less. Unless surfing the Internet, they are generally replaced by network cables (that is, broadband or telephone lines can be used). Smart weak line: home LAN system: it can meet the demand of surfing the Internet in every room at the same time, and can use the TV as a monitor or even as a computer. Home audio-visual system: living room surround sound (5. 1 channel), the background music in each room can be independently controlled, the audio source can be freely selected, and headphones are supported.
Security system: intelligent anti-theft, gas leakage alarm, emergency alarm, etc. Remote control: remote control of water heaters, rice cookers, windows, etc. At home by cell phone.
Intelligent lighting system: With the remote control, you can control all electrical appliances and lights, including curtains, and automatically select the appropriate lights as needed. Description of main material: wire: 2.5 square tube, generally used for lighting and ordinary sockets.
4 air conditioning lines and kitchens use square lines (because there are more appliances in the kitchen). There is also sheath line (the kind with insulation sheath outside the two wires): it is generally used when wiring on the top surface, because the top surface cannot be slotted.
Wiring in the ceiling or copper-core PVC pipe: there are two kinds, one is hard pipe and the other is hose (PVC flame retardant pipe). Hoses are generally used on the ceiling, but now most decoration companies no longer use hoses because they can't pull wires back and forth.
There are three kinds of PVC rigid pipes (heavy, medium and light). Cast-in-place concrete generally uses heavy pipes, because tools such as vibrators are needed, and heavy pipes can bear pressure. In terms of home decoration and wiring, ordinary light pipes can meet the requirements.
Quality requirements: rigid PVC pipes should not be too soft. When you accept it, pinch it with your hand to see if it can be flattened. When the flattened pipe runs on the ground, it is easy for people to walk around to flatten the pipe. Circuit reconstruction materials: wires, conduits, screw connections, direct connections, socket springs, junction boxes, bottom boxes, electrical tapes, etc.
Hydroelectric material requirements (PP-R pipe) Water pipe classification: 1, aluminum-plastic PP-R: Some brands call it "steady-state pipe". PP-R pipe and alloy aluminum are compounded by hot-melt bonding process, which has the sanitary and sealing performance of PP-R, the ultraviolet resistance and oxygen penetration resistance of metal pipe, and the strength is higher. Its expansion coefficient is 1/5 of that of ordinary PP-R.
2. Ordinary pp-r: Hot-melt pipes are mostly decorated with common pipes. Economical and practical, convenient construction, hidden pipeline, long service life, etc.
Recommended materials: Jinde, Jinniu,.