When is the flood control period generally in a year? What supplies need to be stocked?

1. Flood control period time:

Based on the analysis of rainfall, flood occurrence patterns and meteorological causes, the flood seasons of my country's seven major rivers are roughly divided as follows:

2. Reserves Materials:

Flood control materials mainly involve flood control and rescue materials, which is the abbreviation of flood control and rescue materials. They mainly include two categories: flood control and rescue tools and equipment and flood control equipment and materials.

1. Materials that need to be reserved for flood prevention:

General small materials include expansion bags, woven bags, rescue ropes, water life-saving equipment, and lighting equipment; large materials: flood control sand bags, Stones, wood piles, emergency lighting, assault boats, etc.

2. Commonly used tools for flood prevention and rescue:

There are hammers, hammers, axes, hand saws (chicken tail saws), electrician pliers (or bolt cutters), mills, shovels, iron Anchors, as well as new generation flood prevention and rescue tools such as pneumatic pile planting machines, life-saving throwers, life buoys, life jackets, and flood prevention lighting fixtures.

3. List of materials:

1. Sand

Sand is the main material for flood control and emergency rescue, and it is also the fine aggregate in concrete pouring. Generally, natural sand (river sand, sea sand, mountain sand, etc.) is used, which requires good gradation (that is, uniform thickness and fineness). The average particle size is generally used to divide sand into four grades:

① Coarse sand, with an average particle size of more than 0.50mm;

② Medium sand, with an average particle size of 0.35mm to 0.55 mm;

③Fine sand, the average particle size is 0.25mm~0.35mm;

④Extra-fine sand, the average particle size is below 0.25mm.

2. Pebbles

Gravel is mainly used for laying the filter layer in flood control and emergency services. As the coarse aggregate of the reverse filter layer, the gravel should be properly graded and clean. When stones are used as coarse aggregate in concrete, they should also be required to have sufficient hardness and durability. There are two types of stones usually used: natural stones and artificial stones.

Natural gravel refers to gravel or river pebbles obtained by manual or mechanical digging and screening in the river bed.

Gravel is made from various hard rocks (granite, quartzite, limestone, sandstone, basalt, etc.) that are manually or mechanically broken and properly screened.

3. Block stones

Block stones are also called "Mao Xing" or "flake stones". They are stones obtained directly from blasting. They have irregular shapes or only one or two natural planes. , materials commonly used for building dam banks and flood control and rescue operations in the lower reaches of the Yellow River, are distributed in dangerous work, control, guidance and beach protection projects on the lower reaches of the Yellow River, and are reserved according to the principle of "taking care of the key points and taking into account the general". According to the different weight and size of the stones, they can be divided into two categories: general lump salt and large stones.

(1)General stone. Each piece weighs 20kg~75kg and is often used to build the above-water part of the dam bank. Stones weighing less than 30kg shall not be used in underwater throwing projects, and the proportion of a single stone weighing 20kg to 30kg shall not exceed 20% of the total weight. Stones used for flood control in the lower reaches of the Yellow River are required to be mined, transported and stored according to the standard of "general block stones".

(2) Large rocks. Each piece of garbage weighs 75kg to 150kg, or heavier, and is mostly used for the upper span angle of the dam and the mulch area at the front.

4. Stones

Stones are relatively regular natural stones that are mined manually or mechanically and are chiseled and processed manually. According to the different degree of surface smoothness, it can be divided into four types: rough stone, coarse stone, semi-fine stone and fine stone. The rough stone is mostly used to build stable dams, stacks, bank protections, bridges and culverts and other projects.

To sum up, gravels and blocks are used in large amounts in flood control and rescue operations. They are the main reserve materials near flood control projects. They can be used if the danger is greater or when large-scale closure and closure projects use a lot of stones. The method of temporarily transporting stones will be supplemented. Block stones are used for riprap mulch, pillow support, sinking and drainage, riprap and dam bank protection. It is required to use hard, unweathered and larger stones.

Extended information

Flood and flood control safety knowledge:

1. Natural disasters such as landslides, collapses, mudslides and flash floods are prone to occur during the flood season.

2. Always listen to weather forecasts, pay close attention to weather changes, understand disaster forecasts, and do a good job in flood prevention and self-protection. We should conscientiously study the knowledge about disaster prevention and relief during the flood season and improve our self-protection capabilities.

3. Do not visit or stay in areas prone to flash floods (rivers, beaches, low-lying areas).

4. Do not stay in dangerous areas or dangerous buildings prone to landslides, collapses, mudslides, etc.

5. Do not play or play in streams, rivers, ponds, reservoirs and other water bodies.

6. If you need to cross a river, you need to find a bridge. Do not wade through rivers, streams, or rivers, and do not risk crossing streams or rivers.

7. Do not fish or play in streams, rivers and other waters.

8. Try not to go out when encountering disastrous weather. Those who have gone out should find safe areas to avoid disasters and protect themselves.

9. Memorize the school’s emergency signals, emergency transfer routes and locations. When emergency transfer is required, follow the school’s unified command and transfer safely in a timely and orderly manner.

10. When in danger on the way, do not panic and make mistakes. You should quickly avoid danger and save yourself or find ways to seek help. Do not take risks.

Reference materials:

Baidu Encyclopedia-Flood Control Materials

China Meteorological Administration-Main Flood Seasons of the Seven Major Rivers in the Country