Reconstruction of the water supply system in the village of Berezovka. The first launch complex. Water intake Bor. External water supply networks
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In this work, the issue of water supply in the village of Berezovka was resolved. Hydraulic calculation of networks was performed, at which diameters of pipelines are determined taking into account water consumption of prospective development. Free heads in water ducts are calculated.
The following regulatory documents are used in the development of the project:
- SNiP 2.04.0284 Water supply. External networks and structures
2 General information. Current situation
Berezovsky district is located on the southeastern outskirts of the West Siberian lowland. Extensive space in the area is occupied by the valley of the Yenisei River. Geomorphographically, the site under study is located on the II floodplain terrace of the Yenisei River.
Currently, water supply in Berezovka is provided from two sources. Part of the village - the microdistricts of Shumkov and Remzavod (west of the Berezovka River) and the private development of the hydroelectric power station microdistrict (east of the Berezovka River) - is supplied with water from the water supply system of Krasnoyarsk. From Krasnoyarsk, water is supplied through a water pipeline with a diameter of 200 mm to the village network and to the pumping station. The pumping station was designed by the Krasnoyarsk Civil Project Institute (code 628585) as part of: the pump station building, two clean water tanks of 1400 m3, absorber filters and transformer. Currently, the facilities have been built, but the tanks have not been commissioned, and the pumping station is operating according to a temporary scheme. The institute designed a water conduit with a diameter of 400 mm from plastic pipes from the city networks to the pumping station. The water conduit was partially built, but not commissioned .
Another part of the village - the microdistrict of the hydroelectric station west of private development - is supplied with water from a well water intake located in Bor. Well water quality does not meet sanitary requirements. Water is not disinfected. Sanitary protection zones cannot be maintained. Water from the well is supplied to the water tower and, further, through a water pipeline with a diameter of 100 mm to the breeding network of the village. Due to the low capacity of the water pipeline with a diameter of 100 mm, the head in the water supply network is not enough to water the five-story development of the village.
The village currently has a shortage of water. The cold water supply network does not meet the requirements of water consumers.
According to the operating personnel, the pipelines are in unsatisfactory condition, the service life of the water pipeline is from 20 to 40 years. Water supply networks are mostly dead end. Water pipe material - steel, cast iron, polyethylene. Pipe diameters are not more than 150 mm. It is not possible to determine the exact location of pipe routes and diameters.
The hot water supply scheme of most of the village is open, i.e. hot water supply is carried out from heating networks. In the Remzavod area, cold water is supplied to the boiler room for the preparation of hot water for part of the development of the district.
The Institute of Krasnoyarsk Civil Project (code 602484) in 1985 adjusted the general plan of the village
3 Climatic data
The climate of the region is sharply continental with long cold winters and short hot summers. According to the weather station, the long-term average annual air temperature is - 1.5 ° С with absolute maximum and minimum values of + 32 ° С and minus 48 ° С, respectively.
The average long-term rainfall is 422mm. Of these, liquid - 380 mm.
Thus, physical and geographical conditions here are not very favorable for feeding the upper horizons of groundwater: flat watersheds, a relatively small amount of atmospheric precipitation with high evaporation values. All this affects the aquifer of sediments and, accordingly, the depths of groundwater. Capacity of water wells.
4.2 Water supply systems and diagrams
The source of water supply for the designed development is the water intake structures of groundwater: water intake wells located in Bor, in the floodplain of the Berezovka River and west
Shumkovo microdistrict, Remzavod. Water from the well is supplied to the clean water reservoirs and, further, by the pumping station of the second lift through water pipelines with a diameter of 150 mm to the dilution network of the village.
Water supply system: centralized, combined farm-drinking and fire fighting.
The water supply scheme is as follows: water through main water pipelines is still given to residential areas. Main water pipelines serve to supply water to consumers and for fire protection needs. The pressure in the water ducts is calculated based on the existing guaranteed head at the connection point.
4.3 Calculation of main water pipelines.
Water Network Routing
First of all, the water supply network provides uninterrupted supply of water to consumers. Such a condition is achieved by a ring network.
Network routing provides water supply to all consumers. Due to the fact that the separation of the water supply network into repair sections should ensure, when one of the sections is switched off, the disconnection of not more than five fire hydrants, and the distance between the hydrants is not more than 150 m, the optimal length of the main networks is chosen.
Main water pipelines are laid along roads at a distance of 2.5 m from the roadway. Pipeline transitions under the highway-mi are made in cases. The distance in plan from the edge of the case to the edge of the road is assumed to be 3 m.
Exhaust pipelines are provided at lowered points of each section. Outlet diameters ensure emptying of water duct sections in not more than 2 hours.
The depth of the pipes, counting to the bottom, is taken to be 0.5 m more than the calculated depth of penetration into the ground of zero temperature.
The diameter of the water pipelines and water supply networks combined with the fire protection system shall be accepted as not less than 150 mm.
4.4 Design modes of network operation
The volume and mode of water consumption are constantly changing and are characterized by random events. For calculation, such moments of operation of the system are selected, at which critical values of its indicators (costs, head) are observed.
For the adopted scheme and water supply system, according to SNiP 2.04.0284 p.4.11, calculation of joint operation of water pipelines and pump station, hydraulic linkage of ring networks are made for the following characteristic modes:
- per hour of maximum water consumption,
- per hour of fire (maximum hourly flow rate and design flow rate
- per hour of minimum water consumption.
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