Structure. Flood assembled around the wells primarily consists of four parts. (1) unit hoardings. Unit hoardings are assembled around the main part of the well. Unit consists of three parts hoardings flaps, reinforced angle iron and fittings and other components. Retaining plate for high strength PVC plastic plates, processing through a special process, with tensile and impact strength advantages; reinforced angle iron (two specifications were: L40 × 40 × 4 and L25 × 25 × 3) to improve the overall strength of the unit hoardings; Ф32mm of connection holes for steel, side 2, a total of four, in order to connect unit hoardings; every five hoardings have a set of drainage holes, drainage hole diameter should be for 50mm, corresponding hoardings specifications are drainage holes height 60cm, 70cm and 80cm. (2) fasteners. Ф21mm steel fasteners for a length of 2.0,1.7 and 1.5m, respectively 1.5,1.2 and 1.0m for confining wells, its main role is to connect and fixed unit hoardings. (3) drainage system. Drainage system constituted by the band members drain plug, the main role is to adjust the water level around the wells. (4) sealing systems. Sealing system unit hoardings between composite geomembrane (GT150g / m2 / GE0.2mmPE / GT150g / m2), is used to prevent leakage between the units hoardings. 2.3 Key indicators: (1) unit hoardings Size: Width 1.0m, height of 1.0, 1.2 and 1.5m respectively. (2) around the well size: according to the actual situation and the requirements of dangerous rescue piping assembly, piping orifice is generally 8 to 10 times the diameter. (3) around the borehole depth: according to the actual situation and the requirements for piping dangerous rescue by the drainage system around the wells to adjust its depth. (4) Unit hoardings Weight: 19.5kg (height 1.5m); 17.5kg (height 1.2m); 16.0kg (height 1.0m).