Heads for central and observation wells to facilitate observation of dynamic levels

Abstract

Central well. When organizing experimental pumping, the dynamic water levels in the central well are usually left out of observations, as the water-lifting pipe is filled with emulsion masking the position of the dynamic level. To observe dynamic levels, a special observation well of small diameter (piezometer) in the immediate vicinity of the central well is installed, and it is called a downhole observation well. At deep occurrence of the dynamic level in the aquifer, the sinking and anchoring of the downhole well becomes difficult. It is very convenient to replace such a well with a piezometric tube lowered into the central well next to the air pipe. If the lower edge of the piezometric tube is immersed 5-10 m below the mixer, the water in it is completely free from the impact of air supplied to the central well and set at a level corresponding to the dynamic level in the central well and aquifer. It remains only to periodically measure the position of this level with a level gauge. B.P. Ostroumov's level gauge is convenient.