METHOD TO MONITOR OPERATION OF DRAINAGE SYSTEM Russian patent published in 2012 - IPC E02B11/00 

FIELD: construction.

SUBSTANCE: method includes construction of a drainage system with a distance between parallel drains E and depth of their installation h_d with the depth of retainer location relative to the drain trench bottom T, marking perpendicularly to drains, in their middle along the length, a supervisory range, arrangement of hidden piezometres in the range to monitor water level in the drain h_oi and wells with water-permeable walls to observe level of perched groundwater and soil and ground waters in the space between drains h_i above the drain trench bottom, performance of observations for many years within the drain life of i years over the progress of h_oi, h_i; and a module of drainage q_i, analysis of produced data and its comparison with permissible values. Additionally monitoring is carried out over variation of the averaged coefficient of filtration of drained soils K_fi, including performance in the phase of drainage reduction in the last autumn cycle of drainage action prior to establishment of a solid snow cover, when evaporation from the soil surface is close to zero, at least once per day of observation over h_oi, h_i and q_i, setting the value K_fi using the formula, at the same time for each i year one and the same calculation formula is used to determine K_fi, and its modification with age of the drain - by making of a soil profile of empirical dependence for subsurface horizons.

EFFECT: using the invention will make it possible to produce valid assessment of drainage system operation.

5 cl