Low water flow


Updated on 06/09/2018
Définition
Sens technique
Minimum stream flow calculated in a given time step during low water periods. For a given year, we will talk about: daily low water flow, low water flow on n consecutive days, monthly low flow - average daily flow in a low-flow month (QMNA). With several years of observation, the statistical processing of series of low flows allows calculating a low- flow frequency. For example, the five-year low water flow (or QMNA 5) is a monthly flow that occurs on average once every five years. The QMNA 5 is the reference low water flow for the implementation of the water policy.
Source
according to the Ministry of the Environment and AFB
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