"is usually underestimated" is a correct and usable part of a sentence in written English.
You can use it to describe a situation or phenomenon that is often downplayed or not fully acknowledged. It can also be used to express a personal belief or opinion about something that is not given enough importance. Example: The importance of mental health is usually underestimated in our society, but it is crucial for overall well-being.
On the other hand, since the study basins are located in mountainous region of north Laos characterized by convective rainfall and orographic rainfall, where satellite rainfall amout is usually underestimated, and it might be the cause of underestimation of simulated streamflow peaks.
"Extinction is usually underestimated.
Badge cost is a recurring cost that never ends and is usually underestimated.
The empirical results confirm the effects of social interaction, which is usually underestimated in the current research, on player segmentation.
However, it is usually underestimated or even neglected due to the measurement under an unfavorable experimental condition (Winter et al. 2014).
This function is usually underestimated by academics, but is essential for enhancing the resilience of farming systems (Dawson et al. 2014).
The imposed throughflow into rotating parallel disk system is to decrease temperature rise of hydro-viscous film flow, but the induced Coriolis effects are usually underestimated on torque transmission.
However, the k-NN estimates at the pixel level tend to average towards the population mean and to have suppressed variance, since large values are usually underestimated and small values overestimated.
Besides, it does not account for changing production conditions and thus cannot always provide a reliable estimate of recoverable hydrocarbons in place, and changing gas properties with time (reservoir pressure) are not accounted for; thus, gas reserves are usually underestimated.
Those cracks that were detected were usually underestimated by the tool.
Indeed, we expected time ratios below one, as longer durations are usually underestimated [13].
