The use of remote sensing data in design, monitoring, and evaluation of irrigation systems is becoming popular due to rapid advances in remote sensing technology, ease of access to data, and decreasing costs of obtaining and processing the data. Satellite spatial resolution as fine as 30 meters is available and the remote sensing data, combined with adequate cropland information, can provide detailed analyses not otherwise available. The technology is also particularly suitable for river basins and large irrigation systems in developing countries where available resources are generally not enough for field surveys, and data collection and reliable recorded data are limited. This study used remote sensing satellite data and field observations to assess the irrigation performance of the Chubek Irrigation System (CIS) in Tajikistan, as part of the Water Resources Management in Pyanj River Basin technical assistance (TA) project financed by the Asian Development Bank (ADB).2 The map on p. 2 provides information about the components of the CIS and satellite remote sensing data from the study.