The spatial distribution of the Surface Water Climate Variable (SWCV) values from the statistical relationships between available water, defined as precipitation minus potential evapotranspiration accumulated over the previous 9 months, and surface-water extent. Greater SWCV values indicate greater change in surface-water extent with increased available water. Surface-water extent was divided between A) disconnected surface water (DCW), or surface-water extent disconnected from the stream network, and B) continuously connected water (CCW), or surface-water extent connected to the stream network.