README This script is a simple php script that compares data from the USGS NWIS system with data posted by the NWS on AHPS. Installation Requirements: PHP 5.x or greater PEAR PEAR-Log PEAR-Cache_Lite Example command line usage: //Compare all sites in Alaska php ahps_usgs_compare.php -a AK //Compare all sites in Alaska without graphs php ahps_usgs_compare.php -a AK -g //Compare one site in Alaska php ahps_usgs_compare.php -a AK -s SIXA2