Colorado State University. Department of Civil Engineering, authorColorado Agricultural Experiment Station, authorColorado State University, Colorado Agricultural Experiment Station, publisher2019-08-012019-08-011961-10https://hdl.handle.net/10217/196119CER61NAE71.October 1961.Includes bibliographical reference (page 9).technical reportsengCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.Drain-tilesFilters and filtrationText