Susfalk, R. B., Epstein, B., Goreham, J., Young, M. H., Moran, E. A., Martain, C., Gates, T., Swihart, J., Smith, D. L., Fitzgerald, B. C. (2006). Use of Polyacrylamide to Reduce Seepage from Unlined Water Delivery Canals: San Francisco, CA