Belcher, H. W. and G. E. Merva. 1987.  Results of DRAINMOD verification study for Zeigenfus soil and Michigan climate.  ASAE Paper No. 87-2554. Asae, St. Joseph, Michigan.

Brakensiek, D. L. and W. J. Rawls. 1982. An infiltration based runoff model for a standarized 24-hour rainfall.

Chang, A. C., R. W. Skaggs, L. F. Hermsmeier and W. R. Johnson. 1983. Evaluation of a water management model for irrigated agriculture. Transactions of the ASAE. 26(2):412-418, 422.

Deal, S. C., J. W. Gilliam, R. W. Skaggs and K. D. Konyha. 1986. Prediction of nitrogen and phosphorus losses as related to agricultural drainage system design.  Agri. Ecosystems and Environment, Vol. 18:37-51.

Ernst, L. F.  1975.  Formulae for groundwater flow in areas with subirrigation by means of open conduits with a raised water level.  Misc. Reprint 178, Institute for Land and Water Management Research, Wageningen, The Netherlands.  32 pp.

Evans, R. O., R. W. Skaggs and R. E. Sneed.  1990.  Normalized crop susceptibility factors for corn and soybeans to excess water stress.  Transactions of the ASAE, In Press.

Evans, R. O., R. W. Skaggs and R. E. Sneed.  Stress day indices to relate corn and soybean yield to excessive soilw ater conditions.  Transactions of the ASAE, In Review.

Fipps, G. and R. W. Skaggs. 1987. Effect of lateral seepage on water table response to a parallel drainage system. Transactions of the ASAE. 29(5):1278-1283.

Fouss, J.L., R. L. Bengston and C. E. Carter. 1987. Simulating subsurface drainage in the lower Mississippi Valley with DRAINMOD. Transactions of the ASAE. 30(6):1679-1688.

Gayle, G., R. W. Skaggs and C. E. Carter. 1985. Evaluation of a water management model for a Louisianna sugar cane field. J. of Am. Soc. of Sugar Cane Technologists. Vol 4. 4:18-28.

Green, W. H. and G. Ampt.  1911.  Studies of soil physics, part I. the flow of air and water through soils.  J. Agricultural Science, 4:1

Hardjoamidjojo, S., R. W. Skaggs and G. O. Schwab. 1982. Corn Response to excessive soil water conditions. Transactions of the ASAE. 25(4):922-927, 934.

Hiler, E. A.  1969.  Quantitative evaluation of croprequirements. Transactions of the ASAE, 12(3):499

Kirkham, D.  1957.  Theory of land drainage, In , Drainage of Agricultural Lands, Agronomy Monograph No. 7, American Society of Agronomy, Madison, Wisconsin.

Luthin, James N., 1978. Drainage Engineering. John Wiley and Sons, Inc., New York.  250 pp.

Massey, F. C., R. W. Skaggs, and R. E. Sneed. 1983. Energy and water requirements for subirrigation vs. sprinkler irrigation. Transactions of the ASAE. 26(1):126-133.

McMahon, P. C., S. Mostaghimi and F. S. Wright. 1988. Simulation of corn yield by a water management model for a coastal plains soil. Transactions of the ASAE. 31:734-742.

Mengel, D. B. and S. A. Barber.  1974.  Development and distribution of the corn root system under field conditions.  Agronomy Journal, 66:341

Mohammad, F. S. and R. W. Skaggs. 1983. Drain tube opening effects on drain inflow. J. Irrigation and Drainage Engineering. 109(4):339-404.

Muskat, M., 1937. The flow of homogeneous fluids through porous media.  McGraw-Hill, New York. 763 pp.

Nolte, B. H., et al. 1986. Program Design Documentaion for the Water Management Simulation Model in the North Central States. North Central Computer Institute, 610 Walnut Street, Madison, WI 53705.

Rawls, W. J., D. L. Brakensiek and K. E. Saxton.  1982.  Soil water characteristics.  Transactions of the ASAE, 25(5):1316-1328.

Rawls, W. J., D. L. Brakensiek and B. Soni.  1983.  Agricultural management effects on soil water processes.  Part I.  Soil water retention and green and ampt infiltration parameters.  Transactions of the ASAE 26(6):1747-1752.

Ravelo, C. J.  1977.  A rational approach for incorporating crop needs into drainage system design.  Ph.D. Thesis, Agricultural Engineering Department, Texas A & M University, College Station, Texas.

Rogers, J. S. 1985. Water management model evaluation for shallow sandy soils. Transactions of the ASAE. 28(3):785-790.

Seymour, Rose Mary. 1986. Corn-yield response to planting date in eastern North Carolina. Master's Thesis, Biological and Agricultural Engineering Department, North Carolina State University, Raleigh, NC 27695.

Shaw, R. H., 1974. A weighted moisture stress index for corn in Iowa. Iowa State Journal of Research. 49(2):101-114.

Shaw, R. H., 1978. Calculation of soil moisture stress conditions in 1976 and 1977. Iowa State Journal of Research. 53(2):119-127.

Skaggs, R. W. 1981. DRAINMOD Reference Report. Methods for design and evaluation of drainage-water management systems for soils with high water tables. USDA-SCS 329 pp.

Skaggs, R. W. 1982. Field evaluation of a water management simulation model. Transactions of the ASAE. 25(3):666-674.

Skaggs, R. W., N. R. Fausey and B. H. Nolte. 1981. Water management evaluation for North Central Ohio. Transactions of the ASAE. 24(4)922-928.

Skaggs, R. W., S. Hardjoamidjojo, E. H. Wiser and E. A. Hiler. 1982. Simulation of crop response to surface and subsurface drainage systems. Transactions of the ASAE. 25(6):1673-1678.

Skaggs, R. W. and A. Nassehsadeh-Tabrizi. 1986. Design drainage rates for estimating optimum drain spacing. Transactions of the ASAE. 29(6):1631-1640.

Susanto, R. H., J.Feyen, W. Dierickx and G. Wyseure. 1987. The use of simulation models to evaluate the performance of subsurface drainage systems. Proc. of the Third International Drainage Workshop, Ohio State Univ. pp. A67-A76.

Thornthwaite, C. W.  1948.  An approach toward a rational classification of climate.  Geog. Rev., 38:55