DRAINMOD

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DRAINMOD
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RAINFALL or IRRIGATION (P)
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FIELD STUDY
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Observed and Predicted Cumulative 6-Year
Subsurface Drainage and NO3-N Loss (Plot 2,
1992-1997)
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Orifice Weir Outlet at Cozier Tract near Carteret
site
Flat weir
Upstream
Pressurized Flow From 15 cm diameter Orifice
Downstream
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Effect of 10cm diameter orifice weir in watershed
D3 on outflow rates as compared to uncontrolled
conditions. (Amatya et al., 2000)
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FIELD TESTING OF DRAINMOD

• NORTH CAROLINA
• LOUISIANA
• FLORIDA
• GEORGIA
• ILLINOIS
• IOWA
• MICHIGAN
• INDIANA
• VIRGINIA
• CALIFORNIA
• MARYLAND
• OHIO
• MINNESOTA
• South Carolina
• SOUTH DAKOTA

• ONTARIO
• QUEBEC
• ENGLAND
• EGYPT
• INDIA
• ISRAEL
• FINLAND
• FRANCE
• BELGIUM
• AUSTRALIA
• SWEDEN
• TURKEY
• MALAYSIA

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Watershed
Basin
Field
Watershed
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Field Scale Processes

• Tim Appelboom Sediment from Forest Roads
• Agita Mohamed RO and Sediment, Drained Land
• Haney Salem Modeling Flow to Drains
• Wan Luo DRAINMOD for Cold Conditions
• Mohamed Youssef DRAINMOD-NII
• Mike Burchell Effect of Drain Depth on N Loss
• Johnny Grace Impacts of Forest Manag. Practices
• L. Arnold Effects of Drainage design on N Loss
• J. Diggs Modeling N loss form Drained Forests

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In-Stream Processes

• Francois Birgand Modeling In-Stream Processes in
  Agricultural Canals in the Lower Coastal Plains
• Tim Appelboom In-Stream Processes in forested
  Canals in the Lower Coastal Plain

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Watershed Scale

• Jennifer Shelby Hydrology and Water quality
  Following the Hurricanes and Storms of 1999
• Glenn Fernandez (Research Associate), Dr.
  Devendra Amatya, Dr. G.M. (Chip) Chescheir
• Numerous watershed scale studies and models as
  given in the reference list and subsequent slides.

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STREAM PROCESSES

• Hydraulics, Channel Flow
• Velocity, Flow Rate, Stage,
• Travel Time
• Transport
• Hydrodynamic dispersion, ADR, slug flow
• In-Stream Nutrient Losses or Retention
• Detailed description of processes or lumped
  parameter, first order reaction (CCoe-kt)

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Models for Drained Watersheds
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Models for Drained Watersheds
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NO3-N Load kg/ha/yr
Outlet
0.0 - 1.2
1.2 - 2.4
2.4 - 3.6
3.6 - 4.8
4.8 - 6.0
6.0 - 7.2
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NO3-N Load kg/ha/yr
Outlet
0.0 - 1.2
1.2 - 2.4
2
2.4 - 3.6
x2.2
1
3.6 - 4.8
SD1.0
x1.1
4.8 - 6.0
SD0.5
6.0 - 7.2
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OBJECTIVES

• Learn basic theory and concepts of DRAINMOD
• To understand the model inputs and how they may
  be measured or approximated
• Apply DRAINMOD to
• - Analyze the hydrology of poorly drained soils,
  including wetlands,
• To describe the performance of drainage and
  related water management systems,
• To optimize the design of those systems,
• To quantify effects of drainage system design on
  hydrology and quality of drainage water.

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OBJECTIVES (cont.)

• Controlled Drainage and Subirrigation
• Analysis of wetland hydrology, delineation and
  restoration
• Modeling storm water bio-retention areas
• Drainage design for on-site waste treatment
• Effect of drainage design on wastewater treatment
  by land application
• Effect of drainage design and management on N
  losses
• Drainage design for control of soil salinity

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Carsamba, Turkey
2
1.5
Drainage flow rat in cm/day
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0.5
0
30
40
50
60
70
80
90
Day of year (1994)
measured
original DM
modified DM
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Carsamba, Turkey
50
60
70
Water table depth in cm
80
90
100
110
30
40
50
60
70
80
90
Day of year (1994)
measured
original DM
modified DM
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Drainage System Parameters
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Soil Property Inputs
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Crop orVegetation Inputs
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DRAINMOD Outputs(both tabular and graphical
forms)

• .out .day .mon .yr Hydrologic summaries
• Example DHB.mon would contain the monthly
  summaries for project DHB DHB.yr the yearly
  
• summaries, etc.
• .yld .cro Crop yield summaries
• .wet Wetland Summaries

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MODEL DESCRIPTION NITROGEN CYCLE
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Field Scale Processes
Hydrology DRAINMOD
Nutrient Loads Nitrogen DRAINMOD-N,
DRAINMOD-NII Sediment, P, Pesticides DRAINMOD/CR
EAMS

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Average Monthly Drainage for 40 yr Period from
1955 to 1994 in Kinston, NC
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Average Monthly Drainage for 25 yr Period from
1972 to 1997 near Lamberton, MN(DRAINMOD
Simulation)
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