EFFECTS OF THE MANAGEMENT OF AGRICULTURAL DRAINAGE ON GROUNDWATER AG & CONSERVATION PARTNER FORUM II June 15, 2011 Douglas W. Toews, P.E.

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Presentation transcript:

EFFECTS OF THE MANAGEMENT OF AGRICULTURAL DRAINAGE ON GROUNDWATER AG & CONSERVATION PARTNER FORUM II June 15, 2011 Douglas W. Toews, P.E.

What are the effects of Drainage Water Management (DWM) on: the hydrologic cycle? the nitrogen cycle?

Water Balance

Nitrogen Balance

Benefits of DWM are achieved by: minimizing drainage flows maximizing ET maximizing N uptake by plants Increasing denitrification Increasing seepage Mitigating increased surface runoff

Reference Skaggs, Youssef, & Chescheir Methods to estimate effects of drainage water management on annual nitrogen losses to surface waters. Department of Biological and Agricultural Engineering, North Carolina State University, Raleigh, NC.