Hydrological Assessment of Improved Drainage Water Management (DWM) Practices In The Holland Marsh

Session: Poster session

Bhesram Singh, Mcgill University, [email protected]

Abstract

The two-year (2015/2016) study allowed for a hydrological assessment of a field site within the Holland Marsh under DWM. Data collection included discharge, water table observations, meteorological data, soil moisture and water quality. Precipitation for 2015 and 2016 suggests that these years were relatively dry compared to the 30-year average. Excess rainfall, coupled with the snow melt led to discharge at the outlet during the spring season of both years, but the DWM strategy was effective in water conservation, with peak discharge varying between 7.5 to 9.5L/s in 2015 and 3 to 6.5L/s in 2016. This was below typical drainage design criteria of 7 -10L/s for carrots, based on a drainage coefficient of 13mm to 19mm per day. Water table elevations were consistently below 100cm.  Evapotranspiration exceeded rainfall during the growing season of 2015 and 2016 by 10% and 66%, respectively. No irrigation was applied in 2015, while irrigation accounted for 18% of the crop water demand in 2016.  A water balance for the months of June, July and August revealed a net deficit of 75mm and 151mm for the respective years. This suggests the need for further research and to explore the effects of seepage and upward flux.

4. Additional Keyword
Drainage

5. Additional Keyword
Water balance

6. Additional Keyword
evapotranspiration