ENVR 202 Lecture Notes - Lecture 4: Evapotranspiration
3 Sep 2018
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Most renowned method, daily estimate (for grass: must use appropriate coefficient) 4: g: how hot the soil was (heating of soil from day before and following day) I(cid:374)(cid:272)ludes so(cid:373)e physi(cid:272)al para(cid:373)eters that for(cid:272)e et to happe(cid:374), (cid:271)ut it"s also e(cid:373)piri(cid:272)al so (cid:449)e (cid:272)a(cid:374)(cid:374)ot deri(cid:448)e it (cid:894)it"s (cid:271)ased o(cid:374) (cid:373)odel data(cid:895) Cannot be more than 5-8mm/day (can help you figure out if you did something incorrect) Note: the table on slide 5 is crop coefficients for the usa, so it might not be the best for our field area of study. Net radiation depends on latitude of the area. Make sure to do the practise on slide 6. If solar radiatio(cid:374) (cid:272)a(cid:374)"t (cid:271)e fou(cid:374)d, use slide (cid:1011) & (cid:1012) Slide 9 use the latitude and the 80% sunlight. Good hydrologic conditions: infiltration is occurring and moving slowly as it percolates (equitable stream flow) Poor hydrologic conditions: fast rates of runoff and stream flow is overbanked.
