unit convertion

• R2Q: Q(m^3/s) = R(mm) * area (km^2) * 1000/(3600*24)

• W2mm: 1 MJ /m2/day =0.408 mm /day, 1 Watt /m2 = 0.0864 MJ /m2/day

R2Q(R, area = dt * 3.6, dt = 24)

Q2R(Q, area = dt * 3.6, dt = 24)

MJ_2W(x)

MJ_2mm(x)

W2_MJ(x)

W2mm(x, tmean = 0)

K2T(x)

T2K(x)

deg2rad(deg)

rad2deg(rad)

Arguments

R

runoff (mm per dt)

area

basin area (km^2), if area = ,

dt

time duration (hour)

Q

runoff flow (m^3/s)

x

scalar or numeric vector

tmean

daily mean temperature

deg

angle in degree

rad

angle in radian

References

http://www.fao.org/3/X0490E/x0490e0i.htm