Snowmelt runoff rate (M), which serve as a source of water for irrigation, water supply, and power, are a function of the precipitation (P) incident to the snowpack and the mean daily temperature (T).

Using the following data, derive a relationship for predicting M from P and T.

P (cm/day) T (°C) M (cm/day) P (cm/day) T (°C) M (cm/day)

0.0 1 0.24 0.6 8 1.14 0.5 2 0.44 0.0 11 1.57 0.2 3 0.49 0.0 12 1.58 0.0 3 0.54 0.3 13 1.68 0.0 5 0.78 0.2 16 2.10 0.8 6 0.88 0.4 18 2.41 0.5 7 1.01