| Description: | The soil Moisture coefficients used for E15 were incorrect from the time of
installation of the system in program version 8. On 9 July 02 parameter 4 (an offset
value) of program step 136 was changed from 9.5264 to the correct value 0.95264 (this error
had been made by the vendor). The error masked the real problem (wrong soil type) and
after 9 July 02 resulted in very low soil moisture measurements. The coefficients used were
for coarse sand. On 28 Sep 04 I visited the E15 site and found the soil type a fine
sandy clay or fine sandy loam. I changed the coefficients at 1509 GMT to those for a very
fine sandy loam; this produced reasonable soil moistures for the soil type.
The old coefficients in parameters 4 through 9 for step 136 of the program were: 0.95264,
-6.7859, 36.224, -58.619, 25.073, 4.2278
The new coefficients are: 10.241, -27.943, 49.523, -12.648, -52.643, 38.054 |