Audit report on the Iowa Communications Network (ICN) for the year ended June 30, 2008

Audit report on the Iowa Communications Network (ICN) for the year ended June 30, 2008

Audit report on the Student Health Facility Revenue Bond Funds of Iowa State University of Science and Technology for the year ended June 30, 2009

Audit report on the Student Health Facility Revenue Bond Funds of Iowa State University of Science and Technology for the year ended June 30, 2009

Audit report on the City of Murray, Iowa for the year ended June 30, 2009

Audit report on the City of Murray, Iowa for the year ended June 30, 2009

Sampling and TDR probe insertion in the determination of the volumetric soil water content

Volumetric soil water content (theta) can be evaluated in the field by direct or indirect methods. Among the direct, the gravimetric method is regarded as highly reliable and thus often preferred. Its main disadvantages are that sampling and laboratory procedures are labor intensive, and that the method is destructive, which makes resampling of a same point impossible. Recently, the time domain reflectometry (TDR) technique has become a widely used indirect, non-destructive method to evaluate theta. In this study, evaluations of the apparent dielectric number of soils (epsilon) and samplings for the gravimetrical determination of the volumetric soil water content (thetaGrav) were carried out at four sites of a Xanthic Ferralsol in Manaus - Brazil. With the obtained epsilon values, theta was estimated using empirical equations (thetaTDR), and compared with thetaGrav derived from disturbed and undisturbed samples. The main objective of this study was the comparison of thetaTDR estimates of horizontally as well as vertically inserted probes with the thetaGrav values determined by disturbed and undisturbed samples. Results showed that thetaTDR estimates of vertically inserted probes and the average of horizontally measured layers were only slightly and insignificantly different. However, significant differences were found between the thetaTDR estimates of different equations and between disturbed and undisturbed samples in the thetaGrav determinations. The use of the theoretical Knight et al. model, which permits an evaluation of the soil volume assessed by TDR probes, is also discussed. It was concluded that the TDR technique, when properly calibrated, permits in situ, nondestructive measurements of q in Xanthic Ferralsols of similar accuracy as the gravimetric method.

Audit report on the Office of Treasurer of State, Iowa Educational Savings Plan Trust for the year ended June 30, 2009

Audit report on the Office of Treasurer of State, Iowa Educational Savings Plan Trust for the year ended June 30, 2009

Audit report on the City of Denison, Iowa for the year ended June 30, 2009

Audit report on the City of Denison, Iowa for the year ended June 30, 2009

Audit report on the Perry Municipal Waterworks, Perry, Iowa for the year ended June 30, 2009

Audit report on the Perry Municipal Waterworks, Perry, Iowa for the year ended June 30, 2009

Audit report on the City of Knoxville, Iowa for the year ended June 30, 2009

Audit report on the City of Knoxville, Iowa for the year ended June 30, 2009

Audit report on the South Dallas County Landfill Agency for the year ended June 30, 2009

Audit report on the South Dallas County Landfill Agency for the year ended June 30, 2009

Audit report on the Shelby County Area Solid Waste Agency for the year ended June 30, 2009

Audit report on the Shelby County Area Solid Waste Agency for the year ended June 30, 2009

Audit report on the City of Armstrong, Iowa for the year ended June 30, 2009

Audit report on the City of Armstrong, Iowa for the year ended June 30, 2009

Audit report on the City of Le Grand, Iowa for the year ended June 30, 2009

Audit report on the City of Le Grand, Iowa for the year ended June 30, 2009

Audit report on the City of Elkhart, Iowa for the year ended June 30, 2009

Audit report on the City of Elkhart, Iowa for the year ended June 30, 2009

Audit report on the Iowa Agricultural Development Authority for the year ended June 30, 2009

Audit report on the Iowa Agricultural Development Authority for the year ended June 30, 2009