6.1.6 Asset Data Confidence Asset data is constantly being updated and checked. The Council Assets and Services department is converting their hard copy asset records to Geographical Information System (GIS) and an electronic asset management Information System. The two systems are intrinsically linked. The spatial information on the location of assets, zones and catchments area are kept in the GIS whilst the individual attributes of the assets are stored in the AMIS. Information sources include as-built drawing from when the asset was first built. These are obviously created when the asset was installed and can consequently be quite old. Quality can be variable and many drawings are in imperial measurements. Recent as-built drawings can be either hard- copy or electronic CAD drawings. These are carefully scrutinised by the Asset Development Officer and the asset will not be accepted for adoption by council until it meets the specified standard. Various surveys have been undertaken over time. Often plans and long-section drawings are produced and data such as depth and invert levels of underground pipes recorded. CCTV surveys of stormwater pipelines are generally undertaken to investigate specific problems or confirm particular requirements. The surveys are reviewed by engineering staff and pipe condition grades are assessed and recorded. The location of laterals can also be ascertained and recorded. Applications for connections from the main to properties are kept as separate records. Property records often record the location, size and material of underground services within the property boundary. The repairs and maintenance operatives return records of the assets they have worked on. The quality of the records has been variable with little consistency. The primary aim of the recently introduced asset management information system is to increase the quality and consistency of this data. The improvement will only be achieved through careful training and mentoring of field staff. A- Highly reliable - Data based on sound records, procedures, investigations, and analysis, documented properly and recognised as the best method of assessment. Data set is complete and estimated accuracy is +/-2%. B- Reliable - Data based on sound records, procedures, investigations, and analysis documented properly but has minor shortcomings, for example some data is old, some documentation is missing and/or reliance is placed on unconfirmed reports or extrapolation. Dataset is complete and estimated to be accurate to +/-10%. C- Uncertain - Data based on sound records, procedures, investigations, and analysis which is incomplete or unsupported or extrapolated from a limited sample for which grade A or B data are available. Dataset is substantially complete but 50% is extrapolated data and accuracy is estimated +/_25%. D- Very Uncertain - Data based on unconfirmed verbal reports and or cursory inspection and analysis. Dataset is substantially complete and most data is estimated or extrapolated. Accuracy +/-40%. E- Unknown - None or very little data held. Page 84