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I I I I I I I I I I I I I I I I I I I AYRES /\CL~r:j;Ct-::: .:[:~,.- :,~:~-') have also developed specialty experience in customizing the GIS interface using Avenue, ArcObjects, and Visual Basic. In order to efficiently incorporate data and information collected in the field, a highly accurate handheld GPS unit with mobile GIS capabilities will be used during site visits and fieldwork. The handheld GPS unit that will be used is the GeoExplorer CE Series from Trimble. This real-time corrected (differential correction) GPS receiver has sub- meter accuracy with post-processing support for extra precision. The unit uses the Windows CE 3.0 operating system with a fast (206 MHz) processor and sufficiently large memory (32 Mb RAM, 512 Mb Flash memory) to allow for the rapid loading and manipulation of large graphics files (e.g., georeferenced topographic maps and aerial photography) and GIS databases. New ArcView or other GIS databases can be developed in real-time, existing GIS data and information can be maintained and edited, and new data and information can be collected and incorporated into existing databases in the field using ESRI's ArcPad. Software is available that allows the unit to link ground photos from a digital camera to a GPS position and incorporate them into the GIS database. Recognizing the growing role of GIS in engineering applications, Ayres Associates conducted an internal "GIS Technical Conference" in August of 2002 that was attended by more than 30 engineers, managers, and corporate officers. Several staff members from the Colorado offices, including Scott Hogan and Jason McConahy, were instrumental in developing and presenting the technical aspects of the conference. We continually look for new or improved applications of GIS in water resources and hydrology. This helps us to maintain flexibility in our approach for applying GIS to meet the specific goals of a project. TASK 2: CLIMATOLOGY The hydrometeorology is inseparable from hydrology and as such the hydrometeorology will be completed as integral to Task 3 Watershed Hydrology under the general direction of Mr. Laiho. Applied Weather Associates (AWA) will provide meteorological support for the South Boulder Creek project in support of Task 2 Climatology. The analyses provided will evaluate the climatic conditions along the central portion of the Colorado Front Range with emphasis on extreme rainfall meteorological conditions that could potentially cause flooding in the South Boulder Creek basin. Meteorological analyses of extreme rainfall meteorological conditions that could potentially cause flooding in the South Boulder Creek basin will include both deterministic and statistical approaches using state-of-the-science methods. The deterministic approach will evaluate extreme rainfall Colorado storms that have been observed along the Front Range and quantify meteorological conditions associated with these storms for constructing an up-to-date history of extreme rainfall events for the central Front Range of Colorado. An extreme rainfall climatology would be constructed based on all available meteorological stations in the area including NWS Cooperative stations, FAA/NWS sites, RAWS (Remote Automated Weather Station) sites and Hourly Precipitation gauges. Updated precipitation frequency estimates will be calculated using the current approach used by the National Weather Service in their 12