Automation of data input in the A & M watershed model using GIS

Abstract

Integration of hydrologic modeling into a GIS environment can help optimize the use of available digital data while improving the simulation of basin-wide effects of management decisions. This research demonstrates the feasibility of linking predictive hydrologic models in a GIS environment to facilitate urban stormwater management. The A&M Watershed Model was linked to an ARC/INFO database, and the Wolf Pen Creek watershed case study was used to demonstrate the advantages of the method for land use planning. The tool allows planners to simulate basin-wide effects of the consequences of their decisions. The consistency of hydrologic parameter computations allows for reliable analysis of the effects different scenarios would have on the hydrology. The cost effectiveness of different methods to generate the required input for the A&M Watershed Model was compared: the traditional data entry method using paper maps, the use of GIS without automation of data input computations, and the use of GIS with automated data input. The use of GIS databases without automation of model parameter computations provides more consistent hydrologic parameter computations than the traditional data gathering techniques, yet remains labor intensive. With an integrated model, substantial time savings were obtained, mainly by replacing labor time by computer time for routine tasks.