Integrated management of irrigation and urban stormwater infiltration
Sample, David J.
Heaney, James P.
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New microscale techniques have become available to assist urban designers in better water management. Urban water management has focused on two different areas: stormwater, and water supply. The focus of stormwater management is shifting towards Low-Impact Development, which emphasizes better management of urban stormwater through reductions in postdevelopment runoff by increasing onsite infiltration. Water supply planning has been enhanced by the emergence of the field of end-use demand management; the focus of much of which has been on outdoor irrigation. Implementation of these two objectives requires evaluation of processes at smaller scales in order to focus on changes being contemplated at a parcel level. A modeling approach is presented which incorporates decentralized options for management of both stormwater and urban water supply. Management options that can be evaluated with this approach include restrictive irrigation policies and rainwater harvesting. A simpler model based upon SCS (Soil Conservation Service) hydrology is then calibrated to the more complex model using a commercially available nonlinear solver. A method for calculation of costs to the consumer and evaluation of total system cost is presented.