New Mexicos Dynamic Statewide Water Budget (NMDSWB) NMDSWB Project - - PowerPoint PPT Presentation
New Mexicos Dynamic Statewide Water Budget (NMDSWB) NMDSWB Project Goals Provide a water accounting process for the State of New Mexico Where the water is How water is used and where it goes Identify gaps in knowledge about
Land Surface Groundwater Human Storage and Distribution Systems Surface Water
and changes in storage are assumed to be zero
natural water ways that can be diverted or impounded for human use. No change in storage through time. At each timestep, the fluxes into and out of this stock are balanced.
storage impoundments or distribution systems, such as public water supplies, irrigation canals, and reservoirs. When water is added to storage in a reservoir, it is considered a diversion of available surface water to the human storage system, and when it is released from storage, it is considered a return to the available surface water system.
unknown except for select aquifers throughout the state. Currently the DSWB does not estimate groundwater storage, but it does track changes in storage over the selected time of a model run.
GWd SWr SWd ETh Land Surface SW to GW ETGW ETSW1 GWr Precip Groundwater Recharge Human Storage and Distribution Systems GWIn ETSW2 SW Out SW In GWOut Surface Water
aggregated for given spatial scale
to zero to allow for calculation of GW storage chage
Hargreaves reference ET estimate
human/diversions/consumption/ estimated return flows
system on all non-human terms. Recharge = baseflow + ETgw + GWout – GWin
Land Surface. Landsurface ET = Precip – Recharge
ungaged SW return flows
Water System
1. Climate Change Scenarios – Temperature, precipitation, surface water flows (GCM- data) 2. Human Population growth – Model impacts of growing demands for water in public and domestic water use sectors (High and low population growth forecasts) 3. Changes in water use and efficiency –
efficiencies
use