Catchment Water Allocation Tool (CaWAT)
Catchment Water Allocation Tool (or CaWAT) is a Microsoft® Excel-based computer decision support system for rural water resources management to support integrated irrigation and aquaculture development in small to medium watersheds. The tool allows for a number of interventions to be made in an interactive manner in the development, allocation and use of water resources to support rural livelihoods through the integration of agriculture, aquaculture and domestic uses.
Global Environmental Flow Calculator (GEFC)
The Global Environmental Flow Calculator (GEFC) is a software package for desktop rapid assessment of Environmental Flows (EFs). The EF estimation technique in GEFC is using monthly time step series reflecting “natural” / unregulated flow conditions and its corresponding Flow Duration Curve (FDC)- a cumulative distribution function of flows. The FDC is represented by 17 percentage points on the probability (X) axis. EFs aim to maintain an ecosystem in, or upgrade it to some prescribed or negotiated condition – “Environmental Management Class (EMC).” The higher the EMC, the more water is needed for ecosystem maintenance and more flow variability needs to be preserved.
Options AnalysiS in Irrigation Systems (OASIS)
OASIS (Options AnalysiS in Irrigation Systems) is a planning model for medium to large-scale canal irrigation systems (typically several thousand hectares). It specifically takes account of surface-groundwater interactions to assess the impacts on water use, depletion and productivity of a broad range of interventions in irrigated agriculture. Examples of such interventions include: lining of canals, development of storage, and introduction of alternative cropping patterns, water deliveries and on-farm irrigation practices. The model can thus be used to provide guidance to irrigation system managers and water policy-makers to make a more efficient and productive use of limited water resources in agriculture in the context of rising food demand, competitive water use from other sectors and the uncertainties brought about by climate change.
PODIUMSim
PODIUMSim provides a framework to develop scenarios of water and food supply at river basin, sub-national and national level. It is an interactive tool that runs on a personal computer, and has a Microsoft Excel interface which has been configured using Visual Basic programming language code.
Population pressure and increasing water competition in a changing climate require us to take stock of the availability and use of water across scales. Water availability not only influences farmers’ commercial prospects but also irrigation-related enterprises and agri-businesses. Greater water scarcity could jeopardize irrigation and agricultural markets while excessive water use can lead to declining ecosystems, water quality and soil health. IWMI advises development partners and the public and private sectors on all aspects of water resource availability and use through a variety of advanced modeling and remote-sensing products and tools, including 
The ability of farmers to engage in or expand irrigation depends on the prevailing socioeconomic, ecological and political contexts, which are often complex, non-linear and changeable. Overcoming systemic barriers to farmer-led irrigation development while taking advantage of existing opportunities 
A lack of affordable credit, particularly for women and resource-poor farmers, is one of the main barriers to expanding farmer-led irrigation in low- and middle-income countries. But 
Scaling farmer-led irrigation requires strengthening human capacity and knowledge exchange among all actors and stakeholders involved. IWMI takes an action research approach, working with national and international research institutions, governments, extension agents and public and private organizations to co-develop the scaling ecosystem and strengthen capacity to drive scaling networks and collective action. We support the