Impact of Technology Decisions on Water Availability

Sub-Basin
Time Period
Land Use
Change
Irrigation
Technology
Results

Select a Sub-Basin

Select a Time Period

Present (1990-2010) Near Future (2011-2040) Distant Future (2041-2060)

Land Use Change

Current Land Use (%)

New Land Use (%)

Rangeland:

Irrigated Rice:

Rainfed Rice:

Irrigated Maize:

Rainfed Maize:

Land use that can not be changed

Water:

Forest:

Wetland:

Total:

Select an Irrigation Technology

	Scenario	Irrigation Tech. Level	Canals	Water Use Managed	Type of Weeding	Water Returned	Fields Leveled	Flooded vs. Pivot	% Water Use Efficiency
	Scenario 1	Current methods	Unlined	No	Hand	No	Poor	Flooded	15%
	Scenario 2	Improved surface	Cement lined, gates	Yes	Hand	No	Poor	Flooded	30%
	Scenario 3	Semi-mechanized	Cement lined, gates	Yes	Herbicide	Some	Moderate	Flooded	60%
	Scenario 4	Mechanized	Central lines / pipes, gates, lined	Yes	Herbicide	Yes, pumped	Good	Pivot	85%

Selected Scenario: | Selected Time Frame:

Initial Values

Land Use Type	Current Land %	Current Land Km	Dry Season (June-Oct) Water Use (mm)	Wet Season (Nov-May) Water Use (mm)	Annual water use (mm)	Crop Production Tonnes

New Values

Land Use Type	New Land %	New Land Km	Dry Season (June-Oct)		Wet Season (Nov-May)		Annual		Crop Production Tonnes
Land Use Type	New Land %	New Land Km	Water Use (mm)	Flow Change (m3)	Water Use (mm)	Flow Change (m3)	Annual water use (mm)	Flow Change (m3)	Crop Production Tonnes

Impact on Flow To DownStream sub-basin
Sub-basin	Initial in-flow (m3/sec)	Converted in-flow (m3/sec)	Impact (m3/sec)

USAID: From the American People

Michigan State University

University of Dar es Salaam

United Republic of Tanzania