This section is the geospatial and engineering-visualization archive for HARE Revisited. It documents the project from terrain and drainage through land use, soils, rainfall, command-area and canal reconstruction, HEC-HMS design-flood modelling, SWAT continuous watershed simulation and present sediment evidence. The HEC-HMS reassessment is complete, with an accepted 50-year event peak of 114.4 m³/s at the Hare Weir. SWAT watershed delineation, HRUs, climate preparation and two continuous simulations are also complete for a modelled area of approximately 161.95 km² divided into 17 subbasins. The current engineering focus links the hydrological results with erosion, sediment deposition and the reassessment of the Hare diversion headworks.
The archive presents each map, hydrological figure and engineering visualization as an independent technical product. Select any product once, then use the Previous and Next controls above the large viewer to browse continuously without returning to the title list. The library now follows the full HARE Revisited sequence from terrain and irrigation mapping through HEC-HMS, SWAT hydrology, sediment assessment and field evidence.
Integrated HARE watershed presentation showing land use / land cover over terrain relief, the drainage network, watershed boundary, Hare Weir outlet and Hare River mouth.
Contour presentation for the Hare Watershed, prepared as part of the modern terrain reassessment of the HARE Irrigation Project.
Slope classification of the Hare Watershed for terrain interpretation and the modern reassessment of runoff, erosion, irrigation suitability and engineering constraints.
Annual rainfall distribution across the Hare Watershed for 1990, prepared as part of the historical rainfall reconstruction supporting HARE Revisited.
Geographic location of the Hare Irrigation Project within Ethiopia, showing the project region, surrounding project-area woredas and the Hare watershed in an enlarged locator view.
Soil map of the Hare project area showing mapped units 257 and 310. Both are loam soils with relatively small textural differences. The saturation and drainage comparison shown on the figure is a qualitative texture-based interpretation rather than a measured field saturation result.
Slope distribution prepared for an earlier reconstructed command-area delineation. The present command-area interpretation subsequently evolved through additional GIS, satellite and canal-layout work. The figure remains part of the archive and is useful for terrain interpretation and canal-alignment review.
Land-use and land-cover distribution within the reconstructed HARE command area, presented over terrain relief to show the spatial relationship between crops, trees, built areas, rangeland, water features, drainage and topography.
Satellite-background presentation of the reconstructed HARE command area and principal conveyance network. The map identifies Primary Canal 1, Primary Canal 2, Secondary Canal 1 along the ridge, the Hare River, Hare Weir outlet and Hare River mouth. It forms part of the 2026 reconstruction of the irrigation system as it exists and can be interpreted from present spatial evidence.
Monthly rainfall comparison for the Hare Irrigation Project over the 1981–1990 analysis period, showing seasonal and interannual rainfall variability used in the HARE Revisited hydrological reassessment.
Derived 1-in-5 dry-year rainfall for the 1981–1990 period, prepared to support dependable-rainfall interpretation and irrigation-water planning for HARE Revisited.
Reconstructed longitudinal profile of Primary Canal 1, showing the natural ground profile, canal-bed interpretation and identified drop structures along the alignment developed during the 2026 hydraulic reassessment.
Reconstructed longitudinal profile of Primary Canal 2, showing the natural ground profile, canal-bed interpretation and identified drop structures during the 2026 hydraulic reassessment.
HEC-HMS catchment analysis for the Hare Weir showing five modelled subbasins, mapped land use and weighted SCS Curve Numbers. The HEC-HMS catchment area is 162.035 km². Hydrologic Soil Group C is used and the weighted subbasin Curve Numbers range from 74.62 to 78.94.
Archived sensitivity case from an earlier stage of the HEC-HMS reassessment. It is retained to document the evolution of the analysis and is not the accepted HEC-HMS reference design result. The accepted reference is the completed 50-year simulation with a peak discharge of 114.4 m³/s at Sink-1 / Hare Weir.
Earlier HEC-HMS 25-year simulation retained as part of the technical archive. It documents an intermediate comparison run and should not be read as the present accepted design reference.
Accepted HEC-HMS reference simulation for the 162.035 km² Hare Weir catchment. The adopted 50-year, 24-hour design rainfall is 58.98 mm. Using SCS Curve Number loss, SCS Unit Hydrograph transformation and Muskingum routing, the model produces a peak discharge of 114.4 m³/s at Sink-1 / Hare Weir. The reported runoff depth is 16.84 mm, equivalent to approximately 2.73 million m³ of simulated direct storm runoff.
Preliminary hydraulic-capacity assessment of the existing Hare diversion weir based on the constructed structure and photographic interpretation. Using the measured crest length, an adopted flood head and representative ogee coefficient, the indicative back-calculated capacity is approximately 162 m³/s. This is a preliminary engineering estimate and is not presented as the documented original design discharge.
ArcSWAT watershed delineation developed for the modern HARE reassessment. The SWAT model represents approximately 161.95 km² through 17 subbasins and provides the spatial framework for HRU definition, climate forcing, streamflow, erosion and sediment simulation.
Hydrological summary of SWAT Simulation 2. The continuous model uses the 2020–2025 climate period, with 2020 treated as model warm-up and the later years used for interpretation. Mean annual precipitation is 1665.5 mm, actual evapotranspiration 928.9 mm, surface runoff 267.63 mm and groundwater return flow 182.06 mm. The simulation remains uncalibrated and is interpreted as a current reference model rather than a final calibrated prediction.
Sediment summary from the current SWAT reference simulation. Average upland sediment yield is approximately 58.4 Mg/ha. The strongest simulated hotspot occurs at HRU 160 in Subbasin 6 under the BARR land-use class. The reported 96.23% channel-deposition diagnostic indicates strong simulated in-stream deposition across the modelled channel system; it should not be interpreted as a measured percentage deposited specifically at the Hare Weir. The sediment model is not yet calibrated.
Field evidence documenting substantial coarse and finer sediment accumulation around the present Hare diversion works. The photographs support the need to examine sediment transport, intake alignment, scour and flushing arrangements, sediment exclusion and desilting. No exact sediment depth or deposited volume is inferred from the photographs alone.
These visualizations reconstruct the observed upstream arrangement of the HARE diversion works from field photographs, video evidence and surviving structural details. They are interpretive engineering reconstructions rather than original as-built drawings.
Reconstructed upstream interpretation of the intake arrangement, including the canal intake and the adjacent controlled return path for excess water.
Reconstructed upstream interpretation of the diversion weir, intake, sluice opening and gate-operating arrangements visible in the present field record.
The 1990 annual rainfall map in the main library is supported by three analytical figures: monthly rainfall, seasonal progression and the earlier consolidated watershed-statistics summary.
Monthly mean rainfall over the Hare Watershed in 1990. The twelve monthly values sum to a total annual rainfall of 1,074.11 mm.
Seasonal rainfall pattern of the Hare Watershed in 1990, showing the monthly progression of rainfall and the principal wet and dry periods.
Selected GIS-derived watershed characteristics compiled during an earlier stage of HARE Revisited. The figure is retained as an archival GIS product. Its earlier Hare Weir catchment value has been superseded by the completed HEC-HMS catchment area of 162.035 km². The current SWAT model reports approximately 161.95 km² because of model-specific delineation and reporting.
The main technical library now contains 22 published products, and the historical rainfall viewer adds 3 supporting figures. Together they document the progression from basic GIS reconstruction to hydrological modelling, sediment interpretation and headworks reassessment.
Each layer has a defined role in the reassessment. The GIS work now feeds directly into rainfall analysis, HEC-HMS, SWAT, irrigation reconstruction, sediment interpretation and hydraulic-structure reassessment.
The project location, Hare watershed, Hare Weir outlet and Hare River system are documented through dedicated locator and watershed maps.
The DEM supports terrain interpretation, drainage extraction, contour and slope analysis, canal profiling and watershed delineation. It also provides the terrain basis for the ArcSWAT watershed framework.
Contour and relief products document the watershed terrain and support interpretation of drainage pathways, command-area gradients and canal alignments.
Slope analysis supports runoff and erosion interpretation, irrigation suitability, canal routing and assessment of locations where grade-control structures may be required.
Flow direction, flow accumulation, drainage extraction and outlet-controlled watershed delineation now form part of both the GIS archive and the completed SWAT watershed setup.
Land-use and land-cover information is documented at watershed and command-area scales and is used in irrigation interpretation, HEC-HMS Curve Number estimation and SWAT HRU development.
The archive documents the mapped project soils and their engineering interpretation. Soil information is also incorporated into the hydrological modelling workflow.
The archive contains historical rainfall reconstruction and 1990 spatial products. HEC-HMS uses a separate adopted design-storm framework, while SWAT uses continuous NASA POWER meteorological forcing for the 2020–2025 simulation period.
The current reconstruction documents the command area, Primary Canal 1, Primary Canal 2, Secondary Canal 1, the Hare River and the present irrigation system. PC1 and PC2 longitudinal profiles record terrain and grade-control requirements identified during the hydraulic reassessment.
HEC-HMS provides the accepted event-based 50-year design-flood simulation for the 162.035 km² Hare Weir catchment, with Q50 = 114.4 m³/s. SWAT independently provides continuous watershed behaviour for approximately 161.95 km² through 17 subbasins, including water balance, daily streamflow, groundwater, erosion and sediment processes.
SWAT identifies upland erosion, localized sediment hotspots and strong modelled channel deposition. Field photographs at the Hare diversion independently show coarse and finer sediment accumulation. The next engineering work therefore links catchment erosion control with scour, flushing, intake alignment, sediment exclusion and desilting.
The modern work follows a traceable sequence. Spatial data establish the physical system, HEC-HMS addresses event-scale design flooding, SWAT addresses continuous watershed behaviour, and the resulting hydrology and sediment evidence are carried forward into irrigation and headworks engineering.
The modern work does not overwrite the original HARE study. The 1995 report remains the historical engineering record. Modern GIS, rainfall reconstruction, HEC-HMS, SWAT and field observations form a separate evidence layer that allows the earlier design assumptions and present conditions to be compared transparently.
The archive now contains substantial GIS, rainfall, canal, HEC-HMS and SWAT material. The immediate next stage is no longer simply another watershed model; it is to use the accumulated hydrological and sediment evidence in the engineering reassessment of the Hare diversion headworks.
The spatial archive now connects directly to the original project, the engineering book and the dedicated HEC-HMS and SWAT modelling workspaces.
