Static Features

Static features in RECLAIM represent long-term physical, design, and catchment attributes of reservoirs that remain relatively constant over time. These variables are derived primarily from the GRILSS v1.2 dataset (Minocha and Hossain, 2025a,b) and several complementary global datasets, including GLC-SHARE, HWSD v2.0, and SRTM30_Plus. They include reservoir characteristics, catchment attributes, land cover, soil, and terrain properties that influence sedimentation processes.

Reservoir and Catchment Attributes

The table below summarizes all static reservoir and catchment features used in RECLAIM. OSY-OEY defines the period of sedimentation observed. DL stands for dimensionless.

No	Name	Abbrev.	Description	Units
D4	Built Year	BY	Year in which the construction of reservoir finished	X
P1	Original Built Capacity	OBC	Original design capacity of the reservoir	million cubic meter (MCM)
P2	Dam Height	HGT	Height of the impoundment of the reservoir	meter
P3	Major River Basin	MRB	Name of the major river basin in which the reservoir is located	X
P4	Latitude	LAT	Geographical latitude of the impoundment	degree
P5	Longitude	LON	Geographical longitude of the impoundment	degree
P6	Reservoir Area	RA	Nominal surface area of reservoir estimated using reservoir polygon	sq km
P7	Reservoir Perimeter	RP	Nominal perimeter of the reservoir estimated using reservoir polygon	km
P8	Flow Length	FL	Shortest distance from reservoir inlet to dam outlet within reservoir	km
P9	Catchment Area	CA	Catchment area of the reservoir	sq km
P10	Differential Catchment Area	DCA	Incremental catchment area excluding upstream reservoirs	sq km
P11	AEC Slope	AECS	Mean slope of the area-elevation curve of the reservoir	km²/m
P12	AEC Curvature	AECC	Mean curvature of the area-elevation curve of the reservoir	km²/m²
P13	AEC Concavity Index	AECI	Ratio of area under straight line connecting min/max elevation to actual AEC	DL
P14	Land Cover - Artificial Surfaces	LCAS	Percentage of catchment covered by artificial surfaces	%
P15	Land Cover - Cropland	LCC	Percentage of catchment covered by cropland	%
P16	Land Cover - Grassland	LCG	Percentage of catchment covered by grassland	%
P17	Land Cover - Trees	LCT	Percentage of catchment covered by dense trees	%
P18	Land Cover - Shrubs	LCS	Percentage of catchment covered by shrubs	%
P19	Land Cover - Herbaceous Vegetation	LCHV	Percentage of catchment covered by herbaceous vegetation	%
P20	Land Cover - Mangroves	LCM	Percentage of catchment covered by mangroves	%
P21	Land Cover - Sparse Vegetation	LCSV	Percentage of catchment covered by sparse vegetation	%
P22	Land Cover - Bare Soil	LCBS	Percentage of catchment covered by bare soil	%
P23	Land Cover - Snow and Glaciers	LCSG	Percentage of catchment covered by snow and glaciers	%
P24	Land Cover - Water Bodies	LCWB	Percentage of catchment covered by water bodies	%
P25	Dominant Land Cover	DLC	Dominant land cover type in the catchment	X
P26	Coarse Soil Composition	COAR	Mean percentage of coarse particles in the catchment soil	%
P27	Sand Composition	SAND	Mean percentage of sand in the catchment soil	%
P28	Silt Composition	SILT	Mean percentage of silt in the catchment soil	%
P29	Clay Composition	CLAY	Mean percentage of clay in the catchment soil	%
P30	Bulk Soil Density	BULK	Mean bulk density of the catchment soil	g/cm³
P31	Elevation	ELEV	Mean elevation of the catchment above sea level	meter
P32	Slope	SLOP	Mean ground slope within the catchment	degrees
P33	Curvature	CURV	Mean surface curvature of the terrain	DL
P34	Aspect	ASP	Mean orientation of slopes measured clockwise from north	degrees
P35	Hillshade	HILL	Mean relative illumination of terrain surface	X

Note

Static features include attributes derived from reservoir polygons, catchment boundaries, and global datasets. While land cover can change over time, relative proportions are considered stable for modeling purposes. Dynamic changes in land use or sedimentation are described in dynamic variables, though are calculated within static features in reclaim.