Current representation of the Ouème basin in WEAP: basin boundary

-basin truncated at Bonou, as agreed upon by Rivertwin consortium

Current representation of the Ouème basin in WEAP: Sub-basins

-basin divided into 15 sub-basins defined for Rivertwin project (within version truncated at Bonou)

Current representation of the Ouème basin in WEAP: Sub-basins•each sub basin is represented by:

–one catchment node (for hydrology modeling)–one domestic/industrial demand node–one agriculture demand node–one groundwater node

Current representation of the Ouème basin in WEAP: full schematic

Current representation of the Ouème basin in WEAP: domestic/industrial demand

•one domestic/industrial demand node per sub-basin•village populations aggregated by sub-basin•Simple water use rate (10 m3/person) obtained from “World’s Water”

Demand = sub-basin population x water use rate

Current representation of the Ouème basin in WEAP: agriculture demand

•one agriculture demand node per sub-basin•demand represented on a per capita basis•simple water use rate (30 m3/person) obtained from “World’s Water”

Demand = sub-basin population x water use rate

Current Current Ouème Data StructureData Structure

What additional data do we need, what is available, and from where?

•Domestic/Industrial Demand on a per-capita basis for each sub-basin

•Agricultural Demand on a per-capita basis for each sub-basin

•4 GRDC Gauging Station data

Estimates based on World Water values

Data needed to advance the WEAP model of the Ouème basin

• basin-wide land use maps (to allow land use-driven hydrologic modeling)

Smax

Rd z1

Interflow = f(z1,ks, 1-f)

Percolation = f(z1,ks,f)

Baseflow = f(z2,drainage_rate)

Et= f(z1,kc, , PET)

Pe = f(P, Snow Accum, Melt rate)

Plant Canopy

P

z2

L

u

Data needed to advance the WEAP model of the Ouème basin

• historical climate data (precip, wind, temp, humidity) for each sub-basin to model runoff, baseflow, ET.

Data needed to advance the WEAP model of the Ouème basin

•streamflow data from the Rivertwin gauges (to allow calibration of the model at various points in the basin). Presently, only have GRDC gauge data (1948-1992)

Data needed to advance the WEAP model of the Ouème basin

• basin-wide land use maps • historical climate data• streamflow data from the Rivertwin gauges •groundwater use (volumes used by sector, preferably at the sub-basin level) – presently have locations of wells at village level• domestic/industrial water use rates, with any sub-basin level and intra-annual variations• irrigation water use by crop, with patterns of monthly variation and proportion coming from groundwater versus surface water

Data

• basin-wide land use maps (Rivertwin Database)• historical climate data (CD)• streamflow data from the Rivertwin gauges (Exist, accessible)•groundwater use (volumes used by sector, preferably at the sub-basin level) – presently have locations of wells at village level (• domestic/industrial water use rates, with any sub-basin level and intra-annual variations• irrigation water use by crop, with patterns of monthly variation and proportion coming from groundwater versus surface water