CRWR Online Report 97-7
GIS Based Reservoir Planning for the Souss Basin, Morocco
By Kwabena Asante and David R. Maidment
ABSTRACT
This research was undertaken to develop a map-based
surface water simulation model of a river basin, incorporating the operation
of reservoirs. The Souss River in Morocco and the three major reservoirs
located within the basin were used as the study case in the research which
focused on simulating the effects of reservoirs on flow in the basin. A
surface water simulation program developed at the University of Texas at
Austin was customized to enable it to simulate the operation of reservoirs
with variable monthly demands. The program was developed in the object-oriented
programming language, Avenue, of the GIS software ArcView. Rainfall data
from 48 rain gages stations spanning a 60 year period from 1935 to 1995
were processed into daily and monthly time series. Flow time series were
also generated from runoff data collected at 6 gauging stations in the
basin. Historical operation data from each of the three Souss reservoirs
were also processed into time series and incorporated into the simulation
to enable basin response to be predicted accurately. The effects of temporal
scale on modeling effort and results were also explored by performing daily
and monthly simulations. An ArcView extension called DAMS was constructed
to enable the user to insert and remove dams as required. The extension
includes preprocessing programs for creating reservoir operation and regulation
tables, varying monthly water allocations and setting initial reservoir
storage. It also contains a postprocessor for generating a summary of performance
of the reservoirs during the simulation period. The reservoir simulation
was successfully completed and recorded storage levels were successfully
reproduced using inflow data recorded in the reservoir operation tables.
However, reservoir inflows generated by the surface water simulation model
did not closely resemble those recorded in the operation tables, particularly
during periods of highly variable flow.
CRWR Online Report 97-7
GIS Based Reservoir Planning for the Souss Basin, Morocco
By Kwabena Asante and David R. Maidment
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1997 Center for Research in Water Resources.
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