Abstract:
System  analysis  models  have  been  categorized  as  simulation,  optimization and  hybrid  models  (combination  of  simulation  and  optimization  models).  A simulation  model  is  a  representation  of  a  system  that  is  used  to  predict  its behavior  under  given  set  of  conditions.  Development  and  application  of decision  support  tools  have  focused  on  simulation  models.  Simulation  has  been considered  as  an  important  tool  for  practical  applications. 
Recognizing  the  utility  of  simulation  models  in  analyzing  the  performance of  complex  water  systems  and  in  developing  their  operation  procedures,  two simulation  models  have  been  developed  in  the  National  Institute  of  Hydrology (N.I.H),   Roorkee.   First  model [Software  for  Reservoir  Analysis (SRA)] pertains  to  the  simulation  of  a  multi-purpose  multi-reservoir  system  for conservation  and  flood  control  purposes  while  the  second  model  [Simulation of  Integrated  Network  of  CHAnnels  for  Irrigation  (SINCHAI)]  simulates  the operation  of  a  canal  system  and  can  be  used  for  real-time  operation  of  canals in  irrigation  commands.  This  paper  presents  a  brief  description  of  these models.