10 



0.1 



0.01 



>■>•>• c c -s rs ooia.Q.tjti 5 



«• '« s s 





•k 6 <i>. 





<^ T- CM »- CM 



1999 



Figure 3.2 Flow Hydrograph of the East Poplar River at International Boundary. 



3.2.4 On-Demand Release 



In addition to the minimum flow, the I JC apportionment recommendation entitles Montana to an on- 

 demand release to be delivered on the East Poplar River during the twelve-month period commencing 

 June 1 . Based on the runoff volume of 4,420 dam^ (3,580 acre-feet) recorded at the Poplar River at 

 International Boundary gauging station during the March 1 to May 31.1 998 period, Montana was 

 entitled to an additional release of 370 dam^ (300 acre-feet) from Cookson Reservoir during the 

 succeeding twelve month period commencing June 1 , 1 998. Montana requested this release to be made 

 between May 1 and May 31, 1999. A volume of 1,220 dam^ (989 acre-feet), in addition to the 

 minimum flow, was delivered during this period. A hydrograph showing cumulative volume of the on- 

 demand release request and on-demand release delivery made at the East Poplar River at International 

 Boundary is shown in Figure 3.3. 



