

I I I 

 ~ i * 



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 IJC apportionment recommendation entitles Montana to an on- 

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

 Jime 1. Based on the runoff volume of 31,740 dam^ (25,730 acre-feet) recorded at the Poplar River at 

 hitemational Boundary gauging station during the March 1 to May 31, 1999 period, Montana was 

 entitled to an additional release of 1,230 dam^ (1,000 acre-feet) from Cookson Reservoir during the 

 succeeding twelve-month period commencing June 1, 1999. Montana requested this release to be made 

 between May 1 and May 31, 2000. A volume of 1,180 dam^ (957 acre- feet), in addition to the mini- 

 mum flow, was delivered dxiring 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 



