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I I I I I I I I I I I I I I I I I I I Debits In the case of Colorado, yearly or accumulated debit departures of as much as 100,000 af from the Compact obligations are allowable for any reason. An additional Compact provision allows the debit to accumulate to over 100,000 af provided that the accumulated debit greater than 100,000 is held in storage. However, Colorado is not to increase storage of post-compact water rights when Rio Grande Project Storage has less than 400,000 af of usable water in storage. If average annual Rio Grande Proj ect releases exceed 790,000 af, then the 400,000 af value would be adjusted downward according to Article 7 of the Rio Grande Compact. Debit water can be held in post-1937 reservoirs in Colorado subject to the condition that releases of that water may be requested to maintain contents in Rio Grande Project Storage of 600,000 af between March 1 and April 30. A portion of the water withheld upstream in a "debit" account can be removed from the debit account if it is demonstrated that the water would have caused a spill if released to Rio Grande Project Storage. In any year in which there is an actual spill of usable water at Rio Grande Project Storage, accrued debits of Colorado at the beginning of the year will be cancelled. Credits Deliveries of water by Colorado in excess of the Compact obligation create a credit which can be generally used to reduce Colorado accumulated debits or, in the absence of an accumulated debit, can accumulate as credits. The following provisions affect the accumulation of Colorado's credits: annual credits are limited to 150,000 acre-feet. accrued credits are subj ect to reduction by evaporation calculated as a proportional share of evaporation incurred on Rio Grande Project Storage. accrued credits will be reduced by the amount of a spill at Rio Grande Project Storage. 30