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1824 Ex~anges Four different exchange operations are anticipated in operation of the FLWB, The first type of exchange, called a Type 1 Exchange and illustrated in Figure 7.3, consists of an internal "contract" exchange in Adobe Creek Reservoir, If the participating shareholder's portion of the FLCC's call at the main headgate were less than the deferred diversion required to satisfy the water bank requirements, then the difference between the two would be transferred from the water bank storage account to the FLCC storage account in Adobe Creek Reservoir. Loss in the main canal would be approximately equal to any loss in the storage canal through which the water bank water would be delivered to Adobe Creek Reservoir thereby offsetting any loss assessment on the water. The second type of exchange, called a Type 2 Exchange and shown in Figure 7.4, occurs if the participating shareholders portion of the FLCC's call at the main headgate is greater than the deferred diversion. The difference between the call and the deferred diversion, minus a 17% transit loss assessment would be transferred from the FLCC storage account to the water bank in Adobe Creek Reservoir. A Type 3 Exchange consists of an internal contract exchange and is shown in Figure 7.5, When a deferred diversion from the storage canal has been used to meet the requirements of the water bank, the amount of deferred diversion would be transferred from the water bank account to the FLCC storage account in Adobe Creek Reservoir, A Type 4 Exchange, displayed in Figure 7.6, would move water from Adobe Creek Reservoir to Pueblo Reservoir during the winter water diversion season. Water bank water would be exchanged for water in storage in Pueblo Reservoir by diverting FLCC water destined for Adobe Creek Reservoir into space in Pueblo Reservoir which would be under contract to the water bank, This exchange would complete the cycle of water movement for the annual period and would prepare the water bank accounts for the next water bank season. In summary, Type 1 and 2 Exchanges are considered summer exchanges and are executed to compensate for the variability of FLCC divertabIe flow vs. FLWB requirement in the river. Type 3 and 4 Exchanges are winter exchanges and take advantage of the more predictable flow in the river, Physical Constraints and Protection of Non-Participating Shareholders Several physical characteristics of the river system and the FLCC system must be accounted for in the operational analysis of the water bank, First, monitoring and operational adjustments at the FLCC main headgate are major considerations. The FLCC superintendent estimates that the diversion rate can be controlled within 3 cfs under current conditions (Smith, 1993), This level of control is considered acceptable for measurement of deferred diversions. The headgate structure is the major hydraulic control facility in the local reach of the river, Additionally, constraints must 7-19