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District for storage in Platoro Reservoir. The rules that have been defined in the Rio Grande <br />model (Rule Type 16) allow specific ditches to store and release water subject to certain <br />constraints (see memorandum documenting development of the reservoir model input files). <br />Split River Channels <br />Several rivers in Division 3 that are explicitly represented in the Rio Grande surface water model <br />naturally split into two distinct channels along their courses, with the two channels then re joining <br />at a point down stream. Included are the Rio Grande (near Monte Vista), the Conejos River (near <br />Highway 287), and the Rio San Antonio (near Ortiz). The points of divergence for the different <br />channels have been identified as SBRG-OUT (south branch Rio Grande), NBCON-OUT (north <br />branch Conejos River), and SBRSA-OUT (south branch Rio San Antonio). <br />In split river situations, diversion structures exist on both river channels, and therefore, both <br />channels must be represented in the surface water model. This is accomplished in the StateMod <br />modeling system using carrier-type operating rules to carry water from one channel to another <br />(Rule Type 11). The administrative priorities given to these operating rules are identical to those <br />of the original direct flow water rights. Separate operating rules are required for each individual <br />water right associated with each diversion structure on the split channel. Note that use of these <br />rules implies that the amount of water flowing down each river channel is controllable for water <br />rights administration purposes. There are currently 57 rules (Rule Type 11) in the Rio Grande <br />model to represent split river channel situations. <br />Rule Type Description <br />11 Direct flow demand thru intervening structures <br />Carrier operating rules used in Phase la modeling efforts to represent split river channels <br />are shown in Table 13 (Attachment 3). <br />Carrier Structures <br />Carrier-type rules are also used in the Rio Grande surface water model to represent situations <br />where water is diverted by a ditch from one source into another river, then re-diverted by another <br />ditch. For example, this situation occurs in District 21 (transfers from Alamosa River to La Jara <br />Creek), District 24 (Cerro Dam and Acequia Madre), and District 25 (Werner Arroyo). The <br />operating rules specified in the surface water model effectively carry water from the original <br />source directly to the final point of diversion. Carriers are also used to carry water from rivers to <br />reservoirs District 24 (Costilla and Culebra rivers to Eastdale Reservoir and Culebra-Sanchez <br />Canal to Sanchez Reservoir). <br />Rule Type 14 is also used to impose volumetric limits on the amount of water which may be <br />carried. This rule was applied to water carried to Eastdale Reservoir from the Costilla River. <br />Rule Type Description <br />11 Direct flow demand thru intervening structures <br />14 Similar to No. 11 but diversions are constrained by demand at carrier structure <br />The administrative priority given to these operating rules are typically the same as the for direct <br />flow rights under which they divert. In some instances (e.g. Empire Canal), operating rules are <br />specified for the original structure (Empire Canal -Rio Grande) as well as for the destination of <br />C:Acdss\Task6-l0.doc Prepare Operating Criteria File February 24, 2000 -Page 3 of 5 <br />