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,;':.,,' ',,!:'. Inadvertent Diversion ~< ',;.,' ;-'-' i..".. iJaa252 t':.:- ~\i,,~ ;;:'. ~'" :. !~:. , 'r';',. ;.:'-:~t.' i ';i>' " ::;~-, , .. .An increase in head.in the stream, whatever the cause, results in a head increase at a streamflow diversion structure. Consequently, a ditch may divert a quantity of water greater than that which waS intended; the additional quantity of diverted water is termed inadvertent diversion. Inadvertent diversion was not considered to be a transit loss for the .transportation of transmountain return flows down Fountain Creek. All appropriations of su~face water in Fountain Creek within the study area are based on native streamflow. With prope.r.administration of appropriated water rights in the study area within the priority system as established by Colorado water law, transmountain return flows should not sustain losses from diversion, inadvertently or otherwise. ';". Ground-Water Withdrawal . The numerous wells completed in the alluvium along Fountain Creek withdraw considerable quantities of water. Most recharge of the alluvium is from streamflow in Fountain Creek (Edelmann and Cain, 1985, p. 29), and since transmountain return flow is a component of streamflow, transmountain return flow potentially is subject to ground-water-withdrawal losses. . t,' \, ",( : "; Ground-water withdrawal, however, was not considered to be a transit loss for the present s.tudy. Appropriations of ground water within the study area also have been made on the basis of native water. Therefore, water withdrawn from the Fountain Valley alluvium should, under Colorado water law, be derived from native water sources, :.... .. : .... :,:." ~:.:.:~ STREAMFLOW-ROUTING MODEL :~~'~(/ ..:.::";." ~';: "'~'. The J349 model (Land, 1977) selected for this study has two basic components, a streamflow-routing component and a bank-storage-discharge component; the streamflow-routing component determines channel storage. A detailed description of the model is beyond the ~cope of this report; the model documentation (Land, 1977) and the. reference's cited therein provide ample discussion of theory of operation. The model used in this study recently has been applied in the determination of transit losses on several streams in southeastern Kansas (Carswell and Hart, 1985; Jordan and Hart, 1985). Also, a similar model was used to determine.transit losses along the Arkansas River in Colorado (Livingston, 1973, 1978). All of these studies determined transit losses assoeiated with reservoir releases. .,,". I F~': I '.," I System of Nodes and Sub reaches For use of the model, a stream reach to be studied is divided into one or more subreachesj the end points of the subreaches are referred to as nodes. For determination of transit losses associated with transmountain return 14 .-1; .,