Input element 7. Withdrawal element Headwater elements begin every tributary as well as the main river system, and as such, they must always be the first element in a headwater reach. A standard element is one that does not qualify as one of the remaining six element types. Because incremental flow is permitted in all element types, the only input permitted in a standard element is incremental flow. A type 3 element is used to designate an element on the main stem just upstream of a junction.
River reaches which are aggregates of computational elements are the basis of most data input.
Hydraulic data, reaction rate coefficients, initial conditions, and incremental flows data are constant for all computational elements within a reach . All rights reserved.