Flood Routing

EH406 Engineering Hydrology I Flow Routing through Reservoirs and Lakes This technique is implement in Flood warning studies Reservoir spillway address off Hydropower production planning Water resources studies Techniques of flow routing, of this and new(prenominal) types, atomic number 18 also encountered as components in a wide diverseness of hydrological flow models. Combined inflow = I(t) Control - Natural quiver Outcrop or Manmade (Weir) Lake or reservoir Q(t) The user must return four types of learning Lake geometry this allows the storage volume elevation intercourse to be obtained The plastered elevation outflow likeness ( = natural spring place curve). These two allow the important S-Q relation to be obtained design below. The inflow hydrograph(s) observed, synthetic or backrouted outflows The starting lake irrigate rail Lecture Notes Flow Routing 2.doc 1 18th September 2003  perseverance Equation I (t ) ? Q(t ) = Q(t ) + K (Q) dQ dS dS dQ = = K (Q) dt dt dQ dt (1a) dQ = I (t ) dt (1b) where K(Q) is the slope of the S Q relation, K (Q) = dS dQ (1c) In a linear reservoir K is a invariable and accordingly S = KQ. In practice the S Q relation is gently concave downwards and K varies with Q and hence with irrigate level, H.

Since S has to increase with water level and Q also increases with water level it follows that S increases with Q. Hence K = dS/dQ have a go at it neer be negative. However K usually decreases with Q. The observe of K applicable when water levels and discharges are in uprightness low ca n be very large relational to K determine ! when water levels and discharges are high. K is reverberating of a anteroom clip in that when the reservoir is most empty (large K) inflows forget remain, on average, a long time in the lake onward discharge and when the reservoir is all-encompassing (smaller K) inflows sink through very quickly. [In the above do not blot out KQ, which is S cypher by Q, with K(Q) which indicates that K depends on i.e. is a function of Q]. natural S-Q relation...If you want to get a full essay, order it on our website: OrderCustomPaper.com

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