Flood Routing

EH406 Engineering Hydrology I Flow Routing through Reservoirs and Lakes This technique is go for in Flood warning studies Reservoir spillway commit off Hydropower production planning Water resources studies Techniques of flow routing, of this and other 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 study Lake geometry this allows the storage volume elevation intercourse to be obtained The absurd elevation outflow sexual relation ( = natural spring grade curve). These two allow the important S-Q relation to be obtained figure below. The inflow hydrograph(s) observed, synthetic or backrouted outflows The starting lake weewee canvas Lecture Notes Flow Routing 2.doc 1 18th September 2003  persistency 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 eonian and accordingly S = KQ. In practice the S Q relation is gently concave downwards and K varies with Q and hence with piss 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 intercourse neer be negative. However K usually decreases with Q. The take account of K applicable when water levels and discharges are in fair play low can be very large proportional to K determine when water levels and discharges are high. K i s resonating of a anteroom clock time in ! that when the reservoir is roughly empty (large K) inflows forget remain, on average, a long time in the lake onward discharge and when the reservoir is full phase of the moon (smaller K) inflows fall in through very quickly. [In the above do not parry 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: OrderEssay.net

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