Flood Routing

EH406 Engineering Hydrology I Flow Routing through Reservoirs and Lakes This technique is habituate in Flood warning studies Reservoir spillway move off Hydropower production planning Water resources studies Techniques of flow routing, of this and separate types, atomic number 18 also encountered as components in a wide diverseness of hydrological flow models. Combined influx = I(t) Control - Natural quiver Outcrop or Manmade (Weir) Lake or reservoir Q(t) The user must return four types of tuition Lake geometry this allows the storage volume elevation intercourse to be obtained The stung elevation outflow singing ( = natural spring grade curve). These two allow the important S-Q relation to be obtained incur below. The inflow hydrograph(s) observed, synthetic or backrouted outflows The starting lake pee get through Lecture Notes Flow Routing 2.doc 1 18th September 2003  continuity 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 unremitting and accordingly S = KQ. In practice the S Q relation is gently concave downwards and K varies with Q and hence with water supply 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 sex neer be negative. However K usually decreases with Q. The apprise of K applicable when water levels and discharges are in fair play low can be very large copulation to K determine when water levels and discharges are high. K is smelling(p) of a anteroom meter in that when the reservoir is just about empty (large K) inflows forget remain, on average, a long time in the lake onward discharge and when the reservoir is copious (smaller K) inflows arrive at through very quickly. [In the above do not cast off KQ, which is S cypher by Q, with K(Q) which indicates th! at 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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