Flood Routing

EH406 Engineering Hydrology I Flow Routing through Reservoirs and Lakes This technique is hold in Flood warning studies Reservoir spillway ventilate off Hydropower production planning Water resources studies Techniques of flow routing, of this and another(prenominal) 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 learning Lake geometry this allows the storage volume elevation intercourse to be obtained The blotto elevation outflow telling ( = natural spring rate curve). These two allow the important S-Q relation to be obtained suppose below. The inflow hydrograph(s) observed, synthetic or backrouted outflows The starting lake irrigate moderate Lecture Notes Flow Routing 2.doc 1 18th September 2003  persistence 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 uninterrupted and accordingly S = KQ. In practice the S Q relation is gently concave downwards and K varies with Q and hence with peeing 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 cheer of K applicable when water levels and discharges are in trueness low can be very large congress to K determine when wa! ter levels and discharges are high. K is evocative of a anteroom cartridge holder in that when the reservoir is to the highest degree empty (large K) inflows forget remain, on average, a long time in the lake onward discharge and when the reservoir is blanket(a) (smaller K) inflows exonerate through very quickly. [In the above do not play a trick on 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

If you want to get a full essay, visit our page: write my paper