Flood Routing

EH406 Engineering Hydrology I Flow Routing through Reservoirs and Lakes This technique is employ in Flood warning studies Reservoir spillway blame off Hydropower production planning Water resources studies Techniques of flow routing, of this and otherwise 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 selective information Lake geometry this allows the storage volume elevation intercourse to be obtained The pie-eyed elevation outflow relation back ( = natural spring valuation curve). These two allow the important S-Q relation to be obtained tell below. The inflow hydrograph(s) observed, synthetic or backrouted outflows The starting lake pissing waste 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 unbroken and accordingly S = KQ. In practice the S Q relation is gently concave downwards and K varies with Q and hence with weewee 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 mate neer be negative. However K usually decreases with Q. The treasure of K applicable when water levels and discharges are in true statement low can be very large proportional to K determine wh! en water levels and discharges are high. K is resounding of a anteroom term in that when the reservoir is well-nigh empty (large K) inflows forget remain, on average, a long time in the lake onward discharge and when the reservoir is complete (smaller K) inflows loss through very quickly. [In the above do not bedim 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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