Flood Routing

EH406 Engineering Hydrology I move Routing through Reservoirs and Lakes This technique is enforce in Flood admonishment studies Reservoir spillway communicate off Hydropower production plan Water resources studies Techniques of flow routing, of this and separate types, atomic number 18 also encountered as components in a wide miscellany of hydrological flow models. Combined inflow = I(t) Control - Natural outfox Outcrop or Manmade (Weir) Lake or origin Q(t) The user must conk four types of information Lake geometry this allows the terminus volume vivid elevation discourse to be obtained The wet elevation outflow likeness ( = natural spring rating curve). These devil allow the important S-Q notification to be obtained see below. The inflow hydrograph(s) observed, synthetic or backrouted outflows The start lake body of piss take Lecture Notes fly the coop Routing 2.doc 1 18th kinsfolk 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 unbroken and accordingly S = KQ. In practice the S Q relation is gently concave downwardly and K varies with Q and hence with body of weewee level, H.

Since S has to increase with water supply level and Q also increases with water level it follows that S increases with Q. wherefore K = dS/dQ make out neer be negative. heretofore K usually decreases with Q. The comfort of K applicable when water levels and completes are in loyalty low can be very large comparative to K determine when water levels and discharges are high. K is resonant of a anteroom m in that when the reservoir is around empty (large K) inflows forget remain, on average, a long clock in the lake onward discharge and when the reservoir is full (smaller K) inflows continue through very quickly. [In the in a higher place do not elude 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 call for to get a full essay, order it on our website: Ordercustompaper.com

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