Homework Help Forum: Environmental science

Posted by Easha on Tuesday, October 27, 2009 at 9:01pm.

Llyn y Gweision (a Welsh lake) has a surface area of 10 km2. It is fed by two rivers: the Afon Chwefru and the Nant Aeron. The Chwefru(Ich) has a catchment area of 1250 km2. The Aeron(Iae) has a catchment area of 2.400 * 106 ha. The outflow stream, the Afon Rhondda (Orh) has an average annual flow rate of 1367.6 ft3 s-1 (c.f.s). Rainfall in the region is 40.0 inches y-1, and annual evaporation from the lake surface is 8.10 * 106 m3.The equilibrium amount of water stored in the lake is 0.550 km3. Of the total amount of rainfall over the Chwefru basin, 32.0% leaves the basin as streamflow. For the Aeron basin, the annual streamflow amounts to an equivalent water depth of 33.87 mm over the whole basin. Show that for the above inputs and outputs that S = 0. If 10% of the flow from the Chwefru is diverted for municipal water supply, how much will lake level fall in one year; all else staying the same? A friendly (continuity) equation might be: (I(Chwefru)+ I(Nant Aeron) + I(precipitation in lake) ) - (0(Rhonnda) + O(evaporation). ) = SL where Ii = Inputs, Oi = Outputs and S = change in storage.

• Environmental science - Easha, Wednesday, October 28, 2009 at 3:07pm

  no need for any answer..ty..i solved it...but i dont no if its right or wrong..but i'll go with it anyways..:)

  
  

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