EESA07H3 Lecture Notes - Lecture 8: Water Use, Sewage Treatment, Stormwater
16 Nov 2016
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Eesa07h3 f: lecture 8 - humans and aquatic ecosystems: finding the right balance & Define the major human modifications to aquatic ecosystems. Define solution techniques for urban stream syndrome . Dams and reservoirs: aging of continental runoff. Water has a high residence time while in a reservoir due to an interruption of the hydrologic cycle. Dams and streamflows: flood control dams, hydropower dams. Leads to altered runoff patterns and the siltation of waterbodies. Ecosystem destruction leads to a loss of wildlife. Loss of a natural source for water filtration. Range of different flows: magnitude, timing, duration, frequency, rate of change and predictability. There must be a range of flows. Restoring flows can help to restore the entire ecosystem. Due to human uses of water we can"t completely restore natural flow regime. Perfect balance: ecosystem health versus human use. Human alterations to river channels: straightening, deepening, widening, riverbank hardening, concrete channel installation etc.
