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limit the amount of uaLeV WlCasud to streams .acrd sUnIM Qwin sysLons., <br /> DatenLion does not ptcvanL the qoant!Ly of MnOrf from inurunsing dui: <br /> to urbanization, j, laws the rowase of this runoff, generally b.y <br /> constricLing the flow of waLej at Some point in thu drainage syst= <br /> ti <br /> 1. DcLcntion of runofT reduces the pwak MY of water- "S in tiro <br /> Volume of water vOich paWSYS through a given rcach Of Stream in One unit Of <br /> time- TL can, and does extend the 3ifn of older dcwnsCrQan draipagn Encili- <br /> tics (in, bridges and culverts) Voich have to In pariosically replaced Ou <br /> to increasing MUOff levels caused by uIhnniZation. <br /> 2. Flooding is a form of detention, caused by uater in excess ur rhc% <br /> RF.Iount that can be handled by the siarm drain aystcm- Therefore. detention <br /> is flooding by design, rather than by chance. As such it can PYOWO Some <br /> frr,C,,tion from fjoading to areas j,,ndjntujy anwastycam from the detnnJoll <br /> structure, at the cost of temporarily flooding a WsAgnnted "psLraan aree.- <br />