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lx = a *P1 /(10 +Tc)^b <br />where - <br />Point intensity values - <br />I- 2YR(5MIN) = <br />I- 2YR(10MIN) = <br />I- 2YR(15MIN) = <br />I- 100YR(5MIN) = <br />I- 100YR(10MIN) = <br />I- 100YR(15MIN) = <br />lx - intensity at time interval <br />P1 - point rainfall for 1 hour <br />Tc - time of concentration <br />a - coefficient (from NOAA criteria = 28.9) <br />b - coefficient (from NOAA criteria = 0.786) <br />28.9 *0.603/(10 +5) ^0.786 = <br />28.9 *0.603/(10 +10) ^0.786 = <br />28.9 *0.603/(10 +15) ^0.786 = <br />28.9 * 1.418/(10 +5) ^0.786 <br />28.9 * 1.418/(10 +10) ^0.786 <br />28.9* 1.418/(10 +15) ^0.786 <br />2.0739937 <br />1.6542669 <br />1.3881433 <br />4.8771526 <br />3.8901334 <br />3.2643238 <br />