LR706 East African Flood Model_ Fiddes - Transport for Development
LR706 East African Flood Model_ Fiddes - Transport for Development
LR706 East African Flood Model_ Fiddes - Transport for Development
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Using rainfall maps inref(11),<br />
2 yr daily point rainfall = 63 mm<br />
10:2 yr ratio = 1.49<br />
10 yr daily point rainfa~ = 94 mm<br />
1.15 24.33 0.96<br />
R1.15 = ~ (m) . 94 = 59.Omm<br />
Area reduction<br />
factor is given by<br />
ARF = 1 – 0.04 T-3 A; = 0.88<br />
Average rainfall (P) = 59.0x 0.88 = 51.9 mm<br />
RO=CA. (P–~. A. 103<br />
Q= 0.93 . RO = 26.23 m3 /see<br />
3600 . TB<br />
TA = 0.028 L — = 0.29 hrs<br />
~;~;<br />
TB (2nd approximation) = 1.15 + 0.29 = 1.44 hrs<br />
1.44 ~24.33)0.96 ..94 = 69.9 mm<br />
R1.44 = ~ — 1.77<br />
ARF = 0.89<br />
There<strong>for</strong>e,<br />
P = 62.4 mm<br />
Q<br />
= 25.11 m3/sec<br />
TA<br />
= 0.29 hrs (no change)<br />
There<strong>for</strong>e, Q = F . 0<br />
F = 2.8<br />
There<strong>for</strong>e, Q = 2.8 . 25.11<br />
= 70.3 m3 /see<br />
25
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