- I An Urban Cotchment Has Ditch Shown Below Paths From Remote Points Of The Main Ditch Are Also Indicated The Detail Of 1 (200.28 KiB) Viewed 45 times
i. An urban cotchment has ditch shown below Paths from remote points of the main ditch are also indicated. The detail of each Subarea are listed in the table below. Overland travel time as well as travel time in Bush The ditch are computed by Kirpich formule, which is & given by : to 0.019% Ľ.77 $9.385 kthere to is the time of concentration in minutes, I in meter, and S- Slope of landd 10 E 4358 If the 25 years intensity is given by itt 725 0.3, whore i is the rainfall intensity in and to Determine the floor discharge by at point G by: i. Rational method Conservation ". The Natural Resource Cer Service (NRCS) Cunce number method as assuming average Antecedent Runoff condition (ARC) and rainfall duration equal to duration obtain in the Rational method above. ii. The Natural Resource Conservation Service (NRCS) Carve number assuming it had been raining intensity for the past three days. IV. Comment on the results obtained by the Rational method and that of the NRCS method Drainage Type of Suface Average soil infiltration Area Area (Km²) irate (mm/h) Path Length] Slope / \ 1 Bare Surfall 0-04882 8 1 AB 800 1.5 0.05492 Asphalt Paved C=0·8 2 5 BD 600 1.0 CD 432.8 2.0 3. 0.04800 8.5 ED 548.6 Law, fair Condition C=0.3 Concrete Pared C=0.9 1.5 10.05736 1 700 1.5 800 0.8 4. DG FG