Point rainfalls due to a storm at several rain-gauge stations in a basin are shown in Fig. 3.16. Determinethe mean areal depth of rainfall over the basin.8 cm6 cmArea(km')410zone8 cm900zana VIN (9.2)28501750720550IIIVO (7.4 cmD (9.2VA (8.6)(8.5)L (5.2)VIH (5)E (138)(5.6)K (7.8Area of the Basin = 7180 kmB (7F (10.4I (11.2)J (9.010 omzoneFigure 3.16 Isohyetal Map

mean depth is given byPm=P0+P12A1+P1+P22A2+P2+P32A3+P3+P42A4+P4+P52A5+P5+P62A6A1+A2+A3+A4+A5+A6here…

Point rainfalls due to a storm at several rain-gauge stations in a basin are shown in Fig. 3.16. Determine the mean areal depth of rainfall over the basin. Area(km") zone 410 900 2850 1750 720 550 N(92) III O 04 cm D (92 IV A (86) a.5) L (52) VI 56) Area of the Basin - 7180 km E (1) K (7 F (10.4 I (1.2) 10 om Figure 3.16 Isohyetal Map

Point rainfalls due to a storm at several rain-gauge stations in a basin are shown in Fig. 3.16. Determine the mean areal depth of rainfall over the basin. Area(km") zone 410 900 2850 1750 720 550 N(92) III O 04 cm D (92 IV A (86) a.5) L (52) VI 56) Area of the Basin - 7180 km E (1) K (7 F (10.4 I (1.2) 10 om Figure 3.16 Isohyetal Map

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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There is 10 rain gauge stations in a catchment. The annual rainfalls recorded by the gauges are the following: 102.3cm, 181.12cm 123.4cm, 43.5cm, 112.23cm, 88.89cm, 75.5cm, 69.69cm, 97.87cm, 111.11cm. For an 8% error in the estimation of mean rainfall, calculate the optimum number of stations in the catchment.
A square island have 3 installed rainfall station on each of the corner with these records: A=1500mm, B=1800mm, and C=2500mm. What is the estimated point rainfall in mm in between A and B, wherein both lies on the same edge of the island? WRONG ANSWER 1650!!!
The annual rainfall at the rain-gauge stations with the catchment area of 10km are indicated below. Thiessen polygon measured are also shown in the table below. Stations Recorded rainfall(P1)(cm) Area of polygon(ai)(km2) A 8.8 570 B 7.6 920 C 10.8 720 D 9.2 620 E 13.8 520 F 10.4 550 G 8.5 400 H 10.5 650 I 11.2 500 J 9.5 350 K 7.8 520 L 5.2 250 M 5.6 350 1. Describe mean rainfall over the area using Thiessen polygon method and Compare Thiessen polygon method with arithmetic mean method.
A small urbanized area having smooth bare packed soil is to be drained by means of storm sewer system. The distance from the most remote point on the boundary to the upstream manhole is 200 m. For a 50- minute storm with an effective rainfall intensity of 70 mm/hr, So is 0.005 and n=0.016. Determine the time of concentration using;a) Kinematic wave equationb) NRSC methodc) Kirpich equationd) Izzard equatione) Kerby equation
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