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CE-235 EH Lec 3
1.
NUST Institute of
Civil Engineering/Engr Sajjad Ahmad 1
2.
3.
Factors influencing precipitation
formation
4.
Precipitation classification based
on lifting mechanism
5.
Measurement of precipitation
6.
7.
8.
9.
10.
11.
X-axis ≈ Average
accumulated precipitation of nearby stations
12.
Y-axis ≈ Accumulated
precipitation of the station under consideration
13.
14.
Determine cumulative rain
fall of the subjected station and of the nearby stations
15.
Draw double mass
curve
16.
Part of the
curve which lies in straight line requires no correction
17.
18.
To determine correction
factor calculate the slope of the curve before and after the point of deviation
19.
20.
Po =Observed precipitation
21.
Sa =Slope prior
to the break in the curve
22.
So =Slope after
the break in the curve
23.
24.
NUST Institute of
Civil Engineering/Engr Sajjad Ahmad16
25.
26.
27.
Consistency of the
record at station ‘A’
28.
Indicate the year
in which there is a regime changes
29.
NUST Institute of
Civil Engineering/Engr Sajjad Ahmad25
30.
NUST Institute of
Civil Engineering/Engr Sajjad Ahmad 26
31.
32.
Draw curve of
cumulative rainfall
33.
Determine point of
deviation
34.
Calculate slope before
and after deviation
35.
Apply correction to
the points lying after the deviation
36.
37.
Thiessen Polygon Method
38.
Distance weighting
39.
Isohyetal Method
40.
41.
If P1, P2,
P3, … Pn etc are the precipitation or rainfall values measured at ‘n’ gauge stations, then
42.
43.
Find average precipitation
44.
45.
It is also
called Weighted Mean Method
46.
47.
Connect all gauging
stations
48.
49.
50.
Calculate average precipitation
51.
52.
53.
An isohyetal map
shows contours of equal rainfall on the ground
54.
Gives more accurate
picture of rainfall distribution
55.
56.
Indicate points of
rain gauges
57.
Write rainfall value
at gauge points
58.
Draw isohyets
59.
Measure area enclosed
or b/w every two isohyets
60.
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