1. Absolute mox.precip. Centemporaneous occ. Precip.in inch
Time of
Line Zone or
Station obser- Duration in hours Time in hours at end of period
Zone Center
vation
6 12 18 24 30 36
6 12 18 24
9A1 3P1 9P1 3A2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23

2. Effective Area Product of Accu. Start Rainfall x
Encompassing Isohyet Controlled by Station wt. Except as otherwise note
Station
Line Center Plani Yime in hour at end of period(or
Station or Item Description Average Area Station Duration of Max. Precipitation)
no or Zone meter
Inches P in Inclosed Weight
Reading 6 12 18 24
inches sq.mi. in %
K = 1534
9A1 3P1 9P1 3A2

3. Duration of rainfall in hours
Area in sq.mi.
6 12 18 24 30 36 48 60 72 96 120
10
100
200
500
1000
2000
5000
10000
20000