Problem

Deal with a hypothetical watershed with the following parameters.Require actual HEC-HMS pr...

Deal with a hypothetical watershed with the following parameters.Require actual HEC-HMS program computations.

Subbasin Number	Area (ac)	L (ft)	Lca (ft)	S (ft/mi)	Development (%)	Conveyance (%)
1	1280	7000	4000	20	30	80
2	1485	9000	5050	20	28	80
3	2045	8750	4975	10	70	100
4	1517	8230	41 1 5	10	70	100
5	2752	10,000	6340	10	75	100

Assume S = S0 in each subbasin. The infiltration data are as follows:

Subbasin	Impervious (%)	SCS Curve Number
1	20	78
2	18	80
3	52	85
4	55	85
5	60	90

Problem

Rain gage data are given in Table (a) for three rain gages within the watershed. Weight the gage data over the five subareas according to the weighting values given in Table (b) (see Example 1-3 in Chapter 1). Set up the meteorological model for subareas 1 through 5 in the watershed to reference this storm’s rainfall data. For example, subbasin 2 receives 1/3 of gage 100R rainfall and 2/3 of gage 200R rainfall. Enter the actual rain gage data and weights into HEC-HMS.

Table (a) Cumulative Rainfall Data

Time (hr)	Gage Numbers
Time (hr)	100R	200R	300R
0	0.0	0.0	0.0
1	0.60	0.50	0.30
2	1 .03	1.10	0.93
3	1.06	1.10	0.95
4	1 .29	1.20	1.05
5	1.94	1.40	1.13
6	4.18	2.50	1.38
7	4.32	2.90	1.88
8	4.38	3.00	1.96
9	4.54	3.10	2.25
10	4.70	3.20	2.36
11	4.76	3.40	2.58
12	4.84	3.50	2.65
13	4.88	3.50	2.69
14	4.90	3.50	2.71