T1=6 hrs	T2=2 hrs	D=2.0 (cm)
Time (hr)	Q(m^3/s)	Qb(m^3/s)	(Q-Qb)	u(6,t)	S(t)/T1	S(t)	T2*u(2,t)	u(2,t)
0	18	18	0	0.0	0.0	0	0	0.0
2	21	20	1	0.5	0.5	3	3	1.5
4	28	25	3	1.5	1.5	9	6	3.0
6	44	32	12	6.0	6.0	36	27	13.5
8	70	40	30	15.0	15.5	93	57	28.5
10	118	47	71	35.5	37.0	222	129	64.5
12	228	54	174	87.0	93.0	558	336	168.0
14	342	61	281	140.5	156.0	936	378	189.0
16	413	68	345	172.5	209.5	1257	321	160.5
18	393	75	318	159.0	252.0	1512	255	127.5
20	334	79	255	127.5	283.5	1701	189	94.5
22	270	77	193	96.5	306.0	1836	135	67.5
24	216	73	143	71.5	323.5	1941	105	52.5
26	171	69	102	51.0	334.5	2007	66	33.0
28	138	66	72	36.0	342.0	2052	45	22.5
30	113	63	50	25.0	348.5	2091	39	19.5
32	97	60	37	18.5	353.0	2118	27	13.5
34	84	57	27	13.5	355.5	2133	15	7.5
36	75	55	20	10.0	358.5	2151	18	9.0
38	66	52	14	7.0	360.0	2160	9	4.5
40	59	49	10	5.0	360.5	2163	3	1.5
42	54	47	7	3.5	362.0	2172	9	4.5
44	49	44	5	2.5	362.5	2175	3	1.5
46	46	42	4	2.0	362.5	2175	0	0.0
48	42	40	2	1.0	363.0	2178	3	1.5
50	40	38	2	1.0	363.5	2181	3	1.5
52	38	37	1	0.5	363.0	2178	-3	-1.5
54	36	35	1	0.5	363.5	2181	3	1.5
56	34	34	0	0.0	363.5	2181	0	0.0
58	33	33	0	0.0	363.0	2178	-3	-1.5
60	33	33	0	0.0	363.5	2181	3	1.5
Sum:	3703	1523	2180	1090.0		48759	2181	1090.5

Note:

1. u(6,T)=(Q-Q_b)/D, where D is the effective rainfall depth (cm).

2. the unit step response function, or S-hydrograph, is defined as S(t)=T[u(T,t)+u(T,t-T)+u(T,t-2T)+…]

3. the unit pulse response function u(T,t) is related to S(t) by u(T,t)=[S(t)-S(t-T)]/T

4. The comparsion between U(6,t) and U(2,t)