Assessment of Rainfall Intensity Equations Enlisted in the Egyptian Code for Designing Potable Water and Sewage Networks

Table 6

Comparison of rainfall intensity (mm/hr) for various storm durationsfor Cairo, Alexandria, and Hurghada for the 10-year return period.

Duration (min)	Cairo 10 yr (mm/hr)			Alexandria 10 yr (mm/hr)			Hurghada 10 yr (mm/hr)
	Actual IDF	Proposed Eq.	Code Eq.	Actual IDF	Proposed Eq.	Code Eq.	Actual IDF	Proposed Eq.	Code Eq.
10	33.62	30.72	30.00	98.30	84.42	37.50	26.45	20.86	37.50
12		29.30	27.27		80.54	34.09		19.90	34.09
15	26.796	27.66	24.00	83.01	76.03	30.00	17.63	18.79	30.00
18		26.39	21.43		72.54	26.79		17.92	26.79
24		22.92	18.18		63.00	22.73		15.57	22.73
30	19.24	19.39	16.00	57.53	53.30	20.00	11.1	13.17	20.00
36		16.92	14.29		46.50	17.86		11.49	17.86
42		15.07	12.9		41.43	16.13		10.24	16.13
48		13.64	11.76		37.48	14.71		9.26	14.71
54		12.49	10.81		34.32	13.51		8.48	13.51
60	11.60	11.54	10.00	36.41	31.72	12.5	7.18	7.84	12.50
66		10.74	9.30		29.53	11.63		7.30	11.63
72		10.07	8.70		27.67	10.87		6.84	10.87
78		9.48	8.16		26.06	10.2		6.44	10.20
84		8.97	7.69		24.65	9.62		6.09	9.62
90		8.52	7.27		23.41	9.09		5.78	9.09
96		8.11	6.90		22.30	8.62		5.51	8.62
102		7.75	6.56		21.31	8.20		5.27	8.20
108		7.43	6.25		20.42	7.81		5.05	7.81
114		7.13	5.97		19.61	7.46		4.85	7.46
120	7.54	6.87	5.71	21.19	18.87	7.14	4.65	4.66	7.14