The Study of Subsurface Land Drainage Optimal Design Model

Table 1

General climate and crops indicators for the study area.

Factor	Month	1	2	3	4	5	6	7	8	9	10	11	12	The average annual
Temperature		7.3	9.1	12.5	16.4	21	25.9	27.9	28.1	24.5	19.1	13.4	8.6	17.8
Rainfall (mm)	%	18.7	14.1	13.3	8.6	3.2	0.7	0	0.2	1.6	8.6	8.5	22.2	99.7
	Monthly rate	121	91.6	84.9	55.9	21.2	4.8	0	1.9	10.6	54.9	54.9	145.6	649
Evaporation from free water surface (mm/day)	Lambert	1.2	1.7	2.4	2.6	5.7	7.9	10.5	9.5	6.5	3.8	1.4	1.1	4.8
	Ivanov	1.1	1.6	2.5	3.9	5.6	8.4	9.3	8.7	7.3	4.5	2.5	1.2	4.7
Evatranspiration (mm/day)		0.7	1.8	2.5	4.4	6.6	8.4	8.9	8.9	6.1	3.2	2	0.7	4.56
Crop needs (mm/month)	Wheat and barley	15.19	35.28	54.25	92.4	0	0	0	0	0	0	42	15.19	21.25
	Cotton	0	35.28	54.25	92.4	143.22	176.4	193.13	193.13	0	0	0	0	73.98
	Summer vegetables	0	35.28	54.25	92.4	143.22	176.4	193.13	0	0	0	0	0	57.89