Example 1: Storage Volume for Climate Conditions in Bangalore (India)

Table 14.1: Calculation of the storage volume for collecting rainwater for irrigation in Bangalore (India). Precipitation Pre (Muller 1996); Monthly storable precipitation STPm with (14.5) and EVpond = 0; ET0 see Fig. 13.1;

CWRm = ET0 X kc(1 + h) x AqMg X dm

For tomato, mean kC = 1.1; (1 + (;) = 1.05; ACr/AG = 0.9

kc(1 + (i) x Acr/AG = 1.04;

CWRm = 1.04 x ET0 x dm From Table 14.1 can be seen:

STPy = Epos STPm = 164.9 l/m2 year Defy = Eneg STPm = 371.2 l/m2 year

Table 14.1 Data for the calculation of the storage volume in Bangalore (India)

Month	Pre l/m2 month	CV l/m2 month	dm	ET0 l/m2 day	CWRm l/m2 month	STPm l/m2 month	STPm accumulated
Jan	5	4.5	31	2.38	76.7	-72.2	+23.1
Feb	8	7.2	28	2.8	81.4	-74.2	-51.1
Mar	10	9	31	3.35	108	-99	-150.1
Apr	41	37	30	3.3	103	-66	-216.1
May	107	96.3	31	3.3	106.3	-10	-226.1
Jun	74	66.6	30	3.3	103	-36.4	-262.5
Jul	99	89.1	31	3.26	105.1	-16	-278.5
Aug	127	114.3	31	2.9	93.5	+20.8	+ 20.8
Sep	170	153	30	2.34	73	+80	+ 100.8
Oct	150	135	31	2.2	70.9	+64.1	+165.2
Nov	69	62.1	30	2.13	66.5	-4.4	+ 160.8
Dec	10	9	31	2.3	74.2	-65.2	+95.6

Case 2(a): Storage volume per m2 greenhouse area VST = STPy = 165(l/m2) The storage is empty from February until July.

Looking at the accumulated sum of STPm, starting in August, the crop water requirement can be covered for 6 months from August to January by rainwater with a storage volume of 0.165 m3 per m2 greenhouse area.

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