# 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.

Updated: June 30, 2015 — 4:25 am