TABLE 19. Water Balance (in mm) for Tarawa, 1989 and 1990.

MONTH 1989 RAIN POTEN-
TIAL
EVAPORA-
TION (ETp)		 INTER-
CEPTION (EI)		 SOIL
MOIS-
TURE
(SMC1)		 EVAPORA
-TION
FROM
SOIL (ES)		 XCESS=
RAIN-
(EI + ES)		 SOIL
MOIS-
TURE
(SMC2)		 GROSS
RE-
CHARGE
(GWR)		 TRANS-
PIRATION
(TL)		 TOTAL
EVAPORA
-TION
(ETa=EI + ES + TL)		 NET
RECHARGE
[NETR
=(GWR-TL)]		 RECHARGE
RATIO
(NETR:RAIN)
January 6 149 6 30 4 -4 26 0 46 55 -46 -8.34
February 7 143 6 26 2 0 26 0 44 51 -44 -6.30
March 34 156 11 26 13 10 36 0 47 70 -47 -1.37
April 72 144 20 36 18 34 66 4 40 78 -36 -0.50
May 171 141 39 66 45 87 71 82 33 117 49 +0.29
June 12 134 12 71 34 -34 38 0 39 85 -39 -3.21
July 20 136 15 38 10 -5 32 0 39 64 -39 -1.98
August 40 156 22 32 16 2 34 0 43 81 -43 -1.07
September 72 166 23 34 23 26 60 0 46 91 -46 -0.64
Octorber 63 171 26 60 46 -9 51 0 46 118 -46 -0.74
November 235 154 30 51 35 161 75 137 37 110 101 +0.43
December 185 144 51 75 47 87 68 94 30 127 64 +0.35
TOTAL 916 1 795 269 -- 292 -- -- 318 488 1 049 -171 -0.19

TABLE 20. Water Balance (in mm) for Tarawa, 1989 and 1990.

MONTH 1990 RAIN POTEN-
TIAL
EVAPORA-
TION (ETp)		 INTER-
CEPTION (EI)		 SOIL
MOIS-
TURE
(SMC1)		 EVAPORA
-TION
FROM
SOIL (ES)		 XCESS=
RAIN-
(EI + ES)		 SOIL
MOIS-
TURE
(SMC2)		 GROSS
RE-
CHARGE
(GWR)		 TRANS-
PIRATION
(TL)		 TOTAL
EVAPORA
-TION
(ETa=EI + ES + TL)		 NET
RECHARGE
[NETR
=(GWR-TL)]		 RECHARGE
RATIO
(NETR:RAIN)
January 643 149 54 68 47 543 62 549 30 131 518 +0.81
February 187 143 28 62 45 114 66 110 37 110 73 +0.39
March 477 156 57 66 45 374 71 370 32 134 338 +0.71
April 468 144 61 71 42 365 71 365 27 129 399 +0.72
May 144 1 441 41 71 47 56 69 58 32 120 25 +0.18
June 173 134 37 69 41 96 73 92 31 109 69 +0.35
July 171 136 38 73 45 89 66 95 32 114 64 +0.37
August 271 156 52 66 51 168 66 168 33 136 135 +0.50
September 337 166 49 66 56 232 75 223 37 143 186 +0.55
Octorber 19 171 10 75 42 -33 34 8 52 104 -44 -2.28
November 308 154 44 34 42 223 63 194 35 121 159 +0.52
December 407 144 54 63 40 314 71 305 29 122 276 +0.68
TOTAL 3 605 1 795 522 -- 542 -- -- 2 537 407 1 472 2 130 +0.59