Period

Drop in water level

Withdrawal for water supply

Total lake loss

Cumulative lake loss

Evaporation from pan

Evaporation from lake

Cumulative lake evaporation

(F)

(W)

(F-W)

Σ (F − W)

(P)

mP = P × 0.70

Σ(mP)

(m)

(m)

(m)

(m)

(m)

(m)

(m)

Jan ‘85

0.80

0.60

0.20

0.20

0.15

0.11

0.11

Feb ‘85

0.90

0.68

0.22

0.42

0.19

0.13

0.24

March ‘85

1.00

0.72

0.28

0.70

0.27

0.19

0.43

April ‘85

1.11

0.82

0.29

0.99

0.30

0.21

0.64

May ‘85

1.27

0.93

0.34

1.33

0.35

0.25

0.88

June ‘85

1.29

0.97

0.32

1.65

0.33

0.23

1.11