Nigeria - Kainji lake project. A limnological description of Kainji lake, 1969-1971- A report prepared for the Kainji lake research (man-made lake) project

SUMMARY OF SURVEY CRUISES (LIMNOLOGICAL PROGRAMME)

Cruise Number	Date	Boat	Bathythermograph Stations	BT Slide Numbers	Complete Stations	Staff	Remarks
K-4-69	27–28 Aug	16 ft Aluminum	1(2),2,3,4,5,6,7,9	10–16 18–19	2,5,7	Henderson	Extra station between 6 and 7	BT17
K-6-69	7–10 Oct	"	1 through 14	20–25 27–35	1,3,6,8,10,11,13,14	Henderson	"	BT26
K-8-69	20–22 Nov	"	1,3,5,6,7(2),9,11,12,13,14	37–47	1,6,7,9,12	Henderson	-
K-1-70	14–16 Jan	16 ft Whaler	1.3,5,6,7,9,13	53–59	3,6,9,13	Henderson Adeniji	Engine break - down prevented completion
K-3-70	14–17 Feb	"	1,3,5,6,7(4),8,9,11,12,13,14,15	60–61 64–66 68–79	1,3,5,6,7(2),8,9,11,12,13,14	Henderson	Includes special stations for co-operative programme with Imevbore, Univ. of Ife	BT62 63 65 67
K-4-70	16–17 March	"	1,3,5,6,7(2),8,9,11,12,13,14	80–91	1,6,9,11,12,13,14	Henderson Adeniji	-
K-6-70	21–22 April	"	1,3,5,6,7(2),9,11,12,13,14	94–100 105	1,6,7,9,11,12,13,14	Henderson Adeniji	-
K-7-70	3–11 June	“	1,3,7,9,11,12,13,14	106–113	1,3,7,11,12,13,14	Adeniji
K-8-70	22–24 July	31 ft Houseboat	1(2),3,5,6(2),7,9,11,12,13,15	114–125	1,3,6,7,9,11,12,13	Henderson Adeniji	-
K-10-70	13–15 Oct	31 ft Houseboat	1(2),3(2),5,6,7(3),9,11,12,13,14,15	138–147 149–153	1,3,6,7,9,11,12,13,14,15	Henderson Adeniji Karlman	No BT148
K-12-70	1–3 Dec	"	1(2),3(2),6,7(2),8,9,11,12,13,14	153–163 165–166	1(2),3,6,7,9,11,12,13,14	Adeniji Karlman	No BT164
K-1-71	14–15 Jan	31 ft Houseboat	1,3,6,7(3),9,11,12,13,14,15	167–178	1,3,6,7,9,11,12,13,14,15	Henderson Adeniji	-
K-2-71	3–5 Mar	"	1,3,6,7(3),9,11,12,13,14	179–189	1.3,6,7,9,11,12,13,14	Adeniji	-
K-3-71	15–16 Apr	"	1,3,6,7,9,11,12,13	192–199	1,3,6,7,9,11,12,13	Adeniji	-

Table 2

HYPSOGRAPHIC CHART FOR KAINJI LAKE

Height of Upper Surface (m above M/s/l)	Lake Volume (m³ × 10⁹)	Area of 1-m Stratum (m² × 10⁹)
142	15.6	1.30
141	14.4	1.24
140	13.2	1.17
139	12.0	1.11
138	10.9	1.05
137	9.9	,99
136	8.85	.92
135	7.95	.86
134	7.10	.78
133	6.30	.73
132	5.60	.67
131	4.90	.63
130	4.3	.58
129	3.7	.53
128	3.25	.48
127	2.75	.43
126	2.3	.39
125	1.9	.35
124	1.55	.31
123	1.25	.26
122	1.0	.22
121	.85	.18
120	.7	.14
119	.6	.09
118	.5	.07
117	.4	.05
116	.35	.04
115	.30	.03
114	.25	.02
113	.2	.01
112	.1	.005
111	.05	-
110	-	-

Table 3

ANALYTICAL HEAT BUDGET FOR KAINJI LAKE 1970

	Jan	Feb	Mar	Apr	May	Jun	Jul	Aug	Sep	Oct	Nov	Dec	Units

	RADIATION
Net Solar	444	447	523	454	493	519	410	388	429	483	459	469	ly/da
Outgoing Longwave	102	87	78	44	86	105	77	77	84	105	130	144	ly/da
Radiation “Balance”	342	360	445	410	407	414	333	311	345	378	329	325	ly/da

	ADVECTION
Inflow	-24	-6	16	6	2	1	0	-1	0	-2	-9	-24	ly/da
Turbines	2	8	76	9	8	3	0	4	4	+ 1	+2	0	ly/da
Spillway	8	15	37	11	1	-1	-2	6	2	+ 1	0	-1	ly/da
Total Advective Gain	-14	17	60	26	11	3	-2	9	6	0	-7	-25	ly/da

	EVAPORATION AND CONVECTION
Bowen Ratio	-0.077	-0.021	-0.044	-0.097	-0.032	0.070	0.064	0.075	0.090	0.058	0.056	0.007
Convection Loss	-30	-8	-20	-43	13	29	22	22	28	21	19	3	ly/da
Evaporative Loss	387	366	453	444	401	414	340	299	313	357	331	389	ly/da
Evaporation Calc.	20.6	17.6	24.3	23.0	21.5	21.4	18.2	16.0	16.2	19.1	17.2	20.7	cm/mo
Total Loss at Surface	357	358	433	401	414	443	362	321	341	378	350	392

	STORAGE
Storage	-29	19	72	35	4	-26	-31	-19	10	0	-28	-92	ly/da
Mean Temperature of Lake	26.7	26.5	27.8	29.0	29.6	29.3	28.6	27.9	27.7	27.8	27.4	25.9	°C