The Study on Master Plan on Renewable Water Resources Development in the Southwest Region in the Kingdom of Saudi Arabia N Makkah Al-Baha Asir Najran Jazan B408 J404 Legend Run-off Station (MOWE) 0 25 50 km Figure1-9 Runoff Stations in Al Baha Region YACHIYO ENGINEERING CO., LTD. Final Report(Supporting Report(B)) SANYU CONSULTANTS INC. SP-B-19 The Study on Master Plan on Renewable Water Resources Development in the Southwest Region in the Kingdom of Saudi Arabia N B406 B405 Makkah B410 Al-Baha B402 Asir Najran B404 Jazan SA003 SA411 SA404 A403 A404 A40５ A402 A406 A407 A401 SA414 Legend Run-off Station (MOWE) 0 25 50 km Figure1-10 Runoff Stations in Asir Region YACHIYO ENGINEERING CO., LTD. Final Report(Supporting Report(B)) SANYU CONSULTANTS INC. SP-B-20 The Study on Master Plan on Renewable Water Resources Development in the Southwest Region in the Kingdom of Saudi Arabia N Makkah Al-Baha Asir Najran Jazan SA415 SA417 SA418 SA421 0 25 50 km Legend : Run-off Station (MOWE) Figure1-11 Runoff Stations in Jazan Region YACHIYO ENGINEERING CO., LTD. Final Report(Supporting Report(B)) SANYU CONSULTANTS INC. SP-B-21 The Study on Master Plan on Renewable Water Resources Development in the Southwest Region in the Kingdom of Saudi Arabia N Makkah Al-Baha Asir Najran Jazan N401 Najran Legend Run-off Station (MOWE) 0 25 50 km Figure1-12 Runoff Stations in Najran Region 2. Hydrological Characteristics 2.1 Rainfall Characteristics in the Study Area Figure2-1 shows the isohyetal map of the study area using the mean annual rainfall data. The change over the years and the distribution of monthly rainfall are arranged and shown in Figure2-3 based on the rainfall data of rainfall stations shown in Figure2-2. The rainfall characteristics in the study area is summarized below with reference to the figure. • There is a lot of rain in Hijaz Asir Highland with over 200 mm, even to 400 mm or 500 mm in mean annual rainfall. • Except Hijaz Asir Highland and the surrounding area, there is 200 mm below in mean annual rainfall. • There is a little rain with 50 mm below in a northeastern part, facing the Red Sea, in Makkah Region, a eastern part of Asir Region and most of Najran Region especially. • As mentioned above, the annual rainfall of the study area except Hijaz Asir Highland and the surrounding area is 50 mm below or 50 mm to 100 mm, which is equal to the annual rainfall in Riyadh as the capital of KSA. (seer to the figure below) • Most of the study area has a lot of rain through October into May and a little rain through June into July, but on the other hand, Jazan Region has a lot of rain through July into September and a little through December into February. YACHIYO ENGINEERING CO., LTD. Final Report(Supporting Report(B)) SANYU CONSULTANTS INC. SP-B-22 The Study on Master Plan on Renewable Water Resources Development in the Southwest Region in the Kingdom of Saudi Arabia Riyadh Rainfall (mm) Rainfall (mm) Rainfall (mm) 100.0 500 500 450 450 400 400 80.0 350 350 300 300 60.0 250 250 5-year running mean 200 200 40.0 150 150 100 100 20.0 50 50 0 0 0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 Mean Monthly Rainfall at R001 (Riyadh) Tendency of Yearly Rainfall at R001 (Riyadh) Sources:MOWE Change Over Years and Monthly Rainfall Distribution in Riyadh Figure2-1 Isohyetal Map in the Study Area YACHIYO ENGINEERING CO., LTD. Final Report(Supporting Report(B)) SANYU CONSULTANTS INC. SP-B-23 The Study on Master Plan on Renewable Water Resources Development in the Southwest Region in the Kingdom of Saudi Arabia RainfallRainfall (mm) (mm) RainfallRainfall (mm) (mm) 500 500 500 500 N 450 450 450 450 400 400 400 400 350 350 350 350 300 300 300 300 250 250 250 5-year5-year runningrunning mean mean 250 200 200 200 200 150 150 J140 150 150 100 100 100 50 50 100 J220 50 0 0 50 9 3 6 0 77 988 91 001 03 0 1969 1972 1974 19 197 1984 1986 1 19 199 1996 1998 2 20 200 9 0 2 3 4 5 7 8 9 82 84 85 86 87 2 3 5 6 7 8 0 1 2 03 05 06 196 197 197 197 197 197 197 197 197 19 19 19 19 19 1988 1990 1991 199 199 199 199 199 199 200 200 200 20 20 20 TendencyTendency of of Yearly Yearly RainfallRainfall at J140at J140 TA250 Jeddah Makkah Region B111 Al Baha J107 Al Baha Region B004 Legend Rainfall Station (MOWE) J001 B006 B007 Asir Region SA142 A107 RainfallRainfall (mm) (mm) RainfallRainfall (mm)(mm) 500 500 500500 450 450 450450 A121 400 400 400400 Najran Region 350 350 350350 5-year running running mean mean 300 300 300 300 250 250 SA415 250 250 200 200 200 200 150 150 150 150 Jazan Region 100 100 100 100 50 50 SA002 50 50 0 0 0 0 9 9 0 968 97 972 976 978 980 987 98 997 99 001 004 006 8 1 1 1 1974 1 1 1 0 1982 1985 1 1 1991 11993 1 1 2 2 2 4 6 8 0 SA101 196 1970 1972 1974 1976 1978 19 1982 1985 1987 1989 199 1993 1997 1999 2001 200 20 Jizan TendencyTendency of ofYearly Yearly Rainfall Rainfall at A107 at A107 SA137 RainfallRainfall (mm) (mm) RainfallRainfall (mm)(mm) 0 50 100 km 500 500 500500 450 450 450450 400 400 400400 350 350 350350 300 300 300300 250 250 250 250 200 200 200 5-year running mean 200 150 5-year running mean 150 150 150 100 100 100 100 50 50 50 50 0 0 0 0 67 69 71 73 77 79 83 85 91 92 94 96 00 02 05 9 9 9 9 ,9 9 ,9 0 0 1, 1, 1,9 1,9 1,975 1, 1, 1 1,9 1,987 1,989 1, 1 1,9 1,9 2,0 2, 2, 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1991 1992 1993 1994 1995 1996 1997 2000 2001 2002 2004 2005 TendencyTendency of ofYearly Yearly Rainfall Rainfall at SA137 at SA137 Figure2-2 Typical Rainfall Stations in the Study Area YACHIYO ENGINEERING CO., LTD. Final Report(Supporting Report(B)) SANYU CONSULTANTS INC. SP-B-24 The Study on Master Plan on Renewable Water Resources Development in the Southwest Region in the Kingdom of Saudi Arabia Rainfall (mm) Rainfall (mm) Rainfall (mm) 500 500 100.0 450 450 400 400 80.0 350 350 300 300 60.0 250 5-year running mean 250 200 200 40.0 150 150 100 100 20.0 50 50 0 0 0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 9 2 4 6 8 1 1 3 6 6 7 973 7 975 978 984 8 8 990 9 992 995 998 0 0 005 0 19 1970 19 1 19 1 1977 1 1979 1982 1 1985 19 1987 19 1 19 1 1993 1 1996 1997 1 2000 20 2002 20 2 20 Tendency of Yearly Rainfall at J140 Mean Monthly Rainfall at J140 Rainfall (mm) Rainfall (mm) Rainfall (mm) 500 500 100.0 450 450 400 400 80.0 350 350 300 300 60.0 250 5-year running mean 250 200 200 40.0 150 150 100 100 20.0 50 50 0 0 0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1997 1998 1999 2000 2001 2003 2004 Tendency of Yearly Rainfall at J220 Mean Monthly Rainfall at J220 Rainfall (mm) Rainfall (mm) Rainfall (mm) 500 500 100.0 450 450 400 400 80.0 350 350 300 300 60.0 5-year running mean 250 250 200 200 40.0 150 150 100 100 20.0 50 50 0 0 0.0 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 2001 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Tendency of Yearly Rainfall at TA250 Mean Monthly Rainfall at TA250 Sources:MOWE Figure2-3(1) Change Over Years and Monthly Rainfall Distribution in Northern Part Rainfall (mm) Rainfall (mm) Rainfall (mm) 500.0 500 100.0 450.0 450 400.0 400 80.0 350.0 350 300.0 300 60.0 250.0 250 200.0 200 40.0 5-year running mean 150.0 150 100.0 100 20.0 50.0 50 0.0 0 0.0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1981 1982 1986 1987 1989 1990 1992 1994 1995 1996 1997 1998 1999 2000 2002 2003 2004 2005 Tendency of Yearly Rainfall at J107 Mean Monthly Rainfall at J107 Rainfall (mm) Rainfall (mm) Rainfall (mm) 500.0 500 100.0 450.0 450 400.0 400 80.0 350.0 350 300.0 300 60.0 250.0 250 5-year running mean 200.0 200 40.0 150.0 150 100.0 100 20.0 50.0 50 0.0 0 0.0 2 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 74 76 77 79 81 86 88 95 97 1970 1971 197 1973 19 1975 19 19 1978 19 1980 19 1982 1983 1984 1985 19 1987 19 1994 19 19 1998 Tendency of Yearly Rainfall at J001 Mean Monthly Rainfall at J001 Rainfall (mm) Rainfall (mm) Rainfall (mm) 500 500 100.0 450 450 400 400 80.0 350 350 5-year running mean 300 300 60.0 250 250 200 200 40.0 150 150 100 100 20.0 50 50 0 0 0.0 1 3 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC 66 77 79 81 83 85 87 89 9 9 95 97 05 19 1971 1973 1975 19 19 19 19 19 19 19 19 19 19 19 1999 2001 2003 20 Tendency of Yearly Rainfall at SA142 Mean Monthly Rainfall at SA142 Sources:MOWE Figure2-3(2) Change Over Years and Monthly Rainfall Distribution in Western Part YACHIYO ENGINEERING CO., LTD.