Streamflow Measurements to Identify Gaining and Losing Stream Reaches, 2006
During seepage investigations discharge measurements are made at several locations along a stream or ditch. These measurements are used to identify where loosing and gaining reaches are located and to determine how diversion and return-flow practices affect stream and ditch flow. Seepage investigations are made during periods of low flow when conditions at any given location in the stream or ditch are relatively constant to minimize the effects that any variability with time might introduce.
Discharge measurements for seepage run of July 19, 2006, Lower Hamakua Ditch Main Weir to Paauilo reservoir, Island of Hawaii
Site number
USGS site ID
Station name
Time of measurement
Discharge (cfs)
Remarks
Measurement team 1
1
200656155345901
L. Hamakua Ditch DS from main weir
14:57-15:21
13.0a
Downstream from main weir
2
200649155344601
L. Hamakua Ditch US from flume 1
8:15-8:41
13.3
Gain 0.30 cfs
3
200651155344001
L. Hamakua Ditch DS from flume 2
9:22-9:45
10.4
Loss 2.90 cfs
4
200643155341001
L. Hamakua Ditch US from flume 3
10:23-10:58
11.1
Gain 0.70 cfs
5
200630155333201
L. Hamakua Ditch DS from flume 5
11:39-12:03
9.00
Loss 2.10 cfs
6
200630155332701
L. Hamakua Ditch DS from flume 6
12:48-13:18
9.77
Gain 0.77 cfs
7
200624155330201
L. Hamakua Ditch US from flume 8
13:53-14-25
8.88
Loss 0.89 cfs
Measurement team 2
8
200620155324801
L. Hamakua Ditch US from flume 10
7:10-7:30
9.82
Gain 0.94 cfs
9
200620155324301
L. Hamakua Ditch DS from flume 10
7:50-8:15
8.96
Loss 0.86 cfs
10
200615155321401
L. Hamakua Ditch DS from flume 11
9:00-9:20
8.88
Loss 0.08 cfs
11
200605155320201
L. Hamakua Ditch DS from flume 12
9:40-10:00
9.82
Loss 0.06 cfs
12
200604155314901
L. Hamakua Ditch US from flume 15
10:30-10:50
8.48
Loss 0.34 cfs
13
200557155312701
L. Hamakua Ditch DS from flume 15
11:10-11:30
9.07
Gain 0.59 cfs
14
200550155305301
L. Hamakua Ditch US from flume 19
11:40-12:00
8.64
Loss 0.43 cfs
Measurement team 3
15
200549155304801
L. Hamakua Ditch DS from flume 19
7:02-7:52
9.27
Gain 0.63 cfs
16
200528155292901
L. Hamakua Ditch DS from M. C. Haul Rd
8:31-9:20
9.09
Loss 0.18 cfs
17
200505155285401
L. Hamakua Ditch US from flume 29
10:20-10:58
8.51
Loss 0.58 cfs
18
200505155284501
L. Hamakua Ditch DS from flume 29
11:35-12:09
7.06
Loss 1.45 cfs
19
200459155281801
L. Hamakua Ditch US from flume 30
13:00-14:00
6.85
Loss 0.21 cfs
20
200456155275401
L. Hamakua Ditch DS from flume 31
14:40-15:13
7.04
Gain 0.19 cfs
Measurement team 4
21
200431155265801
L. Hamakua Ditch US from flume 32
7:10-7:40
6.63
Loss 0.41 cfs
22
200427155263501
L. Hamakua Ditch DS from flume 34
9:20-9:48
6.78
Gain 0.15 cfs
23
200422155262801
L. Hamakua Ditch DS from Paauhau Rd
8:16-8:45
5.83
Loss 0.95 cfs
24
200353155254201
L. Hamakua Ditch DS from flume 37
10:28-10:58
5.57
Loss 0.26 cfs
25
200339155250701
L. Hamakua Ditch US from flume 40
11:30-12:05
4.91
Loss 0.66 cfs
26
200309155241401
L. Hamakua Ditch US from flume 45
13:10-13:35
4.37
Loss 0.54 cfs
27
200256155233801
L. Hamakua Ditch US inlet Paauilo Res
14:01-14:25
3.66
Loss 0.71 cfs
Total reduction in discharge, Main Weir to Paauilo Reservoir 13.0-3.66 = 9.34 cfs a - Average of two discharge measurements
Discharge measurements for seepage run of May 25, 2006, Ukumehame Stream, Maui, Hawaii
Site number
USGS site ID
Station name
Time
Discharge (cfs)
Remarks
1
204854156350501
Ukumehame Gulch upstream of taro div, Maui, HI
09:51-10:33
6.23
405 ft. US of taro diversion
2
204852156350601
Ukumehame taro diversion ditch at intake, Maui, HI
10:44-10:54
0.80
302 ft. US of ditch intake
3
204851156351001
Ukumehame Ditch at intake, Maui, HI
11:14-11:24
0.38
Total diversion of 1.18 cfs
4
204829156352101
Ukumehame Gulch at 100 ft, Maui, HI
12:35-13:10
6.03
Gain of 0.98 cfs
5
204802156353101
Ukumehame Gulch at mouth, Maui, HI
13:48-14:14
5.17
Loss of 0.86 cfs
Discharge measurements for seepage run of September 20, 2006, Ukumehame Stream, Maui, Hawaii
U.S. Department of the Interior |
U.S. Geological Survey