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.
Site
number |
USGS site ID |
Station name |
Time of measurement |
Discharge
(cfs) |
Remarks |
Measurement team 1 |
| |
|
|
7:07-7:38 |
|
|
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 |
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 |
Site
number |
USGS site ID |
Station name |
Time |
Discharge (cfs) |
Remarks |
1 |
16647000 |
Ukumehame Gulch nr Olowalu, Maui, HI |
10:24-10:52 |
3.26 |
2100 ft. US of taro diversion |
2 |
204854156350501 |
Ukumehame Gulch upstream of taro div, Maui, HI |
11:33-12:02 |
3.14 |
280 ft. US of taro diversion |
3 |
204829156352101 |
Ukumehame Gulch at 100 ft, Maui, HI |
13:40-14:02 |
0.91 |
Removal of 2.23 cfs |
4 |
204802156353101 |
Ukumehame Gulch at mouth, Maui, HI |
14:33-14:48 |
0.63 |
Loss of 0.28 cfs |
