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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
1200656155345901L. Hamakua Ditch DS from main weir14:57-15:2113.0aDownstream from main weir
2200649155344601L. Hamakua Ditch US from flume 18:15-8:4113.3Gain 0.30 cfs
3200651155344001L. Hamakua Ditch DS from flume 29:22-9:4510.4Loss 2.90 cfs
4200643155341001L. Hamakua Ditch US from flume 310:23-10:5811.1Gain 0.70 cfs
5200630155333201L. Hamakua Ditch DS from flume 511:39-12:039.00Loss 2.10 cfs
6200630155332701L. Hamakua Ditch DS from flume 612:48-13:189.77Gain 0.77 cfs
7200624155330201L. Hamakua Ditch US from flume 813:53-14-258.88Loss 0.89 cfs
Measurement team 2
8200620155324801L. Hamakua Ditch US from flume 107:10-7:309.82Gain 0.94 cfs
9200620155324301L. Hamakua Ditch DS from flume 107:50-8:158.96Loss 0.86 cfs
10200615155321401L. Hamakua Ditch DS from flume 119:00-9:208.88Loss 0.08 cfs
11200605155320201L. Hamakua Ditch DS from flume 129:40-10:009.82Loss 0.06 cfs
12200604155314901L. Hamakua Ditch US from flume 1510:30-10:508.48Loss 0.34 cfs
13200557155312701L. Hamakua Ditch DS from flume 1511:10-11:309.07Gain 0.59 cfs
14200550155305301L. Hamakua Ditch US from flume 1911:40-12:008.64Loss 0.43 cfs
Measurement team 3
15200549155304801L. Hamakua Ditch DS from flume 197:02-7:529.27Gain 0.63 cfs
16200528155292901L. Hamakua Ditch DS from M. C. Haul Rd 8:31-9:209.09Loss 0.18 cfs
17200505155285401L. Hamakua Ditch US from flume 2910:20-10:588.51Loss 0.58 cfs
18200505155284501L. Hamakua Ditch DS from flume 2911:35-12:097.06Loss 1.45 cfs
19200459155281801L. Hamakua Ditch US from flume 3013:00-14:006.85Loss 0.21 cfs
20200456155275401L. Hamakua Ditch DS from flume 3114:40-15:137.04Gain 0.19 cfs
Measurement team 4
21200431155265801L. Hamakua Ditch US from flume 327:10-7:406.63Loss 0.41 cfs
22200427155263501L. Hamakua Ditch DS from flume 349:20-9:486.78Gain 0.15 cfs
23200422155262801L. Hamakua Ditch DS from Paauhau Rd8:16-8:455.83Loss 0.95 cfs
24200353155254201L. Hamakua Ditch DS from flume 3710:28-10:585.57Loss 0.26 cfs
25200339155250701L. Hamakua Ditch US from flume 4011:30-12:054.91Loss 0.66 cfs
26200309155241401L. Hamakua Ditch US from flume 4513:10-13:354.37Loss 0.54 cfs
27200256155233801L. Hamakua Ditch US inlet Paauilo Res14:01-14:253.66Loss 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
1204854156350501Ukumehame Gulch upstream of taro div, Maui, HI09:51-10:336.23405 ft. US of taro diversion
2204852156350601Ukumehame taro diversion ditch at intake, Maui, HI10:44-10:540.80302 ft. US of ditch intake
3204851156351001Ukumehame Ditch at intake, Maui, HI11:14-11:240.38Total diversion of 1.18 cfs
4204829156352101Ukumehame Gulch at 100 ft, Maui, HI12:35-13:106.03Gain of 0.98 cfs
5204802156353101Ukumehame Gulch at mouth, Maui, HI13:48-14:145.17Loss of 0.86 cfs
Discharge measurements for seepage run of September 20, 2006, Ukumehame Stream, Maui, Hawaii
Site
number
USGS site ID Station name Time Discharge (cfs) Remarks
116647000Ukumehame Gulch nr Olowalu, Maui, HI10:24-10:523.262100 ft. US of taro diversion
2204854156350501Ukumehame Gulch upstream of taro div, Maui, HI11:33-12:023.14280 ft. US of taro diversion
3204829156352101Ukumehame Gulch at 100 ft, Maui, HI13:40-14:020.91Removal of 2.23 cfs
4204802156353101Ukumehame Gulch at mouth, Maui, HI14:33-14:480.63Loss of 0.28 cfs

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