RTK Hydrographs can be specified as part of the subcatchment data and are used to determine RDII (Rainfall Derived Infiltration and Inflow) entering the system.
This method would typically be used to model the extra inflow during and immediately after rainfall events, caused by seepage of rainwater into defective pipes, ill fitting manhole covers etc.
The RTK Hydrograph defines the proportion of the rainfall falling on the subcatchment that enters the system as RDII and the time at which this rainfall enters the system.
If any monthly RDII information is available, then Monthly RTK Hydrographs can be defined in addition to the general RTK Hydrographs. Data in one or more Monthly RTK Hydrographs will override the data in any RTK Hydrograph (with the same ID) for the specified month.
This table describes all the data fields used to define a Monthly RTK Hydrograph object.
Fields that are common to the majority of objects can be found in the Common Fields topic.
RTK Monthly Hydrograph Data
Database Table Name: hw_unit_hydrograph_month
|
Field Name |
Description |
Database Field |
Size |
Precision |
Default |
Error Lower Limit |
Error Upper Limit |
Warning Lower Limit |
Warning Upper Limit |
||
|---|---|---|---|---|---|---|---|---|---|---|---|
|
RTK Hydrograph ID |
The identifier for the RTK hydrograph with which this month is associated. Note: This ID must be the same ID as specified for the
RTK hydrograph. Data specified for the RTK hydrograph will be overwritten with the data specified for this month.
|
ID |
Text |
64 |
|
0 |
|
|
|
|
|
| Month | The month in which the rainfall entered the system. |
ID |
Text |
64 |
|
0 |
|
|
|
|
|
| Response ratio R - short term |
Applicable to short-term rainfall response component of hydrograph for the specified Month. Area under graph representing the proportion of rainfall entering the drainage network. |
R1 |
Double |
|
|
3 |
|
0 |
1 |
|
|
| Time to peak T - short term |
Applicable to short-term rainfall response component of hydrograph for the specified Month. Time from the onset of rainfall to the peak of the triangle of the graph. |
T1 |
Double |
|
RS_HOURS |
3 |
|
0 |
|
|
|
| Recession limb ratio k - short term |
Applicable to short-term rainfall response component of hydrograph for the specified Month. Ratio of 'time to recession' to the 'time to peak' of the graph. |
K1 |
Double |
|
|
3 |
|
0 |
|
|
|
| Response ratio R - medium term |
Applicable to medium-term rainfall response component of hydrograph for the specified Month. Area under graph representing the proportion of rainfall entering the drainage network. |
R2 |
Double |
|
|
3 |
|
0 |
1 |
|
|
| Time to peak T - medium term |
Applicable to medium-term rainfall response component of hydrograph for the specified Month. Time from the onset of rainfall to the peak of the triangle of the graph. |
T2 |
Double |
|
RS_HOURS |
3 |
|
0 |
|
|
|
| Recession limb ratio k - medium term |
Applicable to medium-term rainfall response component of hydrograph for the specified Month. Ratio of 'time to recession' to the 'time to peak' of the graph. |
K2 |
Double |
|
|
3 |
|
0 |
|
|
|
| Response ratio R - long term |
Applicable to long-term rainfall response component of hydrograph for the specified Month. Area under graph representing the proportion of rainfall entering the drainage network. |
R3 |
Double |
|
|
3 |
|
0 |
1 |
|
|
| Time to peak T - long term |
Applicable to long-term rainfall response component of hydrograph for the specified Month. Time from the onset of rainfall to the peak of the triangle of the graph. |
T3 |
Double |
|
RS_HOURS |
3 |
|
0 |
|
|
|
| Recession limb ratio k - long term |
Applicable to long-term rainfall response component of hydrograph for the specified Month. Ratio of 'time to recession' to the 'time to peak' of the graph. |
K3 |
Double |
|
|
3 |
|
0 |
|
|
|
| Max initial abstraction rainfall depth -short term | Maximum initial abstraction rainfall depth for the short-term response for the specified Month. | Dmax1 | Double | RD | 3 | 0 | |||||
| Initial abstraction recovery rate - short term | The abstraction recovery rate for the short-term response for the specified Month. | Drec1 | Double | EV | 3 | 0 | |||||
| Initial abstraction depth - short term | The initial rainfall depth for the short-term response for the specified Month. This value must be less than the specified Max initial abstraction rainfall depth -short term one. | D01 | Double | RD | 3 | 0 | |||||
| Max initial abstraction rainfall depth -medium term | Maximum initial abstraction rainfall depth for the medium-term response for the specified Month. | Dmax2 | Double | RD | 3 | 0 | |||||
| Initial abstraction recovery rate - medium term | The abstraction recovery rate for the medium-term response for the specified Month. | Drec2 | Double | EV | 3 | 0 | |||||
| Initial abstraction depth - medium term | The initial rainfall depth for the medium-term response for the specified month. This value must be less than the specified Max initial abstraction rainfall depth -medium term one. | D02 | Double | RD | 3 | 0 | |||||
| Max initial abstraction rainfall depth -long term | Maximum initial abstraction rainfall depth for the long-term response for the specified Month. | Dmax3 | Double | RD | 3 | 0 | |||||
| Initial abstraction recovery rate - long term | The abstraction recovery rate for the long-term response for the specified Month. | Drec3 | Double | EV | 3 | 0 | |||||
| Initial abstraction depth - long term | The initial rainfall depth for the long-term response for the specified Month. This value must be less than the specified Max initial abstraction rainfall depth -long term one. | D03 | Double | RD | 3 | 0 |